Sharpless 157, also known as the Lobster Claw Nebula, is a bright emission nebula that lies in the constellation Cassiopeia. It lies just south of the better-known Bubble Nebula (NGC 7635). Within this image of the Lobster Claw 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.
Telescope: Stellarvue Raptor SVR80 @ f/6
Accessories: Stellarvue SFF6 flattener; Dew control by Dew Buster; Alnitak Flat-Man
Mount: Takahashi EM-200 Temma2
Camera: QSI583wsg CCD @ -10.0C
Guiding: Starlight Xpress Lodestar via PHD
Filters: Astrodon 5nm Ha, OIII, SII
Exposure: 12 x 20min.(Ha), 21 x 20min.(OIII), 11 x 20min.(SII); all binned 1x1
Acquisition: ImagesPlus Camera Control v4.3
Processing: ImagesPlus v5.0
Post-processing: ImagesPlus v5.0; Adobe Photoshop CS5
Date(s): September 9, 10, 18, 19, 2012
Location: Hendersonville, TN, USA