Crescent Nebula and Cygnus Environs - July 2022
Televue NP127is - AIS6200MM
A-P 1100 GTO AE, Antlia Pro 3nm NB filters
H,S,O: (3 x 45 x 330s exposures, Bin 2, Gain 200)
R,G,B: (3 x 50 x 90s exposures, Bin 2, Gain 100)
Total Integration Time = 16 hours
This image is more of the massive nebulosity complex within Cygnus. I like this area of the Milky Way because there is so much going on. The background nebulosity is complex, with dark nebulosity appearing as "ink spills" over star blown shock fronts of hydrogen.
In the foreground is the NGC6888, the Crescent Nebula. It is formed by the Wolf Rayet Star at its centre (WR-136) light up and pushing around material ejected from the star earlier in its life. Wolf Rayet stars are very interesting, have lost or spent most of their hydrogen, and now powered mainly by Helium fusion. The nebula is 5000 l-y away, and about 25 l-y across.
Also visible at centre bottom of the frame, is the "Soup Bubble" Nebula, a very interesting object recently discovered (2007/08) by an amateur astronomer, Dave Jurasevich. This object only appears when using a Ha filter.
I tried to strike a decent balance between the Crescent Nebula and the background nebulosity in this composition. Narrowband data was used to the show the nebulosity, while RGB filters were used only for the stars and star colours.
This was also an early foray (v2, at least) into post adjustments using Lightroom.