Star · K1III
ψ UMa
ψ UMa is a giant star of spectral type K1III in the constellation Ursa Major, 140.4 light-years from the Sun.
| Other names | HIP 54539 |
|---|---|
| Constellation | Ursa Major |
| Distance | 140.4 light-years (43.1 pc) |
| Apparent magnitude | magnitude 3.00 |
| Absolute magnitude | magnitude −0.17 |
| Spectral type | K1III |
| Surface temperature | 4,420 K |
| Luminosity | 194 L☉ |
| Radius | 23.7 R☉ |
| Mass | 4.09 M☉ (estimated) |
| Right ascension (J2000) | 11h 09m 39.8s |
| Declination (J2000) | +44° 29′ 55″ |
| Space velocity (relative to the Sun) | 14.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.00). Visible from the whole Northern Hemisphere and south to latitude 46° S. North of latitude 46° 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 1886. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around ψ UMa, the Sun would look like a star of magnitude 8.00, in the direction where our sky has the constellation Grus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 54536 10.1 light-years
- SDSS J112706.62+470548.1 10.1 light-years
- HIP 54681 10.1 light-years
- HIP 54692 10.3 light-years
- HIP 55761 11.0 light-years
- TOI-1776 11.5 light-years
- HIP 56145 12.3 light-years
- 2MASSW J1123556+412228 13.2 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.