The Details
Object
Sharpless 2-157 in Cassieopeia
Optics
Takahashi FSQ-106 at f/5
Platform
Astro-Physics 1200 GTO
Camera
SBIG ST-10XME
Filters
Custom Scientific 3nm Hydrogen-Alpha
Date
11 December 2004
Location
Mount Wilson Observatory - Mount Wilson, CA
Exposure
Ha 8 x 1800 sec 1x1 bin
Software
Maxim DL/CCD, Registar, Photoshop
Orientation
Field of View: 01° 37 ’ x 01° 05 ’ centered on RA 23h14m42s
DEC 60°06’29”. North angle 94.81 °; east 90° CCW from north
Notes
This large nebula, straddling the border between Cepheus and Cassiopeia is designated Sharpless 2-157. The bright nebular spot at upper center is Sharpless 2-157a, aka Lynd's Bright Nebula 537. The small cluster of 5-6 stars at a 3:30 o'clock position from Lynd's 537 is Markarian 50. Open cluster NGC 7510 can be seen in the lower right corner of the image. Finally, the elliptical-shaped planetary nebula PLN 110-0.1 is visible in the mid lower left quadrant. The two prominent arcs of this nebula sweeping to the north are reminiscent of a crab's pincer, so I refer to this object as the Crab Claw nebula.

 

 

 

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