Star · B8III
40 Gem
40 Gem is a giant star of spectral type B8III in the constellation Gemini, 976.8 light-years from the Sun.
| Other names | HIP 33650 |
|---|---|
| Constellation | Gemini |
| Distance | 976.8 light-years (299.5 pc) |
| Apparent magnitude | magnitude 6.40 |
| Absolute magnitude | magnitude −0.98 |
| Spectral type | B8III |
| Surface temperature | 11,760 K |
| Luminosity | 387 L☉ |
| Radius | 4.74 R☉ |
| Mass | 4.99 M☉ (estimated) |
| Right ascension (J2000) | 6h 59m 27.9s |
| Declination (J2000) | +25° 54′ 51″ |
| Space velocity (relative to the Sun) | 36.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.40). Visible from the whole Northern Hemisphere and south to latitude 64° S. North of latitude 64° 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 1049. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 17 million years.
The Sun seen from there
From a planet around 40 Gem, the Sun would look like a star of magnitude 12.21, 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.