this post was submitted on 06 Dec 2023
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They have to rotate it fast enough, and hubble is not built to rotate that fast
Is it an actual limitation of the hardware or a software safety limit? The designs are similar it more has to do with limitations put on it.
They mention they can’t because the gyro vibrates, so it does sound like it’s capable of spinning faster it’s limited for specific reasons. Now are those reasons detrimental to its use or would they just have to get fancier.
These can’t be answered.
The sattelite bus for the KH-11 Spy sattelites (which hubble is based on) uses thrusters for orientation (and has a huge propellant tank) while the Hubble sattelite bus uses several gyroscopes for orientation. They are not as similar as you might think.
With reaction wheels/gyros could they not build up momentum over time to achieve the appropriate spin rate to match earths rotation?
After that it would just be timing and they could also layer multiple images together to work out details in theory.
You cannot spin up gyros indefinitely like e.g. in KSP.
Why would you need to? What would strip the momentum enough for it to constantly need to spin after it’s built up?
Nothing. It just wouldn't reach the rotation rate in the first place. (and the camera equipment would be unusable due to the vibrations of the gyros long before it reaches theoretical maximum, as already stated in the video)
How do you know it can’t? What the limitation?
Stop the gyros, take the picture activate again if needed to keep momentum.
There’s ways, you’re just not thinking creatively enough and you also aren’t providing actual explanations for why.