M13 – Hercules cluster

M13 – The Hercules star cluster

Star clusters are still one of the biggest mysteries in astronomy and science! Where did they come from? Why do they almost only hold old stars at the end of their lifetime? Why are they all gathering there?
So many (yet) unanswered questions. What we know so far is, that there are quite a few of those star clusters circling the milky way as a satellite of our galaxy and that they seem to be made up of mostly old stars which are getting close to their end of life. No new stars are born in those clusters.

Even though The Hercules cluster is probably the most famous globular cluster in existence, there are also a few others out there that are observable by binoculars or even with the bare eye at a dark location.
As the name suggests, this star cluster is located within the constellation of Hercules.
The cluster is located around 22’000 light years from earth and has a radius of 84 light years.
Its mass is estimated to ~600’000 solar masses.

Taken with:
Canon 7D Mark II, GSO RC8″, Celestron AVX and the ASI224MC as off-axis guider
only 4x300s (total 20min) stacked and post-processed in PixInsight and LightRoom

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