Star · A3III
θ Gem
θ Gem is a giant star of spectral type A3III in the constellation Gemini, 193.3 light-years from the Sun.
| Other names | HIP 33018 |
|---|---|
| Constellation | Gemini |
| Distance | 193.3 light-years (59.3 pc) |
| Apparent magnitude | magnitude 3.60 |
| Absolute magnitude | magnitude −0.26 |
| Spectral type | A3III |
| Surface temperature | 9,010 K |
| Luminosity | 130 L☉ |
| Radius | 4.68 R☉ |
| Mass | 3.65 M☉ (estimated) |
| Right ascension (J2000) | 6h 52m 47.3s |
| Declination (J2000) | +33° 57′ 41″ |
| Space velocity (relative to the Sun) | 35.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.60). Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1833. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.4 million years.
The Sun seen from there
From a planet around θ Gem, the Sun would look like a star of magnitude 8.69, in the direction where our sky has the constellation Sagittarius. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 32364 8.17 light-years
- HIP 32415 9.03 light-years
- HIP 32299 12.4 light-years
- HIP 34311 15.1 light-years
- 60 Aur 15.6 light-years
- HIP 32125 18.5 light-years
- HIP 32350 19.0 light-years
- HIP 31183 19.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.