Horsehead NGC3628 Horsehead

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(Click here to see my previous effort from New Mexico Skies on 04/02/2003)

Date: March 1, 2005
Exposure: LRGB : 120:90:70:120
24 x 300s L, 6 x 900s R , 7 x 600s G & 12 x 600 B
Processing: CCDSoftV5 for image acquisition.MaxIm for image calibration,(10 each LRGB flats, dark subtracted and median combined, 80 bias frames median combined, 15-900s darks Sigma Reject combined), alignment, normalization, stretch, and RGB combine. 3 iterations of CCDSharp on the Lum layer. Photoshop CS for LRGB processing,final adjustment and jpg conversion.
Conditions: Clear but fair to poor seeing
Scope: AP180EDT @ f/9
Camera: ST-10XME/CFW-8A -20°
Comments: The skies were clear. Good transparency, but the seeing was not great. I put the AP180 back on the Paramount while continuing to work on my C14s mirror drift. The ST-10 matches up nicely with the 180 giving approx. 0.85"/pix resolution. I was getting around 3.1 to 3.5" FWHM which is about average for this time of the year. Light pollution and gradients made this one (and all of my images for that fact) difficult to process. Recommendation - Take twice the color you think you need when imaging in light polluted skies, and then take some extra green.......