Collinder 350 is a fairly unimpressive looking open cluster in Ophiuchus. There isn’t a lot to say about it. It’s part of a catalog of open clusters published by Swedish astronomer Per Collinder in 1931. I chose it because it made a good filter target during the early part of the night when the moon was up.

The cluster is roughly 1,000 light years away and appears fairly sparse. Given its age of 600 million years, it seems likely that most of the stars that formed in it have moved out of the cluster.

The one interesting thing I found is link to an abstract of a paper from 2021 that makes the argument that Collinder 350 and open cluster IC 4665 have collided. Given that these cluster are mostly open space by volume that probably means the cluster have passed through each other and gravitationally affected each other but not that any stars have actually collided.

This is 8h of RGB data. For the technical details see astrobin.