Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  9 Cas  ·  PK116+00.1  ·  The star 9Cas
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CTB-1 SNR, Graham Roberts
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Getting plate-solving status, please wait...
CTB-1 SNR, Graham Roberts
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Description

Revised in 1971 as a supernova remnant (SNR) and renamed CTB-1, thus also denoting it as a radio source.  The overall structure is a circular shell with a conspicuous rupture towards the north (bottom right of image).  The main red Ha-shell is composed of multiple interlocking filament limbs, with a blue / green OIII arc along one side.

Total integration time: 29 hours
Ha 29 @ 1800 sec
OIII 20 @ 1800 sec
18 x RGB @ 300 sec

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CTB-1 SNR, Graham Roberts