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NGC 253 (Silver Dollar Galaxy, Silver Coin Galaxy, Sculptor Galaxy, Caldwell 65), spiral Galaxy type Sc, in Sculptor

LRGB combination (Click for a larger view 1670 x 1670 px)

 

Details

NGC 253 (Silver Dollar Galaxy, Silver Coin Galaxy, Sculptor Galaxy, Caldwell 65), spiral Galaxy type Sc, in Sculptor. NGC 253 is the brightest member of the Sculptor group of galaxies, which is grouped around the South galactic pole (therefore, also sometimes named "South Polar Group"). The Sculptor group is perhaps the nearest to our Local Group of galaxies. NGC 253 is also one of the brightest galaxies beyond the Local Group.

Discovered by Caroline Herschel in 1783.

Right Ascension 00 : 47.6 (h:m)
Declination -25 : 17 (deg:m)
Distance 10000 (kly)
Visual Brightness 7.1 (mag)
Apparent Dimension 25 x 7 (arc min)

Seeing: Pickering 8 rating - Good to Excellent
Optic(s): Celestron 11" Schmidt Cassegrain + Alan Gee II telecompressor @ f/6.3
Mount: CGE equatorial
Camera: Artemis Art 4021 - monochrome CCD – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics L, R, G, B set, SupaSlim TrueTechnology Computerized Filter Wheel
Dates/Times: 2011-10-27
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 50 min, R = 20 min, G = 20 min, B = 20 min, (L=1x1 binning, RGB=2x2 binning), Subexposures LRGB = 5 min, Total Exposure Time - 110 min

More details: Dark and flat frames reduction
Guiding: Starlight Xpress Lodestar Autoguider on APO 90/600+barlow @ f/13.4
Processing:

PixInsight / PS

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