Imaging telescope or lens: RC Optical Systems RCOS 12.5 Astrograph
Imaging camera: FLI ML8300
Mount: ASA DDM85X-SL
Guiding telescope or lens: RC Optical Systems RCOS 12.5 Astrograph
Dates: April 25, 2013
Frames: Astrodon Tru-Balance - H-a 50mm - 3nm FWHM 656.3nm: 14x600" (gain: 0.42) -35C bin 1x1
Integration: 2.3 hours
Flat darks: ~50
Avg. Moon age: 13.83 days
Avg. Moon phase: 99.02%
Bortle Dark-Sky Scale: 2.00
Astrometry.net job: 107774
RA center: 270.579 degrees
DEC center: -23.035 degrees
Pixel scale: 0.377 arcsec/pixel
Orientation: 179.787 degrees
Field radius: 0.218 degrees
Locations: SpaceIgloo Observatory, Williamson, AZ, United States
This image was captured using my new RCOS 12.5" carbon fiber astrograph. The data was created with 14 600s subs of 3nm Ha data at 2857mm FL. I used an MMOAG nad ST402ME to autoguide my ASA DDM85X-SL mount.
It's really interested to watch a guide star at this focal length and a lot of information can be obtained about both the tracking capabilities of the mount as well as the seeing conditions in which you are imaging.
The images were processed in CCDStack and PixInsight.
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