Star · K1III
HIP 31870
HIP 31870 is a giant star of spectral type K1III in the constellation Canis Major, 242.9 light-years from the Sun.
| Constellation | Canis Major |
|---|---|
| Distance | 242.9 light-years (74.5 pc) |
| Apparent magnitude | magnitude 5.70 |
| Absolute magnitude | magnitude 1.34 |
| Spectral type | K1III |
| Surface temperature | 4,440 K |
| Luminosity | 47.5 L☉ |
| Radius | 11.6 R☉ |
| Mass | 2.74 M☉ (estimated) |
| Right ascension (J2000) | 6h 39m 42.7s |
| Declination (J2000) | −30° 28′ 14″ |
| Space velocity (relative to the Sun) | 71.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.70). Visible from the whole Southern Hemisphere and north to latitude 60° N. South of latitude 60° S it never sets. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1783. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.3 million years.
The Sun seen from there
From a planet around HIP 31870, the Sun would look like a star of magnitude 9.19, in the direction where our sky has the constellation Lyra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 32649 13.6 light-years
- HIP 32894 15.0 light-years
- HIP 30514 15.2 light-years
- HIP 32576 16.1 light-years
- HIP 30378 17.8 light-years
- HIP 30223 17.9 light-years
- HIP 33197 18.5 light-years
- HIP 33411 19.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.