Star Cluster
The finest globular cluster visible from northern latitudes, and the target of the 1974 Arecibo radio message.
| Type | Star Cluster |
|---|---|
| Cluster type | Globular |
| Distance from Earth | 22,200 ly |
| Diameter | 1,372,000,000,000,000 km |
| Mass | 1.19 × 10^36 kg |
| Apparent magnitude | 5.8 |
| Redshift | 0 |
| Discovered | 1714 |
At 1,372,000,000,000,000 km across, Hercules Cluster (M13) is 107,675,404,175 times the diameter of Earth.
Its mass is 599,799 times the mass of the Sun.
The light reaching us from Hercules Cluster (M13) tonight left it around 22,200 years ago.
It has been on record since 1714.
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