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Classification: Spiral Galaxy, NGC891, Caldwell 23, H19-5
Constellation: Andromeda (AND)
Object Location: Ra 02h 23m 32s Dec +42° 25’05° (current)
Size & Distance: 13.9 x 3 Apx 30 Million light-years.

Date & Location: 09-14-2012 Palomar Mountain, CA.
Exposure: LRGB L= 6@ 10min, RGB= 4@ 10min, all (bin 1x1)
Optics: Telescope Engineering Company APO160FL @ f/7.2 F/L 1152mm.
Mount: Astro-Physics 900 GTO / ATS 10x36 Pier
Camera: SBIG-ST10XME @ -10c
Filters: Astrodon G2 LRGB
Software: MaxImDL 4.56, CCDStack, Photoshop CS5, Topaz Lab.

Notes: Sky conditions: Average seeing, light winds, low 78°
Image Field of view is 27.3 x 16.9 arcmin.

NGC 891 is an edge-on unbarred spiral galaxy about 30 million light-years away in the constellation Andromeda. It was discovered by William Herschel on October 6, 1784. The galaxy is a member of the NGC 1023 group of galaxies in the Local Supercluster.

The galaxy is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures.
In 1999, the Hubble Space Telescope imaged NGC 891 in infrared.
In 2005, due to its attractiveness and scientific interest, NGC 891 was selected to be the first light image of the Large Binocular Telescope. In 2012, it was again used as a first light image of the Discovery Channel Telescope with the Large Monolithic Imager.
Supernova SN 1986J was discovered on August 21, 1986 at an apparent magnitude 14.