Horsehead IC1805 Horsehead

(These are very large files - Broadband recommended on anything over the 50% size)

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Date: October, 2008
Exposure: LRHaGB - 360m : 225m : 420m : 165M : 180m
24 x 900s L, 15 x 900s R, 14 x 1800s Ha, 16 x 900s G, 12 x 900 B
Processing: CCDAutoPilot4 used to collect data over multiple nights. CCDSoft for image acquisition, CCDStack on a x64 Vista machine for Image calibration, Astrodon LRGB filters (35 flats each L,R,G,B,Ha, Bias subtracted and Sigma Clip combined, 65 bias frames Sigma Clip combined, 40 x 900s darks, 25 x 1800s darks, Sigma Clip combined), alignment, normalization, FITS master files creation, and RHaGB raw TIFF creation. Photoshop CS2 for final LRHaGB processing, final layers adjustment and jpg conversion for the website.
Conditions: Good to Excellent, Mag 6-7 Skies
Scope: FSQ-106N
Camera: SBIG STL-11000M, -20°
Comments: At 7,500 light years away, IC 1805 is a very large emission nebula mix of glowing interstellar gas and dark dust clouds in the constellation Cassiopeia. At approx. 200 light years across, its hydrogen gas has been ionized by ultraviolet radiation from young hot stars. The nebula takes on the shape of the human heart, hence its nickname, The Heart Nebula. It is located in a very active star forming region of the galaxy and has at its center, the bright star cluster of newly born stars known as Melotte 15.