Star · K5
HIP 20231
HIP 20231 is a supergiant star of spectral type K5 in the constellation Perseus, 584.8 light-years from the Sun.
| Constellation | Perseus |
|---|---|
| Distance | 584.8 light-years (179.3 pc) |
| Apparent magnitude | magnitude 6.16 |
| Absolute magnitude | magnitude −0.11 |
| Spectral type | K5 |
| Surface temperature | 3,540 K |
| Luminosity | 505 L☉ |
| Radius | 59.6 R☉ |
| Mass | 5.38 M☉ (estimated) |
| Right ascension (J2000) | 4h 20m 09.9s |
| Declination (J2000) | +31° 57′ 11″ |
| Space velocity (relative to the Sun) | 21.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.16). Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° N it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1441. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 10 million years.
The Sun seen from there
From a planet around HIP 20231, the Sun would look like a star of magnitude 11.10, in the direction where our sky has the constellation Scorpius. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.