Star
An orange giant and the brightest star in Horologium, swollen to nearly ten times the diameter of the Sun.
| Type | Star |
|---|---|
| Distance from Earth | 118 ly |
| Diameter | 13,830,700 km |
| Mass | 2.80 × 10³⁰ kg |
| Temperature | 4,422°C |
| Apparent magnitude | 3.85 |
| Redshift | 0 |
| Hemisphere | Southern |
| Discovered | 1756 |
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 13,830,700 km across, Alpha Horologii is 9.9 times the diameter of the Sun.
Its mass is 1.4 times the mass of the Sun.
The light reaching us from Alpha Horologii tonight left it around 118 years ago.
Its surface sits at 4,695 K, cooler than the Sun at 5,772 K, which is what sets its colour.
It has been on record since 1756.
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