Hemisphere:  Northern  ·  Constellation: Auriga (Aur)  ·  Contains:  PK172+00.1
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Abell 9 Planetary Nebula, 


            Jerry Macon
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Abell 9 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. 25, 2020Sept. 26, 2020

Astrodon 36mm Ha (5nm) OIII (5nm): 47x300" (gain: 200.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 158x20" (gain: 200.00) -15C bin 1x1

Integration: 4.8 hours

Avg. Moon age: 9.30 days

Avg. Moon phase: 69.69%

Bortle Dark-Sky Scale: 3.00

Temperature: 12.50

Astrometry.net job: 4130041

RA center: 5h 28' 56"

DEC center: +36° 3' 5"

Pixel scale: 0.442 arcsec/pixel

Orientation: 89.133 degrees

Field radius: 0.188 degrees

Resolution: 2526x1723

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

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Abell 9 is an almost never imaged plantary nebula located in Auriga. It is easy to see why. It is very small, only .67 arcminute in diameter, and exceptionally dim, listed at magnitude 18.9. Individual subs of Ha and Oiii do not show a hint that anything is there. But it is. A very interesting structure. A prominent red horseshoe of Ha partly surrounding a uniform field of blue Oiii. Very striking. A worthy target if you like a challenge.


Sky plot

Sky plot


Abell 9 Planetary Nebula, 


            Jerry Macon