Star · G7III
1 Gem
1 Gem is a giant star of spectral type G7III in the constellation Gemini, 155.1 light-years from the Sun.
| Other names | HIP 28734 |
|---|---|
| Constellation | Gemini |
| Distance | 155.1 light-years (47.6 pc) |
| Apparent magnitude | magnitude 4.16 |
| Absolute magnitude | magnitude 0.77 |
| Spectral type | G7III |
| Surface temperature | 5,180 K |
| Luminosity | 53.6 L☉ |
| Radius | 9.1 R☉ |
| Mass | 2.83 M☉ (estimated) |
| Right ascension (J2000) | 6h 04m 07.2s |
| Declination (J2000) | +23° 15′ 48″ |
| Space velocity (relative to the Sun) | 34.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.16). Visible from the whole Northern Hemisphere and south to latitude 67° S. North of latitude 67° 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 1871. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around 1 Gem, the Sun would look like a star of magnitude 8.22, 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 28736 4.91 light-years
- HIP 29074 11.5 light-years
- HIP 29221 16.9 light-years
- HIP 30880 18.5 light-years
- HIP 29312 20.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.