TEC 250/20 at native FL (5m), ST-10XME
Thirty 1 sec images (with small ROI)  R, G and B, best 10 of each stacked in CCDStack
Original image scale 0.28"/px, resample here to 0.14"/px (Separation of Triton and Neptune measured on original uncalibrated frame)
Colors determined using Don Goldman's Astrodon RGB Calculator
The ST-10 has small pixels and a high QE. It also has a large enough chip to find these small targets for framing.
Neptune and Triton
October 15 2215H PDT
(Oct 16 0515H UTC