Imaging telescope or lens: Celestron C14
Imaging camera: Atik 460EX
Guiding telescope or lens: CELESTRON Travelscope 70/400
Guiding camera: ASI120MM
Focal reducer: Optec NextGEN WideField 0.5X
Dates: March 28, 2017
Integration: 10.5 hours
Avg. Moon age: 29.40 days
Avg. Moon phase: 0.02%
Astrometry.net job: 1516307
RA center: 130.381 degrees
DEC center: 58.205 degrees
Pixel scale: 0.911 arcsec/pixel
Orientation: -173.956 degrees
Field radius: 0.223 degrees
Locations: Backyard Observatory, Imatra, kymi, Finland
Abell 28 planetary nebula is very faint object in Ursa Major and you cand find many images of this object. I took 10,5 hour of data with h-alfa filter, i tried also OIII and luminance, but they were absolute zero information.
First image is single 8min light, second inverted is more stretched 79x8min and final is 79x8min vesion. You can nsee from inverted vesion some faint structures at 5 o clock and 1 o clock
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