# Thread: Star shade - how long to fly to new position when pointing telescope

1. Newbie
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Sep 2020
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## Star shade - how long to fly to new position when pointing telescope

The star shade... imagine it's all lined up to make an observation. Then the telescope is pointed in a different direction. How long does it take the star shade to fly to the new location to line up again? Do both space craft fly to new locations when the telescope points? Are both space craft orbiting opposite sides of a Legrange point? Does one or both of the spacecraft need a lot of fuel?
Thanks!
Mark Johnson.

2. The Star Shade would supposedly function with existing telescopes, like the James Webb. If it were deployed with the James Webb, then the telescope would sit at the L2 Lagrange point, using fuel for stationkeeping and gyroscopes to slew on to new targets. The Star Shade would be positioned tens of thousands of kilometres away, and would use fuel to fly to a new position each time the telescope changed target. I guess how long it would take and how much fuel it would use would depend on the final design of the Star Shade, and how far apart successive telescopic targets were.

Grant Hutchison

3. Order of Kilopi
Join Date
Jun 2006
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4,881

## Many Considerations

Originally Posted by grant hutchison
The Star Shade would supposedly function with existing telescopes, like the James Webb. If it were deployed with the James Webb, then the telescope would sit at the L2 Lagrange point, using fuel for stationkeeping and gyroscopes to slew on to new targets. The Star Shade would be positioned tens of thousands of kilometres away, and would use fuel to fly to a new position each time the telescope changed target. I guess how long it would take and how much fuel it would use would depend on the final design of the Star Shade, and how far apart successive telescopic targets were.

Grant Hutchison
Originally Posted by markjnet
The star shade... imagine it's all lined up to make an observation. Then the telescope is pointed in a different direction. How long does it take the star shade to fly to the new location to line up again? Do both space craft fly to new locations when the telescope points? Are both space craft orbiting opposite sides of a Legrange point? Does one or both of the spacecraft need a lot of fuel?
Thanks!
Mark Johnson.
Another possibility.

From the Wiki article:

The possibility of two starshades is also a consideration. One starshade to point towards the desired target while the other moves into position for the next target.
Reference is here:

https://en.wikipedia.org/wiki/New_Worlds_Mission

Certainly a fascinating project, especially being able to use existing telescopes.

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