Star · K2III
42 UMa
42 UMa is a giant star of spectral type K2III in the constellation Ursa Major, 271.3 light-years from the Sun.
| Other names | HIP 53064 |
|---|---|
| Constellation | Ursa Major |
| Distance | 271.3 light-years (83.2 pc) |
| Apparent magnitude | magnitude 5.57 |
| Absolute magnitude | magnitude 0.97 |
| Spectral type | K2III |
| Surface temperature | 4,390 K |
| Luminosity | 69.6 L☉ |
| Radius | 14.4 R☉ |
| Mass | 3.05 M☉ (estimated) |
| Right ascension (J2000) | 10h 51m 23.7s |
| Declination (J2000) | +59° 19′ 12″ |
| Space velocity (relative to the Sun) | 31.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.57). Visible from the whole Northern Hemisphere and south to latitude 31° S. North of latitude 31° 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 1755. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.8 million years.
The Sun seen from there
From a planet around 42 UMa, the Sun would look like a star of magnitude 9.43, in the direction where our sky has the constellation Tucana. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 53127 7.61 light-years
- 2MASS J10592523+5659596 15.8 light-years
- SDSS J104934.84+602029.4 16.5 light-years
- HIP 55215 18.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.