Sh2-240, also known as Simeis 147, is a very large supernova remnant. The supernova is estimated to have occured about 100,000 years ago, at a distance of 3,000 light-years. This emission nebula straddles the region between Auriga and Taurus. Due to its large size and being extremely faint, this target is challenging to photograph. Most images of this object are composed of narrowband acquisitions. My picture is a rendition of NB and RGB, resulting in more natural looking stars and making the dark nebulae more apparent.
Southern part of Sh2-240
Telescope: 16″ f3.75 Dream Scope
Camera: FLI ML16803
Mount: ASA DDM85
Exposure: 65x5min Ha + 65x5min OIII + 3x24x5min RGB (stars)
Date: December 2021 – January 2022
Location: Southern Alps, France
Bart Delsaert - Astrophotography 