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Contains:  NGC 7510
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The Lobster Claw Nebula, SH2-157, 


            Steven Bellavia
The Lobster Claw Nebula, SH2-157

The Lobster Claw Nebula, SH2-157

Technical card

Resolution: 5000x3100

Dates:Aug. 28, 2019

Astronomik 6nm OIII: 24x300" (gain: 100.00) -15C bin 1x1
Optolong 7nm Ha 2": 26x300" (gain: 100.00) -15C bin 1x1

Integration: 4.2 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 27.28 days

Avg. Moon phase: 5.61%

Bortle Dark-Sky Scale: 1.50

Mean SQM: 21.60

Temperature: 10.00 job: 2899406

RA center: 23h 14' 36"

DEC center: +60° 6' 14"

Pixel scale: 1.358 arcsec/pixel

Orientation: 269.895 degrees

Field radius: 1.110

Data source: Traveller


Sharpless 157, also known as the Lobster Claw Nebula, is a bright emission nebula in the constellation Cassiopeia. It lies just south of the better-known Bubble Nebula (NGC 7635). Within this image are a few other objects. Planetary Nebula PLN 110-0.1 is located near the center of the upper-right quadrant. The bright nebular spot near the center of the image is Lyn's Bright Nebula 537 (LBN537), also known as Sharpless 157a. The small cluster of stars just above the bottom pincer is Markarian 50 and the bright cluster of stars located above the top pincer is open cluster NGC 7510. The northern part of the cloud has a ring shape, caused by the action of the stellar wind of several giant stars, while the southern sector appears excited by the light radiation of the stars of spectral class O.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


The Lobster Claw Nebula, SH2-157, 


            Steven Bellavia