Star · K2III
HIP 31121
HIP 31121 is a giant star of spectral type K2III in the constellation Monoceros, 740.8 light-years from the Sun.
| Constellation | Monoceros |
|---|---|
| Distance | 740.8 light-years (227.1 pc) |
| Apparent magnitude | magnitude 5.43 |
| Absolute magnitude | magnitude −1.35 |
| Spectral type | K2III |
| Surface temperature | 4,000 K |
| Luminosity | 855 L☉ |
| Radius | 61 R☉ |
| Mass | 6.25 M☉ (estimated) |
| Right ascension (J2000) | 6h 31m 50.1s |
| Declination (J2000) | −8° 09′ 30″ |
| Space velocity (relative to the Sun) | 25.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.43). Visible from the whole Southern Hemisphere and north to latitude 82° N. 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 1285. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 13 million years.
The Sun seen from there
From a planet around HIP 31121, the Sun would look like a star of magnitude 11.61, in the direction where our sky has the constellation Ophiuchus. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.