Star · A2
2 UMa
2 UMa is a main-sequence star of spectral type A2 in the constellation Ursa Major, 149.7 light-years from the Sun.
| Other names | HIP 42080 |
|---|---|
| Constellation | Ursa Major |
| Distance | 149.7 light-years (45.9 pc) |
| Apparent magnitude | magnitude 5.47 |
| Absolute magnitude | magnitude 2.16 |
| Spectral type | A2 |
| Surface temperature | 8,110 K |
| Luminosity | 12.5 L☉ |
| Radius | 1.79 R☉ |
| Mass | 1.88 M☉ (estimated) |
| Right ascension (J2000) | 8h 34m 36.1s |
| Declination (J2000) | +65° 08′ 42″ |
| Space velocity (relative to the Sun) | 28.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.47). Visible from the whole Northern Hemisphere and south to latitude 25° S. North of latitude 25° N it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1876. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.7 million years.
The Sun seen from there
From a planet around 2 UMa, the Sun would look like a star of magnitude 8.14, in the direction where our sky has the constellation Pavo. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 40298 9.13 light-years
- WISEA J084329.01+694709.8 13.6 light-years
- HIP 43841 14.7 light-years
- HIP 45863 18.7 light-years
- HIP 39822 19.5 light-years
- 2MASS J09175418+6028065 19.6 light-years
- TOI-1243 19.9 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.