4 ms·

I'm nor sure - does the big mirror have to be cooled all the way, or just a bit, and what needs to be cooled are the more compact fiddly bits in the middle ? A

I'm nor sure - does the big mirror have to be cooled all the way, or just a bit, and what needs to be cooled are the more compact fiddly bits in the middle ? Also, I wonder since the L2 spot is theoretically (partly) shaded by the earth, how much Watts/m^2 do you avoid ?

sbierwagen 5y ago
An object in a halo orbit spends most of its time out of Earth's shadow: https://en.wikipedia.org/wiki/Halo_orbit#/media/File:Animation_of_Solar_and_Heliospheric_Observatory_trajectory_-_Polar_view.gif https://en.wikipedia.org/wiki/Halo_orbit#/media/File:Animati... Hubble used cooled instruments, warm mirror. If you only partially cool a mirror then thermal expansion effects will mess up the focus. In the paper they propose heating segments that are shadowed, to keep the whole mirror at the same temp.