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Spiral Galaxy NGC 2403 (= H V.44), type Sc, in Camelopardalis

LRGB combination (Click for a larger view 1800 x 1800 px)

 

LRGB combination as B/W (Click for a larger view 1800 x 1800 px)

Details

Spiral Galaxy NGC 2403 (= H V.44), type Sc, in Camelopardalis

Discovered by William Herschel in 1788.
NGC 2403 is among the more conspicuous Northern objects which Charles Messier missed when compiling his catalog. Thus its discovery was left to William Herschel. This beautiful spiral galaxy is an outlying member of the M81 group of galaxies, and thus about 12 million light years distant. Similar in morphology to M33, NGC 2403 is noted for its exceptionally bright HII regions and high rate of star formation.

Right Ascension 7 : 36.9 (h:m)
Declination +65 : 36 (deg:m)
Distance 12 000 (kly)
Brightness +8.4
Apparent Dimension 17.8 x 11.0 (arc min)

Seeing: Pickering 7 rating - Good
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 Truetek Computerized Filter Wheel
Dates/Times: 2011-10-28
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

L = 75 min (1x1 binning), R = 50 min, G = 40 min, B = 40 min, (1x1 binning), Subexposures LRGB = 5 min, Total Exposure Time - 205 min

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

PixInsight / PS

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