Jwst launches in less than 3 hours

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

What question, specifically, did you ask?

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

What question, specifically, did you ask?

Just details of the one month orbit around Earth between moving Earth to moving L2. As both Earth and L2 orbits the Sun, it is quite difficult to start from one moving planet Earth with a great mass to another moving zero mass point L2, and I simply wonder how it is done. It seems nobody at ESA/NASA knows.

Just details of the one month orbit around Earth between moving Earth to moving L2. As both Earth and L2 orbits the Sun, it is quite difficult to start from one moving planet Earth with a great mass to another moving zero mass point L2, and I simply wonder how it is done. It seems nobody at ESA/NASA knows.

Ah, so because you didn't get an answer, they must not know.  It doesn't matter that they likely get large quantities of questions, so answering them all would be impossible.

Nope, doesn't matter, because ego dictates that your question is of profound importance and should clearly be at the top of the list of questions demanding an answer.

Lagrangian points naturally capture objects. This can be evidenced by the trojan objects orbiting Jupiter's L4 and L5 points, and asteroids in obit around the Earth/Sun L4 and L5 points.  If it can happen naturally, then it ought to be possible technologically.

If a man made object approaches a Lagrangian point at the right speed and trajectory then it will be captured the same way a natural object would. Calculating the necessary speed and trajectory is indeed difficult, but not impossible.  That you do not understand the necessary equations (and to be fair, neither do I fully) does not render it impossible.

Quote from: Heiwa on January 28, 2022, 03:06:17 AM

Just details of the one month orbit around Earth between moving Earth to moving L2. As both Earth and L2 orbits the Sun, it is quite difficult to start from one moving planet Earth with a great mass to another moving zero mass point L2, and I simply wonder how it is done. It seems nobody at ESA/NASA knows.

Ah, so because you didn't get an answer, they must not know.  It doesn't matter that they likely get large quantities of questions, so answering them all would be impossible.

Nope, doesn't matter, because ego dictates that your question is of profound importance and should clearly be at the top of the list of questions demanding an answer.

He's also avoided posting exactly what he asked despite being asked multiple times. This is either because he didn't really ask and this is just another of his lies, or the way he asked makes it clear he was a crackpot.

Quote from: Heiwa on January 28, 2022, 03:06:17 AM

Just details of the one month orbit around Earth between moving Earth to moving L2. As both Earth and L2 orbits the Sun, it is quite difficult to start from one moving planet Earth with a great mass to another moving zero mass point L2, and I simply wonder how it is done. It seems nobody at ESA/NASA knows.

Ah, so because you didn't get an answer, they must not know.  It doesn't matter that they likely get large quantities of questions, so answering them all would be impossible.

Nope, doesn't matter, because ego dictates that your question is of profound importance and should clearly be at the top of the list of questions demanding an answer.

Lagrangian points naturally capture objects. This can be evidenced by the trojan objects orbiting Jupiter's L4 and L5 points, and asteroids in obit around the Earth/Sun L4 and L5 points.  If it can happen naturally, then it ought to be possible technologically.

If a man made object approaches a Lagrangian point at the right speed and trajectory then it will be captured the same way a natural object would. Calculating the necessary speed and trajectory is indeed difficult, but not impossible.  That you do not understand the necessary equations (and to be fair, neither do I fully) does not render it impossible.

Yes, ESA/NASA hasn't got a clue about space travel and orbits.
No, Lagrangian points do not capture anything. It only happens that gravity forces  of adjacent bodies are zero there and cannot attract anything.
Lagrangian points are not fixed in space and move all the times due to all celestial bodies move all the time. No man made object can ever find a Lagrangian point in space. Thanks for telling me you you don't understand how to do it.

Quote from: Curiouser and Curiouser on January 27, 2022, 07:03:46 PM

I suggest that you are a bored and boring troll. You can provide no evidence to the contrary.

I am not bored at all. I look out of my windows and watch the Mediterranean Sea below and the objects in the sky above and the horizon in between. That the JWST elliptically orbits Earth governed by gravity forces, I can see, but it in a fixed plane relative Earth, i.e. it doesn't wobble around in its trajectory ... around Earth or L2 as suggested by others. Does ESA/NASA really know what an "orbit" is? An orbit is the curved path of a celestial object or spacecraft round a star, planet, or moon in a fixed plane, and with a periodic, elliptical revolution.

You have provided no evidence that you are not bored. And you are most certainly boring.

And the idea that you are an expert in orbits, and that two organizations with roughly 20,000 people and $30B have been deluded or mistaken simply because you can’t imagine how something works is laughable. And boring.

I agree with Heiwa, how do you squeeze a telescope up in between all those planets?

I admit, it looks awfully crowded up there...

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot! So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Just look out of your own window and observe what I do! It is a much better location than an orbit around moving point L2 that needs adjustments all the time.
As we all know the dynamical region about the SEMB L2 point is inherently unstable. As such, routine station-
keeping maneuvers are necessary to keep the JWST observatory with its trim flap (ROTFL) and thrusters in a science orbit for the desired 10.5-year mission lifetime. It is not necessary from my window. No trim flap required.

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

Quote from: Stash on January 28, 2022, 10:20:58 PM

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Just look out of your own window and observe what I do! It is a much better location than an orbit around moving point L2 that needs adjustments all the time.
As we all know the dynamical region about the SEMB L2 point is inherently unstable. As such, routine station-
keeping maneuvers are necessary to keep the JWST observatory with its trim flap (ROTFL) and thrusters in a science orbit for the desired 10.5-year mission lifetime. It is not necessary from my window. No trim flap required.

Just because you think you can see everything in the cosmos from your window doesn't mean that other more learned folks can't devise ways to see better. Would you say that about glasses? As in, "Oh, I can see just fine even though things are blurry farther away, no need for glasses..." Are you anti-glasses, anti-cameras, anti-microscopes, anti-telescopes? What kind of drugs are you on?

I mean why did you propose a new design for tankers? To make them "better", right? Why do you think advancing technology only applies to ship building and nothing else? Do ship builders/designers just look out their window at passing tankers and say, "Improving on that is not necessary based on the view from my window..."? Is that how you go about engineering, just looking out your window? Could you be lazier?

What is wrong with you?

Quote from: Heiwa on January 28, 2022, 10:43:53 PM

Quote from: Stash on January 28, 2022, 10:20:58 PM

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Just look out of your own window and observe what I do! It is a much better location than an orbit around moving point L2 that needs adjustments all the time.
As we all know the dynamical region about the SEMB L2 point is inherently unstable. As such, routine station-
keeping maneuvers are necessary to keep the JWST observatory with its trim flap (ROTFL) and thrusters in a science orbit for the desired 10.5-year mission lifetime. It is not necessary from my window. No trim flap required.

Just because you think you can see everything in the cosmos from your window doesn't mean that other more learned folks can't devise ways to see better. Would you say that about glasses? As in, "Oh, I can see just fine even though things are blurry farther away, no need for glasses..." Are you anti-glasses, anti-cameras, anti-microscopes, anti-telescopes? What kind of drugs are you on?

I mean why did you propose a new design for tankers? To make them "better", right? Why do you think advancing technology only applies to ship building and nothing else? Do ship builders/designers just look out their window at passing tankers and say, "Improving on that is not necessary based on the view from my window..."? Is that how you go about engineering, just looking out your window? Could you be lazier?

What is wrong with you?

Nothing is wrong with me. I just tested negative with regard to Covid for the 4th time! Re oil tankers United Nations asked 1990 for better, safer, designs spilling less oil and I made a proposal that was approved and accepted 1997. The next day some clown (a US admiral) told United nations that my design was not allowed in USA!

Quote from: Stash on January 28, 2022, 11:56:08 PM

Quote from: Heiwa on January 28, 2022, 10:43:53 PM

Quote from: Stash on January 28, 2022, 10:20:58 PM

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Just look out of your own window and observe what I do! It is a much better location than an orbit around moving point L2 that needs adjustments all the time.
As we all know the dynamical region about the SEMB L2 point is inherently unstable. As such, routine station-
keeping maneuvers are necessary to keep the JWST observatory with its trim flap (ROTFL) and thrusters in a science orbit for the desired 10.5-year mission lifetime. It is not necessary from my window. No trim flap required.

Just because you think you can see everything in the cosmos from your window doesn't mean that other more learned folks can't devise ways to see better. Would you say that about glasses? As in, "Oh, I can see just fine even though things are blurry farther away, no need for glasses..." Are you anti-glasses, anti-cameras, anti-microscopes, anti-telescopes? What kind of drugs are you on?

I mean why did you propose a new design for tankers? To make them "better", right? Why do you think advancing technology only applies to ship building and nothing else? Do ship builders/designers just look out their window at passing tankers and say, "Improving on that is not necessary based on the view from my window..."? Is that how you go about engineering, just looking out your window? Could you be lazier?

What is wrong with you?

Nothing is wrong with me. I just tested negative with regard to Covid for the 4th time! Re oil tankers United Nations asked 1990 for better, safer, designs spilling less oil and I made a proposal that was approved and accepted 1997. The next day some clown (a US admiral) told United nations that my design was not allowed in USA!

And the reason why it was rejected was because your design was based upon nothing more than you looking out your window.

Quote from: Heiwa on January 29, 2022, 12:13:33 AM

Quote from: Stash on January 28, 2022, 11:56:08 PM

Quote from: Heiwa on January 28, 2022, 10:43:53 PM

Quote from: Stash on January 28, 2022, 10:20:58 PM

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

Quote from: boydster on January 28, 2022, 11:05:10 AM

Quote from: JJA on January 28, 2022, 09:36:04 AM

Quote from: Heiwa on January 28, 2022, 01:05:04 AM

Question is if ESA/NASA knows what an orbit is. I have asked them about the orbit Earth/L2 and they cannot provide it.

Sure you did.

And let me guess, you can't provide us with a copy of the message you claim to have sent them.

Just more repeated trolling.  You need new material.   

The real problem is, they blocked his email address long, long ago. Back when he was demanding they provide him info about how the heat shields were constructed for the old shuttle.

http://heiwaco.com/moontraveld.htm explains a lot!

This actually explains stuff along with supporting calculations. No rants from a madman 'Danger at Sea' ship plumber involved. Just science and physics...

L2 STATION KEEPING MANEUVER STRATEGY FOR THE JAMES WEBB SPACE TELESCOPE

Quote from: Heiwa on January 28, 2022, 04:26:05 PM

So the L2 point orbits both the Sun and the Earth at high speed and the JWST orbits the L2 point at a certain speed so the JWST is moving all the time. It is not a good location to observe the Universe. Better is from my window. I can do it any time.

You saying your location of viewing the universe is better from your window than a telescope beyond our atmosphere speaks volumes as to just how ignorant you are. How would you even know it's better? What are you basing that on?

Why won't you show us an image of the cosmos from your window and describe what you've gleaned from it? Show us how it's better than, let's say hubble, let alone JWST.

Just look out of your own window and observe what I do! It is a much better location than an orbit around moving point L2 that needs adjustments all the time.
As we all know the dynamical region about the SEMB L2 point is inherently unstable. As such, routine station-
keeping maneuvers are necessary to keep the JWST observatory with its trim flap (ROTFL) and thrusters in a science orbit for the desired 10.5-year mission lifetime. It is not necessary from my window. No trim flap required.

Just because you think you can see everything in the cosmos from your window doesn't mean that other more learned folks can't devise ways to see better. Would you say that about glasses? As in, "Oh, I can see just fine even though things are blurry farther away, no need for glasses..." Are you anti-glasses, anti-cameras, anti-microscopes, anti-telescopes? What kind of drugs are you on?

I mean why did you propose a new design for tankers? To make them "better", right? Why do you think advancing technology only applies to ship building and nothing else? Do ship builders/designers just look out their window at passing tankers and say, "Improving on that is not necessary based on the view from my window..."? Is that how you go about engineering, just looking out your window? Could you be lazier?

What is wrong with you?

Nothing is wrong with me. I just tested negative with regard to Covid for the 4th time! Re oil tankers United Nations asked 1990 for better, safer, designs spilling less oil and I made a proposal that was approved and accepted 1997. The next day some clown (a US admiral) told United nations that my design was not allowed in USA!

And the reason why it was rejected was because your design was based upon nothing more than you looking out your window.

No, US interests wanted to buy the patents of the concept and were turned down.

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

It would indeed be silly for a spacecraft to have a trim flap like boats or planes have.

Luckily the JWST has an aft momentum flap like spacecraft have.

You can read all about it on my website, janeyouignorantjwst.com

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

Apparently   

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

Quote from: Stash on January 29, 2022, 06:40:17 PM

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

How do you know it was “retracted”?  It’s just not there. It’s from a course given at the institute 8 years ago.

In any case, 1 down, 23 more to go. Let us know when you’ve completed your reading.

Quote from: Heiwa on January 29, 2022, 06:49:33 PM

Quote from: Stash on January 29, 2022, 06:40:17 PM

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

How do you know it was “retracted”?  It’s just not there. It’s from a course given at the institute 8 years ago.

In any case, 1 down, 23 more to go. Let us know when you’ve completed your reading.

You asked me to have a look of your evidence that a a trim/momentum flap is required to steer a space craft and there was none. Pls copy [14] L. Janes know and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006, about a trim/momentum flap a trim/momentum flap for station keeping. I know the location of the L2 point but not its speed through the Universe but I am curious to find out how a trim flap will keep me in location, when I am blown away by a solar wind of unknown force.

Quote from: Stash on January 29, 2022, 09:54:40 PM

Quote from: Heiwa on January 29, 2022, 06:49:33 PM

Quote from: Stash on January 29, 2022, 06:40:17 PM

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

How do you know it was “retracted”?  It’s just not there. It’s from a course given at the institute 8 years ago.

In any case, 1 down, 23 more to go. Let us know when you’ve completed your reading.

You asked me to have a look of your evidence that a a trim/momentum flap is required to steer a space craft and there was none. Pls copy [14] L. Janes know and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006, about a trim/momentum flap a trim/momentum flap for station keeping. I know the location of the L2 point but not its speed through the Universe but I am curious to find out how a trim flap will keep me in location, when I am blown away by a solar wind of unknown force.

Keep reading.

Quote from: Heiwa on January 29, 2022, 11:51:41 PM

Quote from: Stash on January 29, 2022, 09:54:40 PM

Quote from: Heiwa on January 29, 2022, 06:49:33 PM

Quote from: Stash on January 29, 2022, 06:40:17 PM

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

How do you know it was “retracted”?  It’s just not there. It’s from a course given at the institute 8 years ago.

In any case, 1 down, 23 more to go. Let us know when you’ve completed your reading.

You asked me to have a look of your evidence that a a trim/momentum flap is required to steer a space craft and there was none. Pls copy [14] L. Janes know and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006, about a trim/momentum flap a trim/momentum flap for station keeping. I know the location of the L2 point but not its speed through the Universe but I am curious to find out how a trim flap will keep me in location, when I am blown away by a solar wind of unknown force.

Keep reading.

Have you sent [14] so I can read it?

Quote from: Stash on January 30, 2022, 12:06:32 AM

Quote from: Heiwa on January 29, 2022, 11:51:41 PM

Quote from: Stash on January 29, 2022, 09:54:40 PM

Quote from: Heiwa on January 29, 2022, 06:49:33 PM

Quote from: Stash on January 29, 2022, 06:40:17 PM

Quote from: Heiwa on January 29, 2022, 05:04:54 PM

Quote from: Stash on January 29, 2022, 12:20:50 PM

Quote from: Heiwa on January 29, 2022, 09:43:14 AM

Quote from: Bullwinkle on January 29, 2022, 08:29:09 AM

Quote from: Heiwa on January 28, 2022, 11:00:48 PM

Can anyone explain to me why the JWST spacecraft needs a "trim flap" to stay on course observing the beginning of the Universe, thanks.

. . . . . to stay on course

Of course - certainly - but a trim flap!?!?

All is explained and calculated in here. Time for you to do some actual learning:

[1] S. Yoon, "Orbit Determinaton for the James Webb Space Telescope," in 24th International Symposium on Space Flight Dynamics, Laurel MD, 2014.
[2] NASA, "James Webb Space Telescope," NASA, [Online]. Available: jwst.nasa.gov. [Accessed 10 Mar 2014].
[3] J. Mather, "The James Webb Space Telescope and Future IR Space Telescopes," in Space 2004 Conference and Exhibit, San Diego CA, 2004.
[4] D. Dunham and R. Farquhar, "Libration Point Missions, 1978-2002," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[5] J. Danby, Fundamentals of Celestial Mechanics, Richmond VA: Willmann-Bell, 1998.
[6] R. Henry, W. Kinzel and M. Jordan, "JWST Scheduling with SODRM 2012, Preesnted to the JWST AWG," Space Telescope Science Institute, Baltimore MD, 2014.
[7] W. Kinzel, "JWST Angular Momentum Management with Pass 1 and 2 Torque Tables," Space Telescopt Science Institute, Baltimore MD, 2007.
[8] Space Telescope Science Institute, "James Webb Space Telescope Field-of-Regard and Sky Coverage," 2014. [Online]. Available: http://www.stsci.edu/jwst/overview/design/field-of-regard. [Accessed 20 March 2014].
[9] C. Roberts, "Long Term Missions at the Sun-Earth Libration Point L1: ACE, SOHO and WIND," in AAS Astrodynamics Specialist Conference, 2011.
[10] K. Howell and H. Pernicka, "Stationkeeping Method for Libration Point Trajectories," J. Guidance, Control and Dynamics, vol. 16, no. 1, pp. 151-159, 1993. 19
[11] T. Pavlak and K. Howell, "Strategy for Optimal, Long-Term Stationkeeping of Libration Point Orbits in the Earth-Moon System," in AIAA/AAS Astrodynamics Specialist Conference, Minneapolis MN, 2012.
[12] D. Folta, T. Pavlak, A. Haapala and K. Howell, "Earth-Moon Libration Point Stationkeeping: Theory, Modeling and Operations," in 1st IAA/AAS Conference on the Dynamics and Control of Space Systems, Porto, Portugal, 2012.
[13] M. Beckman and A. Delion, "James Webb Telescope Stationkeeping Analysis," in AGI User's Conference, 2003.
[14] L. Janes and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006.
[15] M. Hechler and J. Cobos, "Herschel, Planck and GAIA Orbit Design," in 7th International Conference on Libration Point Orbits and Their Applications, Parador d'Aiguablava, Girona, Spain, 2002.
[16] C. Schiff, "James Webb Space Telescope Mission Critical Design Review [Powerpoint charts]," 2006.
[17] D. Gidanian, "JWST Solar Torque Modeling," Northrop Grumman Aerospace Systems, Redondo Beach CA, 2008.
[18] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Analysis Working Group, Apr 2013, 2013.
[19] T. Johnson and V. Coppola, "Solar Radiation Pressue Plugins," Analytical Graphics Inc., 2010.
[20] D. Folta, Interviewee, Personal communication on MAVEN mission. [Interview]. Mar 2013.
[21] C. Schiff and E. Dove, "Monte Carlo Simulatons of the Formation Flying Dynamics for the Magnetospheric Multiscale (MMS) Mission," in TBD, TBD, TBD.
[22] D. Dichmann, C. Alberding and K. Richon, "JWST Stationkeeping Analysis: Monte Carlo Simulation Results," in JWST Spacecraft Critical Design Review, 2014.
[23] K. Gordon, "James Webb Space Telescope Mission Science and Operations Center: Science Operations Design Reference Mission Revision C," Space Telescope Science Institute, 2012.
[24] M. Ziebart, "High Precision Analytical Solar Radiaton Pressure Modelling for GNSS Spacecraft," Ph.D. Dissertation, University of East London, London, 2001. 20 Appendix. Solar Pressure and Atmospheric Drag (SPAD) Modeling for JWST The SPAD tool was developed at NASA Goddard to compute SRP and

But the trim flap doesn't solve the the momentum problem.

Start reading. You might actually learn something for a change.

OK - I started with [8] and it had been retracted. Probably usual garbage.

How do you know it was “retracted”?  It’s just not there. It’s from a course given at the institute 8 years ago.

In any case, 1 down, 23 more to go. Let us know when you’ve completed your reading.

You asked me to have a look of your evidence that a a trim/momentum flap is required to steer a space craft and there was none. Pls copy [14] L. Janes know and M. Beckman, "Optimizing Stationkeeping Maneuvers for James Webb Space Telescope," in NASA Goddard Flight Mechanics Symposium, 2006, about a trim/momentum flap a trim/momentum flap for station keeping. I know the location of the L2 point but not its speed through the Universe but I am curious to find out how a trim flap will keep me in location, when I am blown away by a solar wind of unknown force.

Keep reading.

Have you sent [14] so I can read it?

You’ve got 23 papers/articles/chapters/books to go through, so you best get busy and do some learning.