Star Cluster
A bright naked-eye cluster in the tail of Scorpius, recorded by Ptolemy in AD 130 as a nebulous patch following the scorpion's sting.
| Type | Star Cluster |
|---|---|
| Cluster type | Open |
| Distance from Earth | 980 ly |
| Diameter | 473,035,000,000,000 km |
| Mass | 1.46 × 10^33 kg |
| Apparent magnitude | 3.3 |
| Redshift | 0 |
| Discovered | 130 |
At 473,035,000,000,000 km across, Ptolemy Cluster (M7) is 37,124,077,853 times the diameter of Earth.
Its mass is 735 times the mass of the Sun.
The light reaching us from Ptolemy Cluster (M7) tonight left it around 980 years ago.
It has been on record since the year 130.
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