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Hemisphere:  Northern  ·  Contains:  IC 523
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Abell 31 • Sh2-290 Planetary Nebula in HaOIIIRGB, 


            Douglas J Struble
Abell 31 • Sh2-290 Planetary Nebula in HaOIIIRGB
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Abell 31 • Sh2-290 Planetary Nebula in HaOIIIRGB

Technical card

Imaging telescopes or lenses: Stellarvue SVX102T-R

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Orion Atlas Pro AZ/EQ-G

Guiding telescopes or lenses: Stellarvue 50mm Guidescope

Guiding cameras: ASI224MC

Software: PHD2  ·  Sequence Generator Pro  ·  PixInsight  ·  Photoshop CS5  ·  SkySafari Pro

Filters: Astronomik Ha 6nm 1.25''  ·  Astronomik Deep-Sky G  ·  Astronomik Deep-Sky R  ·  Astronomik Deep-Sky B  ·  Astrodon OIII 3nm

Accessory: QHYCCD PoleMaster  ·  Hotech 2" SCA Self-Centering Field Flattener  ·  ZWO 8x 1.25" Filter Wheel (EFW)  ·  MoonLite CFL 2.5" Large Format Focuser

Dates:Feb. 7, 2020April 20, 2020April 21, 2020

Astrodon OIII 3nm: 225x120" (gain: 200.00) -20C bin 1x1
Astronomik Deep-Sky B: 20x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky G: 20x60" (gain: 0.00) -20C bin 1x1
Astronomik Deep-Sky R: 20x60" (gain: 0.00) -20C bin 1x1
Astronomik Ha 6nm 1.25'': 1108x120" (gain: 200.00) -20C bin 1x1

Integration: 45.4 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 22.68 days

Avg. Moon phase: 34.63%

Bortle Dark-Sky Scale: 7.80

Basic astrometry details job: 3444322

RA center: 8h 54' 14"

DEC center: +8° 53' 38"

Pixel scale: 1.106 arcsec/pixel

Orientation: 88.451 degrees

Field radius: 0.517 degrees

Resolution: 2664x2060

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


I hope all of you are doing well and staying safe. We have a saying here; April Showers Bring May Flowers. We haven't had too many clear nights during our Shelter in Place order here in Michigan, which has been a major bummer. Even with the amount of integration time I did, it was super faint and had to really push the data. The RGB data was just for the stars.

Abell 31 (also known as Sh2-290) is a planetary nebula of nearly ten light-years wide, located about 2,000 light-years away from Earth in the constellation of Cancer. Although it is one of the largest planetary nebulae of the sky, Abell 31 is not very bright. Its central star is a tiny white dwarf (about 4 times bigger than Earth or about 0.04 times the size of the Sun), which is incredibly hot, about 85,000° Celsius (150,000°F). It has about half the mass of the Sun, meaning it probably started out life as a star with about twice the mass of our Sun, and lost the rest as it aged and its stellar winds blew its outer envelope away. Judging from how fast those winds are blowing outward, the star probably started dying about 130,000 years ago, after a billion or more years of normal life.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


Abell 31 • Sh2-290 Planetary Nebula in HaOIIIRGB, 


            Douglas J Struble

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Sharpless2 Objects