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Contains:  NGC 6818, NGC6818, PK025-17.1
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NGC 6818, 


            Gary Imm
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NGC 6818

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 183MM Pro Cool

Mounts: Astro-Physics Mach1GTO

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: Orion StarShoot AutoGuider Pro Mono

Software: PixInsight  ·  Main Sequence Software Sequence Generator Pro  ·  Stark Labs PHD2 2.6.3

Filters: Astrodon Green 31mm Gen2 I-Series  ·  Astrodon Blue 31mm Gen2 I-Series  ·  Astrodon Red 31mm Gen2 I-Series

Accessory: ZWO EFW  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control

Dates:Oct. 12, 2019

Astrodon Blue 31mm Gen2 I-Series: 40x60" (gain: 111.00) -12C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 40x60" (gain: 111.00) -13C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 40x60" (gain: 111.00) -12C bin 1x1

Integration: 2.0 hours

Avg. Moon age: 13.51 days

Avg. Moon phase: 98.22% job: 2987811

RA center: 19h 43' 57"

DEC center: -14° 9' 11"

Pixel scale: 0.247 arcsec/pixel

Orientation: 165.373 degrees

Field radius: 0.161 degrees

Resolution: 3882x2645

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This object is a tiny but bright planetary nebula located 5000 light years away in the constellation of Sagittarius at a declination of -14 degrees. The nebula spans about 25 arc-seconds in our apparent view, which corresponds to a diameter of about 0.5 light years.

This object doesn't really look like any other PN that I have imaged. Comparing it to the Hubble image, the general structure is similar so I don't think the unique structure is due to any artifacts from my imaging/processing. The nebula is primarily cyan indicating dominant OIII gas outflow, with a slightly reddish interior region indicating the presence of HII. White arcing gas fronts are seen in the interior. A central star looks faintly visible but it is hard to tell for sure.

This object has the nickname of the Little Gem Nebula and I can see its resemblance to a tiny gemstone.



Gary Imm
License: None (All rights reserved)

Sky plot

Sky plot


NGC 6818, 


            Gary Imm