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Sh1-89 (Sharpless 1-89, Moth Nebula, PN G089.8-00.6, PK 089-0.1)

Technical card

Resolution: 2479x1608

Dates:Sept. 26, 2019Oct. 2, 2019Oct. 5, 2019Oct. 11, 2019Oct. 12, 2019Oct. 15, 2019Oct. 16, 2019Oct. 19, 2019Oct. 24, 2019Oct. 25, 2019Oct. 28, 2019Nov. 2, 2019Nov. 3, 2019Nov. 4, 2019Nov. 5, 2019Nov. 6, 2019Nov. 7, 2019Nov. 8, 2019Nov. 9, 2019Nov. 12, 2019Nov. 13, 2019Nov. 14, 2019Nov. 26, 2019

Optolong Blue 1.25": 88x120" (gain: 10.00)
Optolong Green 1.25": 105x120" (gain: 10.00)
ZWO H-alpha 7nm: 232x300" (gain: 10.00)
OIII: 174x300" (gain: 10.00)
Optolong Red 1.25": 98x120" (gain: 10.00)

Integration: 43.5 hours

Avg. Moon age: 13.77 days

Avg. Moon phase: 59.09%

Bortle Dark-Sky Scale: 7.50 job: 3091246

RA center: 318.522 degrees

DEC center: 47.773 degrees

Pixel scale: 0.426 arcsec/pixel

Orientation: 270.568 degrees

Field radius: 0.175 degrees

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard


Sh 1-89 is a small bipolar planetary nebula in Cygnus approximately 6,400 light years away. It was originally included on the Sharpless catalog of emission nebulae but it was left off the revised Sharpless 2 catalog since it was found to be a planetary nebula. Thus, it’s one of only two ‘Sh1 but not Sh2’ objects (along with Sh1-118 in Cassiopeia). This target is faint and small, but it’s not incredibly faint or small - along with the fact that it’s got a lot of interesting structure, I’m surprised it isn’t a more popular target.

I have to say that I'm really happy with how this one came out (especially considering the camera troubles I was having early on when imaging this). Special thanks to Jeremy Sheere and Keith Hanssen for constructive criticism on this one.



Chris Sullivan




Sky plot

Sky plot


Sh1-89 (Sharpless 1-89, Moth Nebula, PN G089.8-00.6, PK 089-0.1), 


            Chris Sullivan