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Sh2-200 • The Bear Claw Nebula in HOO

Technical card

Resolution: 2616x3273

Dates:Oct. 18, 2019Oct. 20, 2019

Astrodon Ha 5nm: 453x120" (gain: 200.00) -20C bin 1x1
Astrodon OIII 3nm: 514x120" (gain: 200.00) -20C bin 1x1

Integration: 32.2 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 20.10 days

Avg. Moon phase: 70.65%

Bortle Dark-Sky Scale: 7.00 job: 3256300

Locations: Backyard White Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


HDW 2 (Hartl-Dengl-Weinberger 2), also known as Sharpless 2-200 or PNG 138.1+04.1, is a quite old planetary nebula (PN) in the constellation Cassiopeia. The nebula is also called "The Bearclaw Nebula".

The bright part of the object has a diameter of about 6'. According to W. A. Weidmann and R. Gamen, who have examined the central stars of different PNs, the central star of HDW 2 is a binary star.

Interestingly there is a larger outer halo around the brighter part of the nebula but it is very faint and needs the exposure time to capture it.



Douglas J Struble
License: None (All rights reserved)


Sh2-200 • The Bear Claw Nebula in HOO, 


            Douglas J Struble

In these public groups

Sharpless2 Objects