Star
A yellow-white supergiant and the brightest star in Lepus, nearing the end of its life and likely to end as a supernova.
| Type | Star |
|---|---|
| Distance from Earth | 2,200 ly |
| Diameter | 179,656,000 km |
| Mass | 2.77 × 10³¹ kg |
| Temperature | 6,577°C |
| Apparent magnitude | 2.58 |
| Redshift | 0 |
| Hemisphere | Southern |
| Discovered | 150 |
Stars spend most of their lives fusing hydrogen into helium in their core, and it's the balance between that outward pressure and gravity pulling inward that fixes how big and how bright a star gets.
At 179,656,000 km across, Arneb is 129 times the diameter of the Sun.
Its mass is 14 times the mass of the Sun.
The light reaching us from Arneb tonight left it around 2,200 years ago.
Its surface sits at 6,850 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