Horsehead NGC 2146 Horsehead

(Click on image for Full Resolution)

Date: November 2, thru December 2, 2005
Exposure: LLRGB: 300:135:135:180
30 x 600s L, 9 x 900s R, 9 x 900s G, 12 x 900s B
Processing: CCDAutoPilot2 in control for all images - CCDSoftV5 for image acquisition. MaxIm for image calibration,(5 each RGB flats, bias subtracted and median combined, 60 bias frames median combined, 20-900s darks Sigma Reject combined), alignment, normalization, stretch, and RGB combine. 3 iterations of CCDSharp on the Luminance layer. Photoshop CS for RGB processing,final adjustment and jpg conversion.
Conditions: Good, clear with nice transparency and lower humidity (60-70%) Mag 4-5 Skies
Scope: RCOS 16" Truss @ f/6
Camera: ST-10XME/CFW-8A -10°
Comments: A peculiar type Sb galaxy in Camelopardalis that is approx. 41 million light years away. I started collecting the data on November 2nd and due to weather and just generally very poor seeing for almost a month, I wasn't able to get good Lum. data. On December 1st it cleared and the sky settled and I was able to take 5 hours of additional Lum exposures. I used CCD Inspector to rank the images by FWHM and picked the best 30 for the Lum layer. The second set of data I took was after the addition of the RCOS field flattener. This definitely helped get tighter stars for the Lum layer.