CTB 1 Supernova Remnant

CTB 1 Supernova Remnant

Abell 85

Constellation: Cassiopeia
Ra: 23h 59m 54s
Dec: +62d 26m 51s
Distance: 10,000 light years
Image Size: 35' x 30'
North: Up



CTB 1 (Abell 85) is a faint, closeby supernova remnant (SNR) in the constellation of Cassiopeia at RA 23h 59m 54s and DEC +62d 26m 51s. The field presented is 36′ wide, which barely covers the object. North is up.

It was identified as a SNR by van den Bergh et al. in 1972 based upon its optical half-circular shape consisting of radiative filaments. Deeper images taken in H-alpha by Fesen (1993) show that it has a complete circular shape (as shown in my image above) except for the unusual breakout structure toward the northeast, which also shows up in X-Ray images. Distance and age estimates are 10,000 light years, and 7,500 – 11,000 years, respectively. It spans nearly 100 light years.
The structure of CTB 1 is quite similar to my image of Sh2-308, in that it is also circular with many filaments and a breakout region. Sh2-308 is considered to be a Wolf-Rayet bubble in a pre-supernova developmental phase. The breakout region of CTB 1 is a referred to as a "shell rupture" and extends 30′ toward the east.
Detail in this high-resolution image comes from using narrowband H-a and OIII filters. H-a was color mapped to red/magenta and OIII to blue-green. RGB data were added using a G2V white point.

Exposure: 15.67hrs Total: 7 hrs OIII, 7 hrs H-a, 1.67 hrs RGB
Telescope: RCOS 16
Mount: Software Bisque Paramount ME
Oag: Astrodon MonsterMOAG
Acquisition: CCDAutoPilot4
Calibration: CCDStack2
Observatory Site: Sierra-Remote Observatories, Shaver Lake, CA
Camera: Apogee U16M
Filters: Astrodon Gen 2 RGB, 3nm H-a, OIII
Guider: SBIG ST-402
Camera Operation: MaximDL5.15
Processing: Photoshop CS5 Extended
Image Date: 07/27/2011 - 08/02/2011

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