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M25 Photometry


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About this observation
Nick White
Time of observation
01/06/2020 - 16:19
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Long story short, a freebee on a small robotic telescope offered up an unplanned opportunity to do some CCD photometry of the open cluster M25 (my first ever attempt). Here's a plot of V versus B-V, raw data, showing the main sequence and the variable U Sgr which has moved off the main sequence within the cluster.  It all looks plausible enough but keep in mind I'm a visual observer rather than a CCD bod...


Andy Wilson's picture

That's a great bit of astrophysics Nick!

Thanks for sharing,


nickoftime's picture

Thank you, Andy. I've made a similar plot for the globular M22 but which looks quite different, showing the giant branch sloping diagonally in the other sense like this...  /    

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