Hemisphere:  Southern  ·  Constellation: Puppis (Pup)
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Abell 23 Lowest DEC of Abell PN Series, 


Abell 23 Lowest DEC of Abell PN Series
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Abell 23 Lowest DEC of Abell PN Series

Imaging telescopes or lenses: Stellarvue SVT 130T

Imaging cameras: SBIG STT 8300M

Mounts: Astro-Physics Mach1AP GTO CP4

Guiding telescopes or lenses: Stellarvue SVT 130T

Guiding cameras: SBIG STT 8300M

Software: Software Bisque TheSky X Professional  ·  photoshop  ·  Starnet ++  ·  CCDWare FocusMax V.4  ·  PixInsight  ·  Straton Destar 2.0  ·  Topaz Denoise AI  ·  3D LUT Creator  ·  Maxim DL  ·  EQMOD  ·  DC-3 Dreams ACP Observatory Control Software  ·  Astro-Physics Command Center (APCC) Software  ·  Annie's Astro Actions Version 7.0

Filters: Astrodon 3nm OIII 31mm

Accessory: Moonlite Nitecrawler 3.5  ·  Tolga Astro Alnitak Flat-Man Electroluminescent Flat Fielding Device

Dates:Feb. 7, 2021

Frames:Astrodon 3nm OIII 31mm: 6x1800" (3h)

Integration: 3h

Avg. Moon age: 25.09 days

Avg. Moon phase: 20.68%

Astrometry.net job: 4211523

RA center: 7h 43' 18"

DEC center: -34° 45' 14"

Pixel scale: 1.220 arcsec/pixel

Orientation: 1.775 degrees

Field radius: 0.120 degrees

Resolution: 500x500

Locations: Stanford Faculty Observatory (Bortle 6 SQM 18.6), Stanford, California, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Original photo shows telescope at maximum pier elevation with roof open. [Note motor on the right with warning to shut down when pier is up. ]

Elevation 18 DEG threading the needle between trees. This is pretty much due south. All I can get is a little on the O-III if Topaz AI applied and severe stretch applied.

If I can check this one off the list, all the rest are at higher DECs.


From Wikipedia:

The Abell Catalog of Planetary Nebulae was created in 1966 by George O. Abell and was composed of 86 entries thought to be planetary nebulae that were collected from discoveries, about half by Albert George Wilson and the rest by Abell, Robert George Harrington, and Rudolph Minkowski. All were discovered before August 1955 as part of the National Geographic Society – Palomar Observatory Sky Survey on photographic plates created with the 48-inch (1.2 m) Samuel Oschin telescope at Mount Palomar. Four were later rejected as not being planetaries: Abell 11 (reflection nebula), Abell 32 (red plate flaw), Abell 76 (ring galaxy PGC 85185), and Abell 85 (supernova remnant CTB 1 and noted as possibly such in Abell's 1966 paper). Another three were also not included in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (SEC): Abell 9, Abell 17 (red plate flaw), and Abell 64. Planetaries on the list are best viewed with a large aperture telescope (e.g. 18-inch (0.46 m)) and an OIII filter.

It turns out to my surprise most of these are visible with my Stellarvue 130mm (5-inch) SVX.

Bottom line there are 79 imagable Abell Nebula of which I have imaged 43 (half-way point Feb 6 2012).

This is my collection:

Planetary Nebula (Abell)

These are sorted by number and behind the Abell's are other miscellaneous PNs that I have imaged... I have a list of the 100 brightest.

These are some useful Abell relevant sites:

Color and IMHO Best Filter Information

Images by Season and More Filter information in German



  • Abell 23 Lowest DEC of Abell PN Series, 


  • Abell 23 Lowest DEC of Abell PN Series, 


  • Final
    Abell 23 Lowest DEC of Abell PN Series, 




Description: Best single image... need X-ray eyes... but plate solves.

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Description: Stacked 5 images stretched and Topaz AI applied.

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Sky plot

Sky plot


Abell 23 Lowest DEC of Abell PN Series,