Crescent Nebula (NGC 6888) in Cygnus
NGC 6888 (Caldwell 27) is one of the more intriguing objects in our galaxy as it is located around HD 192163, a 7.5‑mag Wolf-Rayet star. It has long been believed that this extremly luminous sun is heating a part of it outer atmosphere which has a diameter of roughly 20 lightyears. The Crescent Nebula spans an area of about 18x13 arc minutes in the constallation of Cygnus, roughly 4700 lightyears away.
[description from O’Meara]
Details
Telescope:
RCOS 14.5″ f/8
Mount:
ASA DDM85
Camera:
Apogee U16M
Filters:
Astrodon Gen2
Exposure:
HaOIIILRGB 360:570:340:280:280:240 min.
Location:
ROSA Remote Observatories Southern Alps
Author:
© Martin Rusterholz, Astrophotographer

Hello, my name is Martin Rusterholz. I’m a Swiss amateur astrophotographer living near Zurich, the biggest town in Switzerland. My interest in astronomy started when I was 16. At that time, I built my first Newtonian telescope and mount. I studied physics at the Swiss Federal Institute of Technology (ETH) which was the only study including at least some aspects of astronomy and astrophysics.
“Looking at the nights sky is an experience touching everybody deeply inside, something common to all human beings independent to the language spoken by the individuals”.
Deep-sky astrophotography is my passion.