Star · B9
φ Her
φ Her is a main-sequence star of spectral type B9 in the constellation Hercules, 240.3 light-years from the Sun.
| Other names | HIP 79101 |
|---|---|
| Constellation | Hercules |
| Distance | 240.3 light-years (73.7 pc) |
| Apparent magnitude | magnitude 4.23 |
| Absolute magnitude | magnitude −0.11 |
| Spectral type | B9 |
| Surface temperature | 10,720 K |
| Luminosity | 146 L☉ |
| Radius | 3.5 R☉ |
| Mass | 3.77 M☉ (estimated) |
| Right ascension (J2000) | 16h 08m 46.2s |
| Declination (J2000) | +44° 56′ 06″ |
| Space velocity (relative to the Sun) | 21.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.23). Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° N it never sets. It stands highest at midnight in May, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1786. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.3 million years.
The Sun seen from there
From a planet around φ Her, the Sun would look like a star of magnitude 9.17, in the direction where our sky has the constellation Horologium. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 79398 6.29 light-years
- HIP 79434 7.34 light-years
- SDSS J161312.06+472918.2 12.0 light-years
- HIP 80468 14.1 light-years
- HIP 80414 15.0 light-years
- HIP 77466 15.0 light-years
- HIP 79526 15.8 light-years
- HIP 80963 17.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.