Star · A
15 UMa
15 UMa is a main-sequence star of spectral type A in the constellation Ursa Major, 93.4 light-years from the Sun.
| Other names | GJ 3534 · HIP 44901 |
|---|---|
| Constellation | Ursa Major |
| Distance | 93.4 light-years (28.6 pc) |
| Apparent magnitude | magnitude 4.46 |
| Absolute magnitude | magnitude 2.18 |
| Spectral type | A |
| Surface temperature | 7,540 K |
| Luminosity | 11.7 L☉ |
| Radius | 2.01 R☉ |
| Mass | 1.85 M☉ (estimated) |
| Right ascension (J2000) | 9h 08m 52.3s |
| Declination (J2000) | +51° 36′ 17″ |
| Space velocity (relative to the Sun) | 19.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.46). Visible from the whole Northern Hemisphere and south to latitude 38° S. North of latitude 38° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1933. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.7 million years.
The Sun seen from there
From a planet around 15 UMa, the Sun would look like a star of magnitude 7.11, in the direction where our sky has the constellation Indus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 45836 3.60 light-years
- HIP 45859 3.61 light-years
- HIP 44907 6.24 light-years
- GJ 3515 9.16 light-years
- GJ 3556 9.79 light-years
- HIP 46199 10.1 light-years
- GJ 3569 10.9 light-years
- SDSS J084135.31+455442.0 12.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.