Crescent Nebula (NGC6888) & Soap Bubble (Mostly narrowband, 20+ hours)

The Crescent Nebula is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792.

 

I've been imaging the Crescent Nebula area over the last week when I got clear nights. I managed to get 5 nights with an average of 4+ hours each night, for an integration time over 20 hours. This is by far the longest integration time I've ever acquired. I wanted to experiment with longer integration times with an OSC camera (ASI2600MC Pro).

 

I used the FLT132 with the FLAT8 reducer (0.72x) to get a slightly wider field of view; it just about includes the Soap Bubble at the top left(ish) corner. I also used a combination of narrowband filters (Optolong L-Ultimate 3nm Ha & Oiii, IDAS NBZ and Antlia ALP-T 5nm Ha & Oiii) as well as a more broadband filter, Antlia Triband RGB Ultra. I think the combination of all the filters provides a more balanced set of colours, including a decent amount of Oiii detail in the Crescent Nebula.

 

Processed in PixInsight and Affinity Photo 2.

 

More acquisition details in Astrobin: astrob.in/08co9c/0/

 

Thanks for looking!

 

CS

Eduardo

Done