Star · K1III
30 Gem
30 Gem is a giant star of spectral type K1III in the constellation Gemini, 314.2 light-years from the Sun.
| Other names | HIP 32249 |
|---|---|
| Constellation | Gemini |
| Distance | 314.2 light-years (96.3 pc) |
| Apparent magnitude | magnitude 4.49 |
| Absolute magnitude | magnitude −0.43 |
| Spectral type | K1III |
| Surface temperature | 4,370 K |
| Luminosity | 255 L☉ |
| Radius | 27.8 R☉ |
| Mass | 4.42 M☉ (estimated) |
| Right ascension (J2000) | 6h 43m 59.3s |
| Declination (J2000) | +13° 13′ 41″ |
| Space velocity (relative to the Sun) | 26.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.49). Visible from the whole Northern Hemisphere and south to latitude 77° S. North of latitude 77° 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 1712. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.6 million years.
The Sun seen from there
From a planet around 30 Gem, the Sun would look like a star of magnitude 9.75, in the direction where our sky has the constellation Scutum. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 31802 17.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.