Object: SH2-157 “The Lobster Claw” in HST or SHO Palette (November 2024)
SH2-157 is a large, but faint emission complex in the western part of the constellation of Cassiopeia on the border of Cepheus. Its general shape resembles a New England rock lobster claw., hence its nickname. The nebula is about 11,050 lightyears from Earth in the Perseus arm of the Milky Way galaxy.

Details:
- Acquisition Date: 10/06/2024 to 11/01/2024
- Location: Western Massachusetts, USA
- Imaging Camera: QHY600PH-M -10°C - Mode 1(High Gain) Offset:15 Gain:56
- Telescope: Celestron EdgeHD 11 Celestron 11" Edge HD @f/7
- Focal reducer: Celestron .7x Focal Reducer, for 11 HD
- Mount: Astro-Physics AP1100 w/GTO4
- Guide scope: Celestron Off Axis Guider
- Guide Camera: ASI174m mini
- Software: Adobe Photoshop CS5, Sequence Generator Pro, PixInsight 1.8 Ripley, Aries Astro Pixel Processor

Filters:
- Chroma Ha 3nm 50mm
- Chroma OIII 3nm 50mm
- Astrodon SII 3nm 50mm

Exposure Times:
- Hydrogen Alpha (Ha): 43 x 10min. (430min) bin 1x1
- Oxygen III (OIII):26 x 10min. (260min) bin 1x1
- Sulfur II (SII):25 x 10min. (250min) bin 1x1

Total Exposure:940min. (15.67hr)

Sky Quality:
-Magnitude: 19.71
-Bortle Class 5
-1.41 mcd/m^2 Brightness
-1234.6 ucd/m^2 Artificial Brightness

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