Abell 21
Medusa Nebula

Click image for a larger view

Location & Date Backyard, Abbott Observatory Jan. 21 & Feb. 8, 2007
Temperature low 10'sF, Transparency - Good, Seeing - 3/5
Telescope TMB 130SS Refractor, F/7 on a Losmandy G11, Prime Focus, Image scale 1.68 arcsec/pixel
Camera SBIG ST-2000XCM color camera
CCD temp -25C
Exposure Times 11 X 15 minutes - 2.75 hours - Color
7 X 30 minutes - 3.50 hours - Ha
Other Information Image acquisition and guiding - CCDSoft V5
Celestron LPR w/Baader UV/IR - Color
Astronomik 13nm Ha filter - Ha
Image Processing * Images Plus 2.75 - Calibration, Bayer Interpolate, Grading, Alignment, Sigma Clipped Median Combine, mild DDP
* Adobe CS - Levels, Ha blend in to R and Lum channels, Curves, Cropping, JPEG conversion

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© 2007 Michael A. Siniscalchi