Horsehead M77 Horsehead

(Click on image for Full Resolution)

Date: December 15-22, 2005
Exposure: LRGB: 160:90:180:120
16 x 600s L, 6 x 900s R, 12 x 900s G, 8 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 CS2 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: M77 is a type Sb almost face-on spiral galaxy in the constellation Cetus. It is over 170,000 light years across and over 49 million light years away. The images were taken over multiple nights due to the need to wait for it to rise out of the light pollution in the East.