Star · K5III
51 Aur
51 Aur is a giant star of spectral type K5III in the constellation Auriga, 467.9 light-years from the Sun.
| Other names | HIP 31771 |
|---|---|
| Constellation | Auriga |
| Distance | 467.9 light-years (143.5 pc) |
| Apparent magnitude | magnitude 5.70 |
| Absolute magnitude | magnitude −0.08 |
| Spectral type | K5III |
| Surface temperature | 4,010 K |
| Luminosity | 263 L☉ |
| Radius | 33.7 R☉ |
| Mass | 4.46 M☉ (estimated) |
| Right ascension (J2000) | 6h 38m 39.5s |
| Declination (J2000) | +39° 23′ 27″ |
| Space velocity (relative to the Sun) | 82.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.70). Visible from the whole Northern Hemisphere and south to latitude 51° S. North of latitude 51° N it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1558. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 8.3 million years.
The Sun seen from there
From a planet around 51 Aur, the Sun would look like a star of magnitude 10.61, in the direction where our sky has the constellation Corona Australis. 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.