Hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)
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HFG1 and Abell 6 (PK 136+4.1), 



    
        

            snakagawa
HFG1 and Abell 6 (PK 136+4.1)
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HFG1 and Abell 6 (PK 136+4.1), 



    
        

            snakagawa
HFG1 and Abell 6 (PK 136+4.1)
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Technical card


Basic astrometry details

Astrometry.net job: 1712066

RA center: 3h 1' 48"

DEC center: +64° 49' 40"

Pixel scale: 2.211 arcsec/pixel

Orientation: 0.504 degrees

Field radius: 1.082 degrees


Resolution: 2751x2201

Description

HFG1 (Heckathorn-Fesen-Gullis 1) is a very faint and large (huge), ancient planetary nebula in Cassiopeia, with almost no Sii, small Ha, and a moderate amount of Oiii emissions. The more stereotypical, "bubble"-shaped Abell 6 has both Ha and Oiii. Note a bow shock surrounding HFG1 and a faint Ha tail. As other postings at AB and other sites commented, this has turned out to be one of the most difficult imaging I have done so far with C8 Hyperstar 3 (stopped down to F/3) +Atik460ex+5nm Astrodon filters. Shot over 3 nights in an unusually hazy October sky (2015) from Grandview Campground, Inyo, CA. Ha, Oiii, and Sii were used to generate both HST and synthetic natural color palette images, which were blended and used.

Exposure data:
Ha: 10 min x 68 (11 hours 20 min)
Oiii: 10 min x 33 (5 hours 30 min)
Sii: 10 min x 18 (3 hours)

Processed using Pixinsight+Imagesplus+Adobe Photoshop+Startools

Comments

Revisions

  • HFG1 and Abell 6 (PK 136+4.1), 



    
        

            snakagawa
    Original
  • Final
    HFG1 and Abell 6 (PK 136+4.1), 



    
        

            snakagawa
    B

B

Description: Reprocessed image from 2015

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Sky plot

Sky plot

Histogram

HFG1 and Abell 6 (PK 136+4.1), 



    
        

            snakagawa