Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  The star 9Cas
Abell 85 in SHO_RGB, Michael J. Mangieri
Abell 85 in SHO_RGB
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Abell 85 in SHO_RGB

Abell 85 in SHO_RGB, Michael J. Mangieri
Abell 85 in SHO_RGB
Powered byPixInsight

Abell 85 in SHO_RGB

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Description

This is Abell 85/CTB 1 which is a nearby supernova remnant with an apparent diameter of about a half a degree. For perspective that is the same size as a Full Moon. Originally CTB1 was thought to be a planetary nebula, so Abell included it in his catalog of planetary nebulae as Abell 85. This is a full SHO (Hubble Palette), hence the golden color throughout. Many astrophotographers here on Astrobin have claimed that the Sii signal was rather weak, but I found that it was almost as strong as the Ha signal, so I imaged this with all three filters.

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Abell 85 in SHO_RGB, Michael J. Mangieri