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The Skull Nebula (Caldwell 49), 


            Isaac Garfinkle
The Skull Nebula (Caldwell 49)
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The Skull Nebula (Caldwell 49)

Technical card

Imaging telescopes or lenses: Sky-Watchter Esprit 120

Imaging cameras: ZWO ASI1600MM-P

Mounts: Sky-Watcher AZ-EQ6 GT

Guiding telescopes or lenses: ZWO OAG

Guiding cameras: ZWO ASI290MM Mini

Focal reducers: Starizona Apex-L ED 0.65x Reducer

Software: Pixinsight 1.8

Filters: Astronomik Ha 6nm  ·  Astronomik Sii 6nm  ·  Astronomik Oiii 6nm

Astronomik Ha 6nm: 39x600" (gain: 139.00) -15C bin 1x1
Astronomik Oiii 6nm: 30x600" -15C bin 1x1
Astronomik Sii 6nm: 38x600" bin 1x1

Integration: 17.8 hours

Bortle Dark-Sky Scale: 2.00

Basic astrometry details

Astrometry.net job: 4054002

RA center: 6h 32' 10"

DEC center: +4° 57' 3"

Pixel scale: 1.395 arcsec/pixel

Orientation: 8.534 degrees

Field radius: 1.080 degrees

Resolution: 3370x4440

Data source: Backyard


It’s 2020 and I think we can all agree that the “Skull Nebula” is much better name for this target. This data has been bugging me since I first processed it, but it was originally captured almost 10 months ago back in February 2020 (meaning this data is older than my son)! I never realllly felt like I did it justice, but everything in this version feels better from the color to the details to the noise levels. Sometimes you just need to take a (VERY long) break from something in order to do it right, and a fresh pair of eyes were just what the astro-doctor ordered in this case. All the processing was done in Pixinsight and Photoshop, with image acquisition done in Prism v10.

Image data:
Sky-Watcher Esprit 120
Starizona APEX-L 0.65x Focal Reducer
Dark Frame Optics StellarDrive AZ-EQ6
ZWO ASI1600mm-p
Astronomik 6nm Ha/Oiii/Sii Filters:
H-alpha = 600sec x 39
Oiii: 600sec x 32
Sii: 600sec x 38

Bortle 1-2 Skies



Isaac Garfinkle
License: None (All rights reserved)

Sky plot

Sky plot


The Skull Nebula (Caldwell 49), 


            Isaac Garfinkle