Star
The Demon Star of Perseus, which dims noticeably every 2.87 days as a companion passes in front of it, making it one of the first variable stars recognised.
| Type | Star |
|---|---|
| Distance from Earth | 94 ly |
| Diameter | 3,797,000 km |
| Mass | 6.31 × 10^30 kg |
| Temperature | 12,727°C |
| Apparent magnitude | 2.12 |
| Redshift | 0 |
| Discovered | 150 |
At 3,797,000 km across, Algol is 2.7 times the diameter of the Sun.
Its mass is 3.2 times the mass of the Sun.
The light reaching us from Algol tonight left it around 94 years ago.
Its surface sits at 13,000 K, hotter than the Sun at 5,772 K, which is what sets its colour.
It has been on record since the year 150.
Play today's Cosmodle