Spiral galaxy NGC 891



NGC 891 (also known as Caldwell 23) 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. It has an H II nucleus. The object is visible in small to moderate size telescopes as a faint elongated smear of light with a dust lane visible in larger apertures. 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.

Imaging telescopes or lenses: Gso RC 12″ Ritchey-Chretien
Imaging cameras: canon 350 D Baader
Mounts: Swan Astro WS180GT
Resolution: 3292×3301
Frames: 50×360″
Integration: 5.0 hours
RA center: 35.632 degrees
DEC center: 42.348 degrees
Pixel scale: 0.268 arcsec/pixel
Orientation: 87.739 degrees
Field radius: 0.174 degrees
Author: nicola76

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