Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  PGC2796827  ·  PGC2796841  ·  PK131+02.1  ·  Sh2-189
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Abell 3 Planetary Nebula, 


            Jerry Macon
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Abell 3 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 5nm Ha filter  ·  AstroDon 5nm Oiii filter  ·  Astrodon Gen 2 RGB 36mm

Dates:Sept. 14, 2020

Astrodon 36mm Ha (5nm) OIII (5nm): 45x300" (gain: 200.00) -15C bin 1x1
Astronomik RGB 2" filter set: 153x20" (gain: 200.00) -15C bin 1x1

Integration: 4.6 hours

Avg. Moon age: 26.22 days

Avg. Moon phase: 11.88%

Bortle Dark-Sky Scale: 3.00

Temperature: 15.00

Astrometry.net job: 4001613

RA center: 2h 12' 9"

DEC center: +64° 9' 3"

Pixel scale: 0.442 arcsec/pixel

Orientation: 89.091 degrees

Field radius: 0.229 degrees

Resolution: 3096x2080

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

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Abell 3 is a Planetary Nebula in the constellation Cassiopeia. It is of medium brightness among the PNs at magnitude 16. Both Ha and Oiii are strongly represented, with close to identical intensities. It is very small with a diameter of 1 arcminute, but is not perfectly round, showing some blockiness, with an unusual banded appearance.
The Ha and Oiii are concentrated at different regions within the circle, so differences can be observed.
This PN is rarely imaged. I found no color images on the web, other than the several already posted on Astrobin. And basically zero info on this PN. Distance is about 8400 ly with a true diameter of 3 ly.
With a dec of 64 degrees at my obs in NM I was able to image this in a single night. Not the norm for these PNs for me.
This image contains a rather striking very large orange-red carbon star.


Sky plot

Sky plot


Abell 3 Planetary Nebula, 


            Jerry Macon