Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  PK017-10.1
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Abell 51 Planetary Nebula, 


            Jerry Macon
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Abell 51 Planetary Nebula

Imaging telescopes or lenses: Orion Optics UK AG12

Imaging cameras: ZWO ASI178MM-Cool

Mounts: Paramount MEII with Absolute Encoders

Guiding telescopes or lenses: Orion Optics UK AG12

Guiding cameras: Starlight Xpress Lodestar X2 Mono

Software: Nighttime Imaging ‘N’ Astronomy N.I.N.A.  ·  PixInsight 1.8  ·  PHD Guiding 2

Filters: Astrodon 36mm Ha (5nm) OIII (5nm)  ·  Astrodon Gen 2 RGB 36mm

Dates:Sept. 20, 2020Oct. 4, 2020

Astrodon 36mm Ha (5nm) OIII (5nm): 39x300" (gain: 200.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 226x20" (gain: 200.00) -15C bin 1x1

Integration: 4.5 hours

Avg. Moon age: 10.31 days

Avg. Moon phase: 53.62%

Bortle Dark-Sky Scale: 3.00

Temperature: 5.00

Astrometry.net job: 4197543

RA center: 19h 1' 1"

DEC center: -18° 12' 15"

Pixel scale: 0.442 arcsec/pixel

Orientation: -90.458 degrees

Field radius: 0.213 degrees

Resolution: 2888x1932

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Imaged on nights of 2020/9/20, 2020/10/1, 2020/10/2, 2020/10/4

Abell 51 is a practically never imaged planetary nebula in Sagittarius. This is the first image on Astrobin, and I found no color images on the web. Abell51 is very small, measuring only 1.1 arc minutes and has a magnitude of 15. It is barely visible on the RGB image, but both Ha and Oiii show fairly well with Oiii about 3 times stronger than Ha. This is everything I could find on the web about this PN. Very obscure. A prominent blue star is centered in Abell51, the apparent source for this PN.


Sky plot

Sky plot


Abell 51 Planetary Nebula, 


            Jerry Macon