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IC434, B33 (Horsehead Nebula) and NGC 2023 in Orion

L-HaR-GB combination-star spikes added (Click for a larger view 1400 x 1400 px)

Details

IC434, B33 (Horsehead Nebula) and NGC 2023 in Orion

The Horsehead Nebula is one of the most famous nebulae, about 1600 light years away, in the constellation of Orion. The horse head feature is actually a dark nebula, of opaque dust, also cataloged as Barnard 33 or B33. Just to the south of Alnitak, this region is dominated by the background emission nebula known as IC 434. The emission nebula's red color is caused by electrons recombining with protons to form hydrogen atoms. Barnard 33 (B 33) is thought to be part of the underlying dust cloud that forms the dark lanes in the Flame Nebula.
NGC 2023 - This bright complex of dust and gas is located near the famous Horsehead Nebula, slightly below the left. It reflects the light given off by the bright star near it's center and is one of the brightest examples of reflection nebulae in the northern sky. The central star is surrounded with a thin shell of hydrogen that glows red by emitting its own light in a rare example of a unique process called vibrational fluorescence. There are also a dark clumps of gas that represent stellar nurseries containing one or more new stars hidden within. NGC 2023 nebula lies approximately 1 600 light years from earth.

The Horizontal FOV is about 25'. The image almost centered at:

Right Ascension 05 : 40.9 (h:m)
Declination -02 : 28 (deg:m)
Distance 1.6 (kly)
Brightness 7.2
Apparent Dimension for B33 - 6 x 4 (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 cooled CCD camera – 2048 x 2048 px ; 16x16 mm; 7.4 µm x 7.4 µm
Filters: Astronomics Ha, L, R, G, B set, SupaSlim Truetek Computerized Filter Wheel
Dates/Times: 2011-10-31
Location: Rozhen Observatory, BG, longitude: E 24 44' 18", latitude: N 41 41' 42"
Exposure Details:

Ha = 60 min , L= 30 min (unbinned), R = 25 min, G = 25 min, B = 35 min, (2x2 binning), Subexposures Ha = 10 min, LRGB = 5 min, Total Exposure Time - 175 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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