Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  PK138+04.1  ·  Sh2-200
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The Bear Claw Nebula, 


            Gabe Shaughnessy
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The Bear Claw Nebula

Imaging telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Imaging cameras: Quantum Scientific Imaging QSI 690 WSG-8

Mounts: Astro-Physics AP1100GTO

Guiding telescopes or lenses: Teleskop Service ONTC 10" f4 Newton

Guiding cameras: Starlight Xpress Ultrastar

Focal reducers: Televue Paracorr Type-2

Software: PixInsight  ·  Voyager  ·  Astro-Physics Command Center (APCC) Pro Software  ·  PHD2

Filters: Astrodon Ha 5nm  ·  OIII 3nm

Accessory: Pegasus Astro Ultimate Powerbox v2  ·  Starlight Instruments Focuser Boss 2 HSM

Dates:Aug. 30, 2020Sept. 20, 2020

Chroma Ha 3nm: 17x900" bin 1x1
Chroma OIII 3nm: 23x900" bin 1x1

Integration: 10.0 hours

Avg. Moon age: 7.85 days

Avg. Moon phase: 52.98%

Astrometry.net job: 3888884

RA center: 3h 10' 57"

DEC center: +62° 46' 54"

Pixel scale: 0.658 arcsec/pixel

Orientation: -2.957 degrees

Field radius: 0.328 degrees

Resolution: 2830x2199

Data source: Backyard


The Bear Claw Nebula is an ancient planetary nebula in the constellation Cassiopeia. Its age makes its size fairly large due to continued expansion and its surface brightness is quite low.