No. Objects at 1200km will not be illuminated "most of the night",
I will offer an addendum to this, after some furthe consideration. I've been approaching this in the midset of a polar (or near polar) orbit, akin to the Iridium Satellites. However, the initial batch is at 53Deg inclination. I cant find anything about the full constellation layout, where the 1200km satellite shell will be. The first 2 prototypes went to 97 deg, but thats likely due to the ride share they went up on, more then operational use case.
Satellites in this area, particlary in the norther sky during summer months, will have a longer visibility window, even lasting through the night for various rings. I still challenge how bright they will be, especially the ones at 1200km. The current craft up there are slated to be around magnitude 5-7, the light falls off quick (inverse square of distance) and gives the 1200km shell a much lower magnitude. Couple that with improved albedo in the design shop, their physical size, and the narrow FOV of a telescope.....its all going to be ok.
Tool here to get ALL sunlit passes over the course of 24hrs (includes pre-dawn, and post-dusk, rather than being noon centered). But I tossed in Washington State (where it defaulted), and got 6000 passes from assorted satellites (did not deconflict unique sats, just total pass count). The magnitudes go way down there, some in the 12-15 range, but the point being....sunlit satellites over the evening is nothing new, and no-one complained last week.
Phillip, I cant find a terribly consise source to answer your question. I have looked, and will continue too as time allows
Edited by Eddie_42, 30 May 2019 - 04:40 PM.