Hemisphere:  Southern  ·  Constellation: Hydra (Hya)  ·  Contains:  Sh2-313
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Abell 35, 


            Rodney Watters
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Technical card

Imaging telescopes or lenses: Tak TSA120

Imaging cameras: QSI 683 ws-8

Mounts: EQ8

Guiding telescopes or lenses: ZWO Off Axis Guider

Guiding cameras: Starlight Xpress Lodestar x2

Focal reducers: Takahashi TOA Reducer .75x

Software: Pixinsight 1.8

Filters: Astronomik Ha 1.25" 6nm  ·  Astronomik OIII 1.25" 6nm  ·  Astronomik Red  ·  Blue  ·  Green

Dates:April 6, 2018April 8, 2018April 24, 2018May 5, 2018May 13, 2018

Blue: 24x300" -20C bin 1x1
Green: 24x300" -20C bin 1x1
Astronomik Ha 1.25" 6nm: 41x1800" -20C bin 1x1
Astronomik OIII 1.25" 6nm: 42x1800" -20C bin 1x1
Astronomik Red: 24x300" -20C bin 1x1

Integration: 47.5 hours

Darks: ~30

Flats: ~48

Bias: ~100

Avg. Moon age: 19.83 days

Avg. Moon phase: 52.33%

Astrometry.net job: 2104894

RA center: 12h 53' 30"

DEC center: -22° 52' 6"

Pixel scale: 1.645 arcsec/pixel

Orientation: 92.847 degrees

Field radius: 0.655 degrees

Resolution: 2259x1767

Locations: Glanmire Home Observatory, Bathurst, NSW, Australia

Data source: Backyard


Abell 35 (Sharpless 2-313) is catalogued as a planetary nebula (PN) in the constellation of Hydra. I say "catalogued" here as there has been research completed from which the authors conclude that this object is not in fact a PN. Notwithstanding the research, it is an interesting object and relatively large for a PN (if that's what it is) at 16' x 11'. It makes for a difficult object to process as the surface brightness is quite low, hence the reason for spending additional time gathering data for this one - particularly with the OIII band. There was no SII noticed to speak of so I did not spend the time gathering SII data. There is a good description of this object on the Astrodon web site via this link: https://astrodonimaging.com/gallery/abell-35/


Sky plot

Sky plot


Abell 35, 


            Rodney Watters