Messier 4 (RGB)


Messier 4 is a globular cluster in Scorpius. Objects this far south never get very high in the sky at mid-northern latitudes and I wasn’t sure how this would turn out since I would be imaging through a lot of atmosphere. Overall, I was pretty happy with the results.

M4 has a fairly big apparent size. It’s nearly as large as the full moon. This is larger than most globular clusters appear in our sky. This is likely due to M4 being closer than most other globulars at “only” 7.2 thousand light years.

For all the technical details see astrobin.

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