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Horsehead / Flame

Classification: Dark Nebula / Emission Nebula / Reflection Nebula.
Constellation: Orion (ORI)
Object Location: Ra 05h 41m 43s Dec -02° 08’38” (current)(centered)
Size & Distance: Apx.60.0 x 120.0, Apx 1500 light years.

Date & Location: 01-17-2015 Little Blair Valley, CA.
Exposure: HaRGB; 60, 30, 30, 30, Ha-20m. RGB-5m (bin 1x1)
Optics: Telescope Engineering Company APO180FL @ f/5.23 using an Astro-Physics TCC160 F/L 941mm.
Mount: Astro-Physics 1200 GTO / ATS 10x36 pier.
Camera: FLI-ML6303E @-30c / CFW2-7 / FLI-Atlas focuser / Guided by SBIG ST-I / w OAG.
Filters: Astrodon 3nm Ha, G2 RGB
Software: MaxImDL 6.07, Photoshop CS5, CCDStack 2.82, Topaz Labs.

Notes: Sky conditions: Above average seeing, No wind, Temp low 30’s
Image Field of view is 68 x 102 arcmin.
Ha and Red combined for the red channel. Ha was also used as a luminance layer..

B33 (Horsehead) is a Dark Nebula, NGC2024 (The Flame Nebula) and IC434 are Emission Nebulas, NGC2023 (low right of B33) is an Reflection Nebula in the constellation Orion. The nebulas are located just to the south of the star Alnitak, which is farthest east on Orion's Belt, and is part of the much larger Orion Molecular Cloud Complex as seen in this image. The nebula was first recorded in 1888 by Scottish astronomer Williamina Fleming taken at the Harvard College Observatory. It is one of the most identifiable nebulae because of the shape of its swirling cloud of dark dust and gases, which bears some resemblance to a horse's head. NGC2024 is to the left of the Horsehead, IC431 and IC432 are to the left of the Flame Nebula.