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Spiral Galaxy NGC 7331, type Sb, in Pegasus

LRGB combination - (Click for a larger view 1750 x 1750 px)

 

 

LRGB combination - 100% crop

 

 

Other galaxies

NGC 7335

NGC 7336

NGC 7337

NGC 7340

PGC 2051985

PGC 69291 and PGC 69281

 

100% crop - inverted B/W version

 

Details

Spiral Galaxy NGC 7331, type Sb, in Pegasus

Discovered by William Herschel in 1784.

NGC 7331 is the largest one among the easily identifiable galaxies in this group (left to right, from the top) NGC7340, NGC7337, NGC7336, NGC7335, NGC7331 (the largest), NGC3725, NGC 7326, PGC 2051985, PGC69291, PGC69281

The large galaxy dominating this image in the constellation of Pegasus, called NGC-7331, is located about 50 million light years from our planet. Visible in the image are three distant background galaxies (NGC7336, 7335, 7337). They are approximately 10 times more distant than NGC 7331. NGC 7331 bears a resemblance to our Milky Way galaxy, including number of stars, mass, spiral arm pattern and star-formation rate. The Spitzer Infrared Space Telescope has made extensive studies of this island universe and discovered an intensely hot inner ring of material indicating a region where new stars are being generated.

 

Right Ascension 22 : 37.1 (h:m)
Declination +34 : 25 (deg:m)
Distance 50 000 (kly)
Visual Brightness 9.5 (mag)
Apparent Dimension 11 x 4 (arc min)

Seeing: Pickering 7 rating - 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: 2012-07-13
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 70 min, R = 30 min, , G = 30 min, , B = 30 min, subs. 10 min, Bin 1, Total Exposure Time -160 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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All Contents copyright Velimir Popov unless otherwise noted.