Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  9 Cas  ·  LBN 576  ·  PGC 2796252  ·  PK116+00.1  ·  The star 9 Cas
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CTB1 The Medulla Nebula, Jeff Reitzel
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CTB1 The Medulla Nebula

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CTB1 The Medulla Nebula, Jeff Reitzel
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CTB1 The Medulla Nebula

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Description

The Medulla Nebula - CTB1. Initially discovered in 1955 by George Abell who mistakenly cataloged it as a planetary nebula giving it an alternate designation of Abell 85. It is actually an extremely faint shell expanding from a massive supernova toward Cassiopeia that occured around 10,000 years ago. Usually seen as deep red from the dominant Hii, it actually has significant contributions from Sii and Oiii seen as the faint yellow and blue glow around the shell. It also glows strongly with x-ray emissions. Current hypothesis is that a very energetic pulsar was also created with the supernova explosion causing the x-rays and extremely faint glow of the surrounding material.

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CTB1 The Medulla Nebula, Jeff Reitzel