Posted by Nick James at 22:10 on 2013 Dec 22
Dave,Are you stacking images to offset at Gaia’s sky motion? At present it is 2.86"/min in PA300 but this changes quite quickly. The best way to get this info is to use the MPC space junk page here although I expect ESA would object to Gaia being called space junk!Given that Gaia is now fainter than mag 18 it is important to stack at the correct rate and offset so that it is not smeared out. This is very good practice for imaging faint asteroids so it is worth persevering.Nick.