Recently an image of M33 was posted on this site made by Michael van Doorn and myself. By searching for some papers on the internet I was able to find databases giving the coordinates of red and yellow hypergiants, post-red hypergiants (supernova progenitors), variable stars and globular clusters in M33. With pixinsight I overlaid these on the M33 image to show the different kinds of stars visible in the image. It’s astonishing how many separate stars can be distinguished with a 14 cm refractor nowadays.

Databases used:

Red/Yellow hypergiants: Link

Post-red hypergiants: Link

Variable stars: Link

Globular clusters: Link

 

 

 

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