NGC 6888
Crescent Nebula

Click image for a larger view

Location & Date Backyard, Abbott Observatory June 21, 22 & July 17, 2006
Temperature high 70'sF, Transparency - Fair, Seeing - 4/5
Telescope Celestron C8-N 8" Reflector F/5, Losmandy G11 mount, Prime Focus
Image scale 1.52 arcsec/pixel
Camera SBIG ST-2000XCM color camera
CCD temp -15C
Exposure Times 24 X 8 minutes 3.2 hours - Color
20 X 15 minutes 5 hours - Hydrogen Alpha
Other Information Image acquisition - CCDSoft V5
Focus - Moonlite Motorfocus
Baader UV/IR filter stacked to an Orion Skyglow filter for color data.
Astronomik 13nm Ha filter for Hydrogen Alpha data
Guide Scope: Orion ED80 w/modified Celestron NexImage.
Guiding program -GuideMaster
Image Processing * Images Plus 2.75 -
Calibration, Bayer Interpolate, Grading, Alignment, Sigma Clipped Average Combine, mild DDP, R/L deconvolution.
* Adobe CS - Levels, Curves, Masks, Sharpening, RGB balance, Cropping, JPEG conversion
The color image is a Ha+GB composite. The Ha data was mixed 75% with the R channel then recombined with the GB data.


© 2006 Michael A. Siniscalchi