Star · F7IV
σ² UMa
σ² UMa is a subgiant star of spectral type F7IV in the constellation Ursa Major, 66.9 light-years from the Sun.
| Other names | Gl 335A · HIP 45038 |
|---|---|
| Constellation | Ursa Major |
| Distance | 66.9 light-years (20.5 pc) |
| Apparent magnitude | magnitude 4.80 |
| Absolute magnitude | magnitude 3.24 |
| Spectral type | F7IV |
| Surface temperature | 6,440 K |
| Luminosity | 4.35 L☉ |
| Radius | 1.67 R☉ |
| Mass | 1.44 M☉ (estimated) |
| Right ascension (J2000) | 9h 10m 23.6s |
| Declination (J2000) | +67° 08′ 02″ |
| Space velocity (relative to the Sun) | 9.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.80). Visible from the whole Northern Hemisphere and south to latitude 23° S. North of latitude 23° 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 1959. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around σ² UMa, the Sun would look like a star of magnitude 6.39, in the direction where our sky has the constellation Pavo. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 335B 0.15 light-years
- GJ 3532 1.02 light-years
- WISEA J090258.99+670833.1 1.79 light-years
- 2MASS J08593854+6341355 6.52 light-years
- 16 UMa 6.70 light-years
- GJ 3560 7.75 light-years
- Gl 308.1 8.08 light-years
- GJ 3567 9.93 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.