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On this page I collect my observations of the galactic emission nebula Sh2-157 (Lobster Claw Nebula) in constellation Cassiopeia (at the border to Cepheus).
The galactic emission nebula Sh2-157 (Lobster Claw Nebula) in constellation Cassiopeia is large and faint and resembles a lobster claw on photos, hence its name. It was cataloged by the astronomer Stewart Sharpless in his catalog of nebulae published in 1959.
The Dwarf mini mosaic also shows the nebula NGC 7635 (Bubble Nebula), part of the open star cluster M 52, the nebula NGC 7538 nebula (Northern Lagoon Nebula), the open star cluster NGC 7510 near the Lobster’s Claw, and the emission nebula (H II region) Sh2-159 and the emission nebula Sh2-161 (partially).
| Sh2-157 (Lobster Claw Nebula) | NGC 7635 (Bubble Nebula) | NGC 7538 (Northern Lagoon Nebula, Sh2-158) | NGC 7510 | |||
| Size: 60' x 50' (SkySafari) Distance: 8,000-9,000 light years (diverse sources) Rating: --- |
Size: 15' x 8' (Wikipedia) Distance: 8,800 (Wikipedia) Rating: * (Stoyan) |
Size: 9 x 6' (Wikipedia) Distance: 9,900 (Wikipedia) Rating: --- |
Size: 7' (Wikipedia) Distance:11,400 (Wikipedia) Rating: --- |
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| M 52 (NGC 7654) | Sh2-159 | Sh2-161 | ||||
| Size: 10' (Stoyan) Distance: 4,600 light years (Stoyan) Rating: *** (Stoyan) |
Size: 7' (Google) Distance: 9,700-10,000 (Google) Rating: --- |
Size: 44' x 44' (Google) Distance: 9,130 light years (Google) Rating: --- |
The galactic emission nebula Sh2-157 (Lobster Claw Nebula) in constellation Cassiopeia (Image Courtesy of SkySafari Astronomy, www.simulationcurriculum.com)
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Sh2-157, Oct 14, 2026 - original, mosaic, 2 h, DuoBand Filter |
Sh2-157, Oct 14, 2026 - original, mosaic, 2 h, DuoBand Filter |
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Sh2-157, Oct 14, 2026 - original, annotated with skysolver.app |
Sh2-157, section with NGC 7510, Oct 14, 2026 - original, annotated with skysolver.app |
