Linked Questions
10 questions linked to/from Why put DSCOVR in a Lissajous orbit? Wouldn't a halo orbit completely avoid the Sun exclusion zone?
5
votes
1
answer
674
views
Why did we think that the object was gonna hit the Moon March 4th 2022? Who's been tracking and predicting it so closely?
The Guardian's 'Out-of-control' Chinese rocket falling to Earth... Oops, I mean Out-of-control SpaceX rocket on collision course with moon says that Bill Gray's Project Pluto/DSCOVR says that the 2015 ...
- 149k
5
votes
2
answers
192
views
Where is the Wind going? Where has it been? (Global Geospace Science spacecraft 1994-071A)
This excellent answer to Why put DSCOVR in a Lissajous orbit? Wouldn't a halo orbit completely avoid the Sun exclusion zone? explains that the Global Geospace Science or Wind spacecraft ...
- 2,144
7
votes
3
answers
3k
views
What is the required burn to keep a satellite at a Lagrangian point?
When a satellite reaches a Lagrangian point, it has a non-zero velocity $v_1$ because of the transfer orbit in which it had already been. What burn, say, $\Delta v$, one needs if the satellite is ...
- 2,144
17
votes
4
answers
5k
views
Could JWST stay at L2 "forever"?
Using only reaction wheels powered by solar panel and the sunshield as a sail (in continuous active attitude control) to generate thrust from solar photon pressure in the desired direction, could JWST ...
- 2,144
18
votes
1
answer
7k
views
What happens to JWST after it runs out of propellant?
JWST will be orbiting L2 which is unstable equilibrium thus will require propellant for station keeping. JWST will carry propellant for 5-10 years.
What will happen once it runs out of propellant? ...
- 149k
3
votes
1
answer
262
views
Was Queqiao in a halo or Lissajous orbit? Why do sources disagree?
Wikipedia's Lissajous orbit says that sources disagree on the nature of Queqiao relay satellite's orbit; if it was in a proper halo orbit or just a Lissajous orbit.
Proper halo orbits have the same ...
- 149k
9
votes
1
answer
409
views
How would you identify when an object in a Lissajous orbit needs station keeping?
Obviously, with the international space station you need to do some station keeping when you're falling into the atmosphere. However, I saw the following image showing the Halo orbit that the Deep ...
- 149k
16
votes
3
answers
2k
views
Why would a mission to Sun-Earth L1 have an instantaneous launch window?
I was watching the webcast for Falcon 9 Flight 15 (launching DSCOVR) when they scrubbed their first launch attempt due to some issues during the terminal countdown. Before the scrub, the narrator ...
- 2,144
10
votes
1
answer
624
views
What exactly is the interaction that blocked Juno's data downlink near solar conjunction?
According to Space.com's article Juno Phones Home: Jupiter Probe Reconnects with Earth After 8th Flyby, Juno's recent close flyby of Jupiter and data collection happened while Jupiter was too close to ...
- 2,304
11
votes
1
answer
4k
views
What is the difference between halo orbits and Lissajous orbits?
The Wikipedia articles for halo orbit and Lissajous orbit leave me wondering how these two orbits are different from an orbital mechanical point of view.
Could they be discussed together here, so I ...
- 149k