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Spiral Galaxy NGC 891 (Silver Sliver Galaxy, LEDA 9031, MCG+07-05-046, UGC 1831, Caldwell 23), type Sb, in Andromeda

LRGB combination - original FOV (Click for a larger view 2015 x 2015 px)

 

LRGB combination - 100% crop (800px x 800 px)

Details

Spiral Galaxy NGC 891 (Silver Sliver Galaxy, LEDA 9031, MCG+07-05-046, UGC 1831, Caldwell 23), type Sb, in Andromeda

Discovered by Caroline Herschel and reported in William Herschel's "Catalogue of One Thousand new Nebulae and Clusters of Stars" (1786)

NGC 891 galaxy is perhaps the most beautiful example of a near-by spiral galaxy viewed edgewise. NGC 891 is part of a small group of galaxies bound together by gravity. This particular galaxy is of interest to astronomers that study the dynamics of material in the galactic plane of spiral galaxies. The galaxy, spanning some 100 000 light-years is about 30 million light-years distant in the constellation Andromeda. It is seen exactly edge-on, and reveals its thick plane of dust and interstellar gas. While initially thought to look like our own Milky Way if seen from the side, more detailed surveys revealed the existence of filaments of dust and gas escaping the plane of the galaxy into the halo over hundreds of light-years. The dust has likely been blown out of the disk by supernova explosions or intense star formation activity.

 

Right Ascension 02 : 22.6 (h:m)
Declination +42 : 21 (deg:m)
Distance 30 000 (kly)
Visual Brightness 10.8 (mag)
Apparent Dimension 12.3 x 3.09 (arc min)

Seeing: Pickering 8 rating - Very good
Optic(s): RC 12" with Astro-Physics corrector @ f/5.4
Mount: ASA DDM85 Premium
Camera: ATIK 4000 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomik LRGB set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2012-08-25
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 210 min, R = 70 min, , G = 70 min, , B = 70 min, subs. 10 min, Bin 1, Total Exposure Time - 420 min

More details: Dark and flat frames reduction
Guiding: All subexposures are unguided thanks to ASA DDM85 Premium mount
Processing:

PixInsight / PS

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