Messier 40, also known as Winnecke 4. Basically it’s a double star, and an optical double at that!

It was discovered by Messier while he was looking for a nebula reported in the area by Johannes Hevelius. He couldn’t find it so he catalogued this double star instead. Most have been a slow night or something…

And why did I bother imaging it? Well it was in the only patch of clear sky there was and I only had a few minutes before it clouded over. Still, it’s another Messier object to add to my list 🙂

Object IDM40 / Winnecke 4
Double star, Ursa Major
Mag. 8.4, Size 0.8′
Details2018-09-14 through gaps in cloud
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
CameraCanon 600D
Exposure(s)5x20s darks, flats
ProcessingNebulosity 4, Photoshop