I had to take images on two separate nights so I could use blinking to find the asteroid, but I managed to locate it in both images on the 4th and 7th of October.
The best image is a 3 hour totale exposure from last night, the green circle marks Sedna itself, at magnitude 20.9 one of the faintest things I've definitively images:
Conditions weren't great (lots of high clouds) so probably this doesn't represent some kind of absolute limit for my scope. The October 4th was much worse, transparency was beter but the seeing and the focus were worse *and* I forgot to update the pointing coördinates so the asteroid was way off-center in my image.
Still, I made an animated GIF showing the displacement of the asteroid in those three days (beware, the GIF is slightly over 3MB in size) : https://farm2.static...41c732bbb_o.gif
