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 ID M40 / Winnecke 4
Double star, Ursa Major
Mag. 8.4, Size 0.8′
Details 2018-09-14 through gaps in cloud
Telescope 200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Camera Canon 600D
Exposure(s) 5x20s darks, flats
Capture APT
Processing Nebulosity 4, Photoshop