HDW2 (Sharpless 2-200) "Bearclaw" nebula (snakagawa)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas)

Image of the day 10/12/2017

HDW2 (Sharpless 2-200) "Bearclaw" nebula, snakagawa

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HDW2 (Sharpless 2-200) "Bearclaw" nebula

Link to TIFF/FITS: https://www.flickr.com/photos/15564379@N06/37391133292/in/dateposted/

Image of the day 10/12/2017

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HDW2 (Sharpless 2-200) "Bearclaw" nebula

Link to TIFF/FITS: https://www.flickr.com/photos/15564379@N06/37391133292/in/dateposted/

HDW2 (Hartl-Dengl-Weinberger 2; )is a large and faint, ancient planetary nebula in Cassiopeia. It is located very close to another large faint and ancient PN HFG1. I do not know any common name for this nebula, so I'd call it the "Bearclaw nebula" from its surface texture. The center part is rich in Oiii (and some Ha), and the surrounding halo in Ha. There is little Sii in this target.

C8+ Hyperstar 3 with an aperture mask (stopped down to F/3). Atik 460ex mono. Astrodon 5nm filters. Exposure info is as follows:

Ha: 10 min x 65

Oiii: 10 min x 46

Sii: 10 min x 19

Granview Campground, INYO California. Shot over 3 nights in very good seeing. Transparency was (as usual) good to above average.

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Image of the day 10/12/2017

HDW2 (Sharpless 2-200) "Bearclaw" nebula

Image of the day 10/12/2017

HDW2 (Sharpless 2-200) "Bearclaw" nebula

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HDW2 (Sharpless 2-200) "Bearclaw" nebula

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HDW2 (Sharpless 2-200) "Bearclaw" nebula

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