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Hercules Cluster (M13, NGC6205)
Sometimes called the Great Hercules Cluster is considered the most spectacular globular cluster in the northern skies. One of the reasons M13 appears so large and bright is that is relatively nearby, about 25,000 light years away. its angular diameter is 23', or approximately 143 light years.
Curious note: In 1974, the Arecibo radio telescope sent a message towards M13 intended to communicate the existence of human intelligence to potential aliens inside the cluster. But, the message will not reach M13 for 25,000+ years and by the time it arrives, M13 will no longer be in the intended place for the message.
I captured this with my William Optics FLT91 with 6AIII 0.8x reducer, ZWO ASI2600MC Pro camera and Astronomik CLS-CCD 2" filter. The image was then cropped to zoom on the cluster.
More details: astrob.in/j46h1n/C/
Hercules Cluster (M13, NGC6205)
Sometimes called the Great Hercules Cluster is considered the most spectacular globular cluster in the northern skies. One of the reasons M13 appears so large and bright is that is relatively nearby, about 25,000 light years away. its angular diameter is 23', or approximately 143 light years.
Curious note: In 1974, the Arecibo radio telescope sent a message towards M13 intended to communicate the existence of human intelligence to potential aliens inside the cluster. But, the message will not reach M13 for 25,000+ years and by the time it arrives, M13 will no longer be in the intended place for the message.
I captured this with my William Optics FLT91 with 6AIII 0.8x reducer, ZWO ASI2600MC Pro camera and Astronomik CLS-CCD 2" filter. The image was then cropped to zoom on the cluster.
More details: astrob.in/j46h1n/C/