I was inspired by Fabio Plocostomos and Chris Go's work on Ceres at high res and decided to go for it myself near opposition or good seeing. So that single 2 day break in rain and clouds a week ago yielded some good Venus and Saturn images and also this great view of Ceres.
I had a hard time finding some good ephemeris data for angular size so calculated it myself as follows:
δ = d / D, where δ is the angular size, d is visual diameter and D is the distance to the object.
So using the WRONG units I get:
1.64AU distance to Ceres and 950km diameter of Ceres gives 0.798".
I hope to not have overexposed the object which would have caused bloat or bloom in the data. I stretched in post processing and resized to 200%