Star · A3
47 Her
47 Her is a main-sequence star of spectral type A3 in the constellation Hercules, 191.5 light-years from the Sun.
| Other names | HIP 82402 |
|---|---|
| Constellation | Hercules |
| Distance | 191.5 light-years (58.7 pc) |
| Apparent magnitude | magnitude 5.48 |
| Absolute magnitude | magnitude 1.64 |
| Spectral type | A3 |
| Surface temperature | 8,950 K |
| Luminosity | 22.4 L☉ |
| Radius | 1.97 R☉ |
| Mass | 2.21 M☉ (estimated) |
| Right ascension (J2000) | 16h 50m 19.4s |
| Declination (J2000) | +7° 14′ 52″ |
| Space velocity (relative to the Sun) | 15.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.48). Visible from the whole Northern Hemisphere and south to latitude 83° S. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1834. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.4 million years.
The Sun seen from there
From a planet around 47 Her, the Sun would look like a star of magnitude 8.67, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 81215 14.2 light-years
- HIP 81387 14.8 light-years
- HIP 83757 17.1 light-years
- HIP 82186 17.4 light-years
- HIP 80981 17.9 light-years
- HD 155193 18.6 light-years
- HIP 81794 19.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.