|Here is a work in
progress. I've added another three hours to the exposure so I
was able to be more aggressive with the stretch. This shot was taken
from my urban driveway
on the edge of a red zone with bortle 6 to 7 skies.
This one is a target on my challenge list as it is extremely faint with very low contrast compared to the sky background. CBT-1 or Abell 85 is a supernova remnant (SNR) in Cassiopeia. This SNR was cataloged by George Abell as a planetary nebula in his now well-known catalogue as Abell 85 but it was suggested by van den Bergh in 1960 and later confirmed by Willis & Dickel in 1971 to be a supernova remnant. CTB 1 is approximately 9784 light years away and physically spans another 98 light years in diameter while it is dated to be approximately 10,000 years old. In the full field image the remnant is about the same size as the full Moon.
This version adds another 120 minutes to the exposure and as a result I was able to dial the noise reduction back a bit preserving more detail. The rich star field presents a challenge for star reduction, fortunately Images Plus has a great function for this.
Click on the image to see a higher resolution version of the data. Click again to return to this view.