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I agreeImaging telescope or lens:Borg 90FL
Imaging camera:ZWO ASI 183MM Pro
Mount:Celestron AVX Mount
Guiding telescope or lens:Agena Astro 50mm f/3.9 Guidescope
Guiding camera:ASI224MC
Focal reducer:Borg 0.72X Quadruplet Super Reducer, #7872
Software:Stark Labs Nebulosity 4.2 , Digital Photo Professional , IDEIKI AstroPhotography Tool (APT) , PHD2 Guiding , SharpCap Pro 3.1
Filters:Optolong 7nm Ha 2" , Astronomik 6nm OIII
Dates:Sept. 29, 2018
Frames:
Astronomik 6nm OIII: 21x300" (gain: 140.00) -15C bin 1x1
Optolong 7nm Ha 2": 24x300" (gain: 140.00) -15C bin 1x1
Integration: 3.8 hours
Darks: ~30
Flats: ~30
Flat darks: ~30
Avg. Moon age: 19.10 days
Avg. Moon phase: 80.23%
Bortle Dark-Sky Scale: 2.00
Temperature: 10.00
Astrometry.net job: 2292699
RA center: 22h 29' 41"
DEC center: -20° 49' 40"
Pixel scale: 1.362 arcsec/pixel
Orientation: 359.151 degrees
Field radius: 0.737 degrees
Resolution: 3240x2160
Data source: Traveller
The Helix Nebula, NGC 7293, Caldwell 63, is a large planetary nebula, formed by an intermediate to low-mass star, which sheds its outer layers near the end of its evolution. It is located in the constellation Aquarius and was discovered by Karl Ludwig Harding, around 1824. This object is one of the closest to the Earth of all the bright planetary nebulae, at approximately 700 light years from Earth, and spans 2.5 light years across. It is similar in appearance to the Cat's Eye Nebula and the Ring Nebula, whose size, age, and physical characteristics are similar to the Dumbbell Nebula, varying only in its relative proximity and the appearance from the equatorial viewing angle. The remnant central stellar core is destined to become a white dwarf star. The observed glow of the central star is so energetic that it causes the previously expelled gases to brightly fluoresce.
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