Star · G8III
η Her
η Her is a giant star of spectral type G8III in the constellation Hercules, 111.5 light-years from the Sun.
| Other names | HIP 81833 |
|---|---|
| Constellation | Hercules |
| Distance | 111.5 light-years (34.2 pc) |
| Apparent magnitude | magnitude 3.48 |
| Absolute magnitude | magnitude 0.81 |
| Spectral type | G8III |
| Surface temperature | 4,950 K |
| Luminosity | 56.9 L☉ |
| Radius | 10.2 R☉ |
| Mass | 2.88 M☉ (estimated) |
| Right ascension (J2000) | 16h 42m 53.8s |
| Declination (J2000) | +38° 55′ 20″ |
| Space velocity (relative to the Sun) | 16.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.48). Visible from the whole Northern Hemisphere and south to latitude 51° S. North of latitude 51° 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 1915. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.0 million years.
The Sun seen from there
From a planet around η Her, the Sun would look like a star of magnitude 7.50, in the direction where our sky has the constellation Caelum. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 3979 4.63 light-years
- SDSS J163256.13+350507.2 8.43 light-years
- HIP 83141 8.98 light-years
- Gl 639 9.97 light-years
- SDSS J165450.79+374714.6 11.6 light-years
- HIP 82042 11.8 light-years
- GJ 3978 13.5 light-years
- τ CrB 14.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.