gorann Posted January 2 Share Posted January 2 CTA 1 is a rarely imaged supernova remnant (aka SNR G119.5+10.2) in Cepheus, consisting of a 1.5 degree filamentary shell, so quite large. However, it is extremely faint and my first attempt to image it during a moonlit night using NBZ dual-band filter was not very successful., although the result was interesting enough to merit a second attempt when the moon was gone. So this is the second attempt. The bright object near the center is NGC 40, a small planetary nebula. However, they are not interacting but only happen to be on the same line of sight. The distance to CTA 1 is estimated about 4600 light years and its age is about 10’000 years. NGC 40 is about 3500 light years away from us and 4,500 years old. CTA 1 occur in the first list of radio sources published by the CalTech Observatory in 1960, hence the annotation CTA. Imaged on the night 26-27 Dec with a RASA8 and ASI2600MC with IDAS NBZ (Ha+Oiii) filter on a Mesu 200 mount. 62 x 5 min, so about 5 hours. Processed in PS and PI. Processing was a challenge and I had to work on a starless version (Star Xterminator) to bring out as much of the faint nebulosity as possible. Cheers & CS, Göran Here is a link to my first attempt a week earlier: 14 Link to comment Share on other sites More sharing options...
MartinB Posted January 4 Share Posted January 4 Stunning image Goran. A dramatic improvement on the already excellent first image. 1 Link to comment Share on other sites More sharing options...
gorann Posted January 4 Author Share Posted January 4 25 minutes ago, MartinB said: Stunning image Goran. A dramatic improvement on the already excellent first image. Thanks a lot Martin for the kind words and for moving this post to the right Forum! CS, Göran Link to comment Share on other sites More sharing options...
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