A Ghostly Squid

This one definitely qualifies as DIM! Many have exposed for tens of hours to capture this object. I had attempted this one from the city with very mixed results due to short exposures and light pollution. In order to bring out the Squid with much a shorter exposure, I employed some of the same techniques I used to bring out the star stream surrounding NGC5907. Some very laborious mask building with a lot of blurring and contrast enhancing was used to make the Squid visible in the mask. The mask was then applied to several of the initial stretches to enhance the nebula.

The Squid (Ou4) is a faint reflection nebula at the core of the Flying Bat Nebula (I have no idea how it got that name) SH2-129 in Cepheus. Once considered a challenge object to image, modern equipment and filters make the data relatively easy to capture as can be seen in the four hour exposure below. The real challenge is to tease out the very faint details while processing the data. 

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Object The Squid Nebula OU-4  RA 21:12:20 Dec 60:04:27
Date 9 August, 2021
Exposure 4 hours  (16 X 15 minutes)
Conditions Reasonably dark rural skies (Bortle 3 to 4)
Gain 100
Camera Zwo ASI2600MC-Pro
Optics Prime focus of a  SkyWatcher Esprit 120 f/7 APO refractor with a focal length of 840 mm
Filter Optolong L-eNhance
Location Marion Bridge, Nova Scotia
Processing This image was captured using Sequence Generator Pro. Split star processed similar to this image.