Star · A2V
57 UMa
57 UMa is a main-sequence star of spectral type A2V in the constellation Ursa Major, 214.1 light-years from the Sun.
| Other names | HIP 56034 |
|---|---|
| Constellation | Ursa Major |
| Distance | 214.1 light-years (65.6 pc) |
| Apparent magnitude | magnitude 5.30 |
| Absolute magnitude | magnitude 1.21 |
| Spectral type | A2V |
| Surface temperature | 9,890 K |
| Luminosity | 37.9 L☉ |
| Radius | 2.09 R☉ |
| Mass | 2.57 M☉ (estimated) |
| Right ascension (J2000) | 11h 29m 04.1s |
| Declination (J2000) | +39° 20′ 13″ |
| Space velocity (relative to the Sun) | 17.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.30). 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 March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1812. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.8 million years.
The Sun seen from there
From a planet around 57 UMa, the Sun would look like a star of magnitude 8.92, in the direction where our sky has the constellation Phoenix. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 56826 8.84 light-years
- HIP 55913 9.39 light-years
- HIP 57091 12.3 light-years
- HIP 57090 12.6 light-years
- HIP 55281 13.0 light-years
- 55 UMa 13.6 light-years
- HIP 56671 19.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.