Hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  PGC2572662  ·  PGC2573118  ·  PGC2815856  ·  PK158+37.1
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Abell 28 Planetary Nebula, 


            Jerry Macon
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Abell 28 Planetary Nebula

Imaging telescopes or lenses: PlaneWave Instruments CDK14

Imaging cameras: ZWO ASI6200MM-PRO

Mounts: Paramount MEII with Absolute Encoders

Software: Nighttime Imaging ‘N’ Astronomy N.I.N.A.  ·  PixInsight 1.8  ·  StarNet++ .

Filters: Antlia RGB 50mm  ·  Antlia Ha 3nm 50mm

Dates:Dec. 15, 2020Dec. 25, 2020

123x30" (gain: 100.00) -15C
Antlia Ha 3nm 50mm: 64x300" (gain: 100.00) -15C bin 1x1

Integration: 6.4 hours

Avg. Moon age: 5.71 days

Avg. Moon phase: 40.86%

Bortle Dark-Sky Scale: 3.00

Temperature: -4.00

Astrometry.net job: 4128794

RA center: 8h 41' 23"

DEC center: +58° 13' 11"

Pixel scale: 0.603 arcsec/pixel

Orientation: 89.542 degrees

Field radius: 0.437 degrees

Resolution: 4320x2934

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

Data source: Own remote observatory

Remote source: Non-commercial independent facility


No dithering.
No guiding.
Fixed focus position (focuser inoperative)

Abell 28 is a planetary nebula in the constellation Ursa Major with very low surface brightness and a diameter of about 5.5 arcmin. The brightness is unevenly distributed over the disk. I have found this to be one of the dimmest PNs I have imaged. The Oiii is basically non-existent, and the Ha is incredibly faint. It took a lot of careful processing to bring it out.


Sky plot

Sky plot


Abell 28 Planetary Nebula, 


            Jerry Macon