Star · G5
HIP 30815
HIP 30815 is a giant star of spectral type G5 in the constellation Gemini, 238.7 light-years from the Sun.
| Constellation | Gemini |
|---|---|
| Distance | 238.7 light-years (73.2 pc) |
| Apparent magnitude | magnitude 6.24 |
| Absolute magnitude | magnitude 1.92 |
| Spectral type | G5 |
| Surface temperature | 5,010 K |
| Luminosity | 20 L☉ |
| Radius | 5.93 R☉ |
| Mass | 2.14 M☉ (estimated) |
| Right ascension (J2000) | 6h 28m 28.1s |
| Declination (J2000) | +16° 14′ 18″ |
| Space velocity (relative to the Sun) | 54.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.24). Visible from the whole Northern Hemisphere and south to latitude 74° S. North of latitude 74° 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 1787. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.2 million years.
The Sun seen from there
From a planet around HIP 30815, the Sun would look like a star of magnitude 9.15, 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 30665 14.1 light-years
- HIP 32308 19.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.