Telescope: Meade SN10 at f/4, Orion Atlas EQ-G
Camera: ZWO ASI294MC Pro, 0C; Gain: 200
Filter: 2” Orion Imaging Skyglow Filter
Guide scope: Williams Optics 50mm, Meade DSI Pro II, PHD
Exposure: 48x240sec saved as FITS
Darks: 32x240sec saved as FITS
Flats: 32x10sec taken with an LED tracing tablet covered with 3 layers of muslin
Average Light Pollution: Red zone, Bortle 8, fair transparency, passing haze
Lensed Sky Quality Meter: 18.6 mag/arc-sec^2
Stacking: Mean with a 2-sigma clip.
White Balance: Nebulosity Automatic
Software: Nebulosity, Deep Sky Stacker, Photoshop
This is NGC 891, a fairly large edge-on spiral galaxy in Andromeda. This object is difficult to see visually, but knowing what it shows photographically makes it worth the effort. The dark lane cutting across the galaxy is a band of dust and gas that tends to collect in the plane of spiral galaxy arms. You can see the dust lane of our own galaxy as a dark rift high overhead in the summer Milky Way. If you look closely, you can glimpse several tiny galaxies hiding in the distance. I particularly like the tiny edge-on spiral in the lower left corner of this field (PGC 9151, Mv 15.8).