Contains:  The star 9Cas
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CTB-1 Pomegranate Super Nova Remnant in Ha, 


            Douglas J Struble
CTB-1 Pomegranate Super Nova Remnant in Ha

CTB-1 Pomegranate Super Nova Remnant in Ha

Technical card

Resolution: 5585x4471

Dates:Aug. 13, 2018Aug. 23, 2018Aug. 27, 2018

Astrodon Ha 5nm: 216x240" (gain: 139.00) -20C bin 1x1
Astrodon Ha 5nm: 332x120" (gain: 201.00) -20C bin 1x1

Integration: 25.5 hours

Darks: ~50

Flats: ~50

Bias: ~250

Avg. Moon age: 10.06 days

Avg. Moon phase: 65.82%

Bortle Dark-Sky Scale: 6.00 job: 2223279

RA center: 359.884 degrees

DEC center: 62.473 degrees

Pixel scale: 1.158 arcsec/pixel

Orientation: 210.489 degrees

Field radius: 1.150 degrees

Locations: Backyard Red Zone Observatory, Taylor, MI, Michigan, United States

Data source: Backyard


Finished off my Ha data on CTB-1, a work in progress. I had to really massage the data, as it is very faint. On to OIII.

CTB1 is a nearby supernova remnant (SNR) with an apparent diameter of about a half a degree (about the same size as a Full Moon). Upon early discovery, CTB1 was thought to be a planetary nebula, so Abell included it in his catalog of planetary nebulae as Abell 85. 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 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.



Douglas J Struble
License: None (All rights reserved)

Sky plot

Sky plot


CTB-1 Pomegranate Super Nova Remnant in Ha, 


            Douglas J Struble