File:Supernova Remnant Abell 85 in HOO - Flickr - astrophotography andy.jpg

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Abell 85 is my longest integration. Over 29 hours of imaging time. Over 18 hours of Ha and 10 Oxygen iii.


Abell 85 or CTB1 is a nearby supernova remnant (SNR) with an apparent diameter of about a half a degree (about the same size as a Full Moon). Upon early discovery, CTB1 was thought to be a planetary nebula, so Abell included it in his catalog of planetary nebulae as Abell 85. Further research showed that CTB1 is, in fact, a supernova remnant.

The deep red color of the SNR comes from light emitted by energized Hydrogen (Ha), but CTB1 also has an area shining in blue/green light from energized Oxygen (OIII) atoms. The surrounding Ha light has been shown to be related to CTB1 as well. CTB1 makes for a very challenging object to photograph, as it is quite faint. Without using Ha and OIII filters, the SNR is virtually invisible.
Date Taken on 18 December 2022, 17:17
Source Supernova Remnant Abell 85 in HOO
Author Astrophoto Andy

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Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

This image was originally posted to Flickr by astrophotography_andy at https://flickr.com/photos/160049573@N04/52572383748. It was reviewed on 4 January 2023 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-zero.

4 January 2023

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current02:14, 4 January 2023Thumbnail for version as of 02:14, 4 January 20233,884 × 2,444 (3.89 MB)Red panda bot (talk | contribs)In Flickr Explore: 2022-12-20

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