Star · G9III
HIP 31813
HIP 31813 is a giant star of spectral type G9III in the constellation Gemini, 373.5 light-years from the Sun.
| Constellation | Gemini |
|---|---|
| Distance | 373.5 light-years (114.5 pc) |
| Apparent magnitude | magnitude 6.09 |
| Absolute magnitude | magnitude 0.80 |
| Spectral type | G9III |
| Surface temperature | 4,680 K |
| Luminosity | 66.9 L☉ |
| Radius | 12.4 R☉ |
| Mass | 3.02 M☉ (estimated) |
| Right ascension (J2000) | 6h 39m 05.3s |
| Declination (J2000) | +22° 01′ 51″ |
| Space velocity (relative to the Sun) | 17.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.09). Visible from the whole Northern Hemisphere and south to latitude 68° S. North of latitude 68° N 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 1652. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6.6 million years.
The Sun seen from there
From a planet around HIP 31813, the Sun would look like a star of magnitude 10.12, in the direction where our sky has the constellation Sagittarius. 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.