Re:NASA mistakenly severs communication to Voyager 2
by curiousObject on Monday July 31, 2023 @11:51AM
(#36944482)
>reorientation is an expensive process
That’s true, but a failsafe automatic reorientation mode after two weeks with no communication from Earth might be a useful feature
Re:NASA mistakenly severs communication to Voyager 2
by jjk166 on Monday July 31, 2023 @12:47PM
(#36945357)
On the timescale of decades, does a 2 week vs a 10 week waiting period make much of a difference?
Re:NASA mistakenly severs communication to Voyager 2
by curiousObject on Tuesday August 01, 2023 @03:36AM
(#36953411)
>On the timescale of decades, does a 2 week vs a 10 week waiting period make much of a difference?
I agree. It probably doesn’t make much difference now. There’s very unlikely to be any important data that will be lost. The mitigation process they already implemented seems prudent and sufficient
During earlier parts of the mission, like planetary encounters, it would make a difference. Even a two week wait could be much too long in those circumstances.
Re:NASA mistakenly severs communication to Voyager 2
by jjk166 on Tuesday August 01, 2023 @10:52AM
(#36956706)
Presumably during encounters the probe was in a different control scheme to keep its instruments pointed at the planet, as opposed to keeping its antenna pointed at Earth.
Re:NASA mistakenly severs communication to Voyager 2
by Dylan16807 on Monday July 31, 2023 @03:42PM
(#36947736)
Reaction wheels only saturate by absorbing external acceleration, though.
You can reorient as much as you want with a reaction wheel, and the only cost is electricity.
Propellent is finite, so you want to use it as rarely as possible.
A reaction wheel is by itself infinite (assuming it doesn't break), but eventually it saturates and you need to desaturate it, which basically means spinning the wheel the other way while spending propellent to maintain position.
All of this is to say, reorientation is an expensive process especially if refueling isn't an option.