Star · B9I
HIP 28500
HIP 28500 is a supergiant star of spectral type B9I in the constellation Gemini, 5,659 light-years from the Sun.
| Constellation | Gemini |
|---|---|
| Distance | 5,659 light-years (1,735 pc) |
| Apparent magnitude | magnitude 6.04 |
| Absolute magnitude | magnitude −5.16 |
| Spectral type | B9I |
| Surface temperature | 8,030 K |
| Luminosity | 10,500 L☉ |
| Radius | 52.9 R☉ |
| Mass | 12.8 M☉ (estimated) |
| Right ascension (J2000) | 6h 01m 00.5s |
| Declination (J2000) | +27° 34′ 21″ |
| Space velocity (relative to the Sun) | 20.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.04). Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° 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 5,659 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 100 million years.
The Sun seen from there
From a planet around HIP 28500, the Sun would look like a star of magnitude 16.03, 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.