Horsehead NGC6559 Horsehead

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Date: July 24, 2004
Exposure: RRGB : 12 x 300s R, 16 x 300s G, 12 x 600s B
Processing: CCDSoftV5 for image acquisition. MaxIm for image calibration,(15 flats each HaRGB, dark subtracted and median combined, 25 bias frames median combined, 15-1200s darks median combined). Dead/hot pixel removal, alignment, normalization, color combining, unsharp on Ha, R and B using CCDSharp 2 iterations. Photoshop CS for final color balance, RRGB combine and jpg conversion.
Conditions: Fair skies, but light haze, Mag 4 Skies
Scope: AP180EDT @ f/7.4 on a Paramount ME
Camera: SBIG ST-10XME/CFW-8A, -15°, AP 0.67 Focal Reducer
Comments: This is a bright (emission and/or reflection) nebula in Sagittarius. This object is low on my horizon and is blocked in the East until about 2 hours before the meridian. Due to the time of year, it doesn't get dark enough to image until around 10:00pm and this object was transiting around 10:40 pm. I only have 3 hours after transit before it gets too low. This was taken over six nights with varying conditions. It took all six nights as I fought clouds, haze, and the moon.