NGC 891 (Caldwell 23) edge-on spiral galaxy type Sb in Andromeda. Taken Oct 21, 22 2007 with a DSI
Pro II and Outback Cooler on a C8NGT (8" Newtonian f5). LRGB subframes were 3 minutes resulting in
the following total exposures L:R:G:B (min) = 135:63:66:60. Color balance was achieved via
numerically scaled channels. Captured with Envisage, calibrated and sigma combined in Iris with
other processing using FITZ, PixInsight LE and Photoshop CS. North is up.