M10 – A Globular Cluster

In the constellation of Ophiuchus there lies a few beautiful globular clusters. M10 is 14,300 light-years away with it’s bright core spanning 35 light-years across. Discovered and added to Messier’s catalogue on May 29, 1764 as number 10 in his list of objects that could be confused with comets, and was described as a nebula without stars. This cluster was thought to be a nebula until William Herschel was able to resolve some stars within the cluster which he described as a “beautiful cluster of extremely compressed stars”.

‘X’ Marks the spot of M10

My Observation: I’ll start off this section by saying that Globular clusters are one of my favorite objects. I look forward to summer because these seem to be all over the place in the night sky. This cluster is a bit on the dim side, and makes it hard to resolve many stars. Along the outside of the cluster, away from the bright core, I could make out a few stars, but they became almost like a nebula towards the center. I can see how Messier and a few others after him could have thought this was a nebula with their smaller telescopes, but it’s round shape, and stars easily allow you to see that this is indeed a globular cluster.

M10 – A Globular Cluster. 6-16-12

10 images at 1 minute a piece and 20 dark frames stacked in Deep Sky Stacker and post processing done in Photoshop. Omni XLT 150 prime focus Canon 350D.

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