The Popped Balloon nebula, CTB-1 / Abell 85 (Steven Bellavia)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: The star 6 Cas · The star 9 Cas

The Popped Balloon nebula, CTB-1 / Abell 85, Steven Bellavia

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The Popped Balloon nebula, CTB-1 / Abell 85

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The Popped Balloon nebula, CTB-1 / Abell 85

Supernova Remnant CTB-1/Abell-85 is 10,000 light years distant, placed in the constellation Cassiopeia.

It was initially discovered by George Abell and Albert Wilson in 1955 from plates taken by the Palomar Observatory Sky Survey and catalogued as Abell 72. and then later changed to Abell 85. It was originally thought to be a planetary nebula, and why it was cataloged as Abell 72/85. Over ten years later, that same part of the sky was identified by CalTech as a radio source, CTB (Caltech observatory, list B) But it was about another decade later before they realized that Abell 72/85 was the visual part of the supernova remnant radio source CTB-1.

It has an apparent diameter of a half a degree, so the size of a full moon, and it is extremely faint. It also looks like a popped balloon with air leaking out of the side.

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The Popped Balloon nebula, CTB-1 / Abell 85

The Popped Balloon nebula, CTB-1 / Abell 85

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The Popped Balloon nebula, CTB-1 / Abell 85

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