Horsehead NGC 891 Horsehead

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(Click here to see my previous best effort on 10/18/2001)

Date: November 9, 2004
Exposure: LRGB 280:60:90:60 : 28 x 600s L, 6 x 600 R,B, and 9 x 600 G
Processing: CCDSoftV5 for image acquisition. MaxIm V4 for image calibration,(25 flats each LRGB, dark subtracted and median combined, 40 bias frames median combined, 30-600s darks median combined). Dead/hot pixel removal, alignment, normalization, color combining, unsharp on Lum using CCDSharp 2 iterations. Photoshop CS for final color balance, LRGB combine and jpg conversion.
Conditions: Average, Mag 3-4 Skies Clear with above average transparency
Scope: C14 @ f/6.3
Camera: SBIG ST-8XE, -20°, Celestron 6.3 Reducer/Corrector
Comments: Taken over several nights which were clear with still air. Started the color exposures after 891 crossed the meridian. Color was binned 2x2 and Lum was binned 1x1. Second night was steadier that the first so I let CCDAutoPilot capture 5 hours of Lum and was able to use most of it. Used a combination of processing techniques from Ron Wodaski, Jerry Lodriguss, Don Goldman, and Ken Crawford.