Star · B2III
HIP 105091
HIP 105091 is a giant star of spectral type B2III in the constellation Cepheus, 2,515 light-years from the Sun.
| Constellation | Cepheus |
|---|---|
| Distance | 2,515 light-years (771.2 pc) |
| Apparent magnitude | magnitude 6.42 |
| Absolute magnitude | magnitude −3.02 |
| Spectral type | B2III |
| Surface temperature | 8,210 K |
| Luminosity | 1,480 L☉ |
| Radius | 19 R☉ |
| Mass | 7.32 M☉ (estimated) |
| Right ascension (J2000) | 21h 17m 18.8s |
| Declination (J2000) | +58° 36′ 41″ |
| Space velocity (relative to the Sun) | 24.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.42). Visible from the whole Northern Hemisphere and south to latitude 31° S. North of latitude 31° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around 490 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 45 million years.
The Sun seen from there
From a planet around HIP 105091, the Sun would look like a star of magnitude 14.27, in the direction where our sky has the constellation Carina. 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.