Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  NGC 7788  ·  NGC 7790  ·  The star 9 Cas
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LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB, Jonathan Middleton
LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB
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LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB

Getting plate-solving status, please wait...
LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB, Jonathan Middleton
LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB
Powered byPixInsight

LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB

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Description

*Update*: It was brought to my attention that Abell has a Catalogue of Planetary Nebula, but it's inaccurately described in that catalogue as well, so I won't include Abell 85 in the title. 

Interestingly, this supernova remnant (SNR) is often referred as Abell 85, however, the Abell catalogue is a "Catalog of Rich Clusters of Galaxies". NASA defines Abell 85 as a galaxy cluster located 740 mly from earth. The correct name for this object is LBN 576 or CTB-1, depending on which catalogue you are using. It has also been called the Medulla Nebula. This is a shell-type supernova remnant (SNR), much like the Cygnus loop.  H-alpha and Sulfur II were the most pronounced gases being emitted on my test subs, so I focused on collecting those photons with the limited clear skies I have this time of year. The narrowband combination is HSS and I added RGB stars for a more natural look. I was really surprised to see the amazing depth of the shell and surrounding Hydrogen cocoon this SNR seems to be nestled in.

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LBN 576 / CTB-1: The Medulla Nebula in HSS+RGB, Jonathan Middleton