Linked Questions

12
votes
3answers
3k 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 ...
9
votes
1answer
1k views

Can/Will the James Webb Telescope maintain its position passively?

A recent article about the telescope states (emphasis mine): Unlike Hubble, which orbits the Earth at about 340 miles of altitude, Webb will be sent almost a million miles into space, at a ...
6
votes
2answers
1k 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 ...
9
votes
1answer
1k views

What are the sources of light at L2? How will the James Webb telescope be powered?

The James Webb space telescope will be positioned very close to L2. According to JPL, Webb will have a large solar-array to power itself. I don't understand how this works, since L2 is positioned "...
10
votes
2answers
897 views

Can the James Webb Space Telescope basically manage its own orbit if necessary?

In this great answer I learned that the Mars rover Curiosity can be given some tasks and it will go ahead and manage the work and navigation by itself, to at least a certain limit. The James Webb ...
15
votes
1answer
1k views

Halo vs Lissajous orbit: Which station-keeping strategy to select and when?

I'm looking for a comprehensive pros and cons of the two most commonly used station-keeping types of orbits used at libration points, Lissajous and halo orbits. When would one select one over the ...
7
votes
2answers
372 views

Besides HST, JWST and stations, are there any examples of satellites designed for service in space?

update: I've just read these intriguing first sentence in the recently published (and paywalled) Aviation Weekly article No Second Chances On Webb Telescope Deployment: NASA has no plans to service ...
5
votes
1answer
329 views

Is Landsat-7's propellant resupply port “robot-ready”? (Restore-L mission)

note: the recent 2019 news Northrop's satellite refueling spacecraft launches on October 9th which is sourced from Mission Extension Vehicle Headed for Space reminded me that there may be some ...
3
votes
1answer
111 views

How will JWST maintain its elliptical orbit around L2?

I understand that JWST will have a vertical elliptical orbit around L2, but what I don't understand is how the telescope will actually maintain an orbit if there is no body in L2 to actually orbit ...
6
votes
1answer
174 views

Do Lagrangian points apply to eccentric orbits or binary systems?

The assumptions about the Lagrangian points being stable (...in the traditional meaning of the word: not moving around; they are unstable in the mathematical sense, except for arguably L4, L5) that I'...
3
votes
1answer
68 views

Orbit ephemeris or visualization for the BepiColombo mission?

Where is it possible to see the progress of the BepiColombo mission in terms of ephemeris and or graphical visualisation? I should add, I've checked JPL Horizons, though its not clear how to specify ...