Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)  ·  Contains:  NGC 7510
The Claw Nebula Sh2-157 (Ha + O3 + RGB), 


            Scott Davis
The Claw Nebula Sh2-157 (Ha + O3 + RGB)
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The Claw Nebula Sh2-157 (Ha + O3 + RGB)

Technical card

Imaging telescopes or lenses: Explore Scientific ED102 APO

Imaging cameras: Canon EOS Rebel T3i

Mounts: Celestron CGEM Hypertuned

Guiding telescopes or lenses: Orion ShortTube 80

Guiding cameras: Orion StarShoot Autoguider

Focal reducers: Astro-Tech AT2FF

Software: Sequence Generator Pro  ·  DeepSkyStacker  ·  Photoshop CS6  ·  Scott Davis AAPPS

Filters: Astronomik 12nm OIII Clip-In Filter  ·  Astronomik 6nm Ha Clip-In Filter  ·  One-Shot Color

Accessory: Robofocus  ·  Home Made Peltier Cooler for T3i

Dates:Oct. 24, 2014Oct. 25, 2014Oct. 26, 2014Oct. 27, 2014Oct. 28, 2014Oct. 29, 2014Nov. 15, 2014

Astronomik 12nm OIII Clip-In Filter: 221x180" (11h 3') ISO1600
Astronomik 6nm Ha Clip-In Filter: 196x300" (16h 20') ISO1600
One-Shot Color: 53x150" (2h 12' 30") ISO1600

Integration: 29h 35' 30"

Darks: 40

Flats: 40

Flat darks: 40

Bias: 40

Avg. Moon age: 5.92 days

Avg. Moon phase: 17.20%

Bortle Dark-Sky Scale: 6.43

Basic astrometry details

Astrometry.net job: 413063

RA center: 23h14m43s

DEC center: +60°0408

Pixel scale: 2.129 arcsec/pixel

Orientation: -90.471 degrees

Field radius: 1.068 degrees

Resolution: 620x415

Locations: My Backyard, Clovis, California, United States; Eastman Lake Recreation Area, Raymond, CA, United States


The Claw Nebula, catalogued as Sh2-157, is a large but faint emission nebula in the constellation Cassiopeia. Also visible in this image, at lower right, is the easily-recognizable open cluster NGC 7510. The nebula is very close in the sky to the Elephant Trunk Nebula.

RGB color data was captured from Eastman Lake Recreation Area. The Hydrogen-Alpha and Oxygen-III narrowband data was captured from my backyard in Clovis, California.


Sky plot

Sky plot


The Claw Nebula Sh2-157 (Ha + O3 + RGB), 


            Scott Davis