Author Archives: Roger Samworth

M46 and M47

There are a couple of very interesting open clusters in Puppis, not far from Sirius, for different reasons. I found that I had not imaged M47 before, probably because I thought it was a relatively uninteresting plain cluster. Not so! Here is an image of it from the window-sill from yesterday:

I thought at first that the star colours were chromatic aberration, but, in fact they are there in images on the www.. (See Very colourful!

M46 includes a planetary nebula (NGC2438) in the same field that is very unusual. I didn’t manage to see this one yesterday, but here is an image from 3 years ago,