Hemisphere:  Southern  ·  Contains:  NGC 246
NGC 246 - The Skull Nebula, 


            Terry Robison
NGC 246 - The Skull Nebula
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NGC 246 - The Skull Nebula

Technical card

Imaging telescopes or lenses: RC Optical Systems RCOS 10" Ritchey-Chrétien

Imaging cameras: SBIG STL-11000M

Mounts: AP900GTO Astro Physics

Guiding telescopes or lenses: RC Optical Systems RCOS 10" Ritchey-Chrétien

Guiding cameras: SBIG Remote Guide Head

Filters: Baader OIII Narrowband 8,5nm CCD-Filter 2" OIII 8,5nm 2''  ·  Baader Planetarium H-a  ·  Astrondon Astrodon

Accessory: FLI CW2-7 Filter wheel 7  ·  SBIG AO-L  ·  SBIG Remote Guide Head

Basic astrometry details

Astrometry.net job: 3251765

RA center: 0h 47' 3"

DEC center: -11° 52' 15"

Pixel scale: 0.804 arcsec/pixel

Orientation: 185.699 degrees

Field radius: 0.235 degrees

Resolution: 1752x1168

Data source: Own remote observatory

Remote source: Non-commercial independent facility


This happy little fellow is the planetary nebula NGC 246 discovered by William Herschel in 1785. The Skull Nebula is located in the constellation Cetus. From our vantage point, it has an angular resolution of just 3.7 arcmin. The estimated diameter is about 2.3 light-years, and is 1,600 light-years from our planet. It has a fairly low surface brightness at around 11th magnitude. Quite often, visual observers can find the foreground stars overpowering when trying to locate this planetary nebula. The central star is fairly bright at 11.8 magnitude. The eastern limb of the nebula is brighter suggesting that it is interacting with the interstellar medium. This is an excellent example of how some objects exhibit bow waves truly reflecting the dynamics of the interstellar medium.

I tried to capture the ethereal shell of this planetary nebula. It reminds me of a crystal sphere just hanging in space. The teal and red colours of the planetary really seem to add an element of extra depth to the image.

10 Inch RCOS fl 9.1
Astro Physics AP-900 Mount
SBIG STL 11000m
FLI Filter Wheel
Astrodon Lum, Red, Green, Blue Filters
Baader Planetarium H-alpha 7nm Narrowband-Filter
Baader Planetarium O-III 8.5 Narrowband-Filter

Exposure Details:
62 X 900 Bin 1X1 Lum
25 X 450 Bin 2X2 Red
22 X 450 Bin 2X2 Green
20 X 450 Bin 2X2 Blue
5 X 900 Bin 1X1 Ha
10 X 900 Bin 1x1 OIII

Australia, Central Victoria

Thanks for looking.



Terry Robison
License: None (All rights reserved)

Sky plot

Sky plot


NGC 246 - The Skull Nebula, 


            Terry Robison