Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  IC 1590  ·  LBN 611  ·  LBN 615  ·  LBN 616  ·  LBN 621  ·  NGC 281  ·  Sh2-184
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Pacman Nebula in SHO, Rob Foster
Pacman Nebula in SHO, Rob Foster

Pacman Nebula in SHO

Revision title: Less aggressive stretching, SHO "SuperLum", and Bill Blanshan and Mike Cranfield's SHO Normalization

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Pacman Nebula in SHO, Rob Foster
Pacman Nebula in SHO, Rob Foster

Pacman Nebula in SHO

Revision title: Less aggressive stretching, SHO "SuperLum", and Bill Blanshan and Mike Cranfield's SHO Normalization

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Description

Also known as NGC 281, IC 11 or Sh2-184, the Pacman Nebula includes a number of interesting features, including embedded Bok globules as well as an open cluster (IC 1590), and is located 9200 ly from earth in the Perseus Spiral arm of the Milky Way Galaxy.  In this field of view, the annotated image did not reveal a lot of interesting detail so I thought it would be more enjoyable to compare the first version( RGB) to the NB image in a modified SHO palette in Version B then the additional NB data added in this final version.

Comments

Revisions

  • Pacman Nebula in SHO, Rob Foster
    Original
  • Pacman Nebula in SHO, Rob Foster
    B
  • Pacman Nebula in SHO, Rob Foster
    D
  • Final
    Pacman Nebula in SHO, Rob Foster
    E
  • Pacman Nebula in SHO, Rob Foster
    F

B

Title: Modified SHO color palette, normalized with Bill Blanshan and Mike Cranfield process

Description: The first iteration of SHO was not particularly appealing, but after normalizing with the process developed by Bill Blanshan and Mike Cranfield, the colors were a lot more vibrant and interesting.

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D

Title: Addition of additional 2 nights of NB data (with correct stars)

Description: Not sure how I missed this, but I somehow forgot to include two complete nights of narrowband data in WBPP the first time around, so this 3rd version represents the addition of more than 4 hours of Ha and Sii and 8 hours of OIII to the original NB image. Correct star orientation in this version (versus previous C, which was deleted).

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E

Title: Less aggressive stretching, SHO "SuperLum", and Bill Blanshan and Mike Cranfield's SHO Normalization

Description: I was never happy with the previous versions; the last one was overstretched trying to tease out nebulosity that I didn't have enough exposure time to merit. This time, a more gentle stretch was done, then creating a synthetic Super Lum image intigrating the SHO channels to blend back in. Bill and Mike's excellent SHO Normalization process really helped with a much better starting point after narrowband combination. I also improved the RGB version, which can be seen with the mouse-over version. Special thanks to @Marc Whitsett for pointing out the link for updating the base mouseover image from the original at https://welcome.astrobin.com/features/image-revisions?_ga=2.158239738.154802049.1704424841-1656722149.1654356428. No need to delete earlier versions! @Adam

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F

Title: Improved RGB Version, same approach with less aggressive stretching

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Pacman Nebula in SHO, Rob Foster

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