Star · F9IV
ζ Her
ζ Her is a subgiant star of spectral type F9IV in the constellation Hercules, 34.9 light-years from the Sun.
| Other names | Gl 635A · HIP 81693 |
|---|---|
| Constellation | Hercules |
| Distance | 34.9 light-years (10.7 pc) |
| Apparent magnitude | magnitude 2.81 |
| Absolute magnitude | magnitude 2.66 |
| Spectral type | F9IV |
| Surface temperature | 5,780 K |
| Luminosity | 8.01 L☉ |
| Radius | 2.82 R☉ |
| Mass | 1.68 M☉ (estimated) |
| Right ascension (J2000) | 16h 41m 17.2s |
| Declination (J2000) | +31° 36′ 10″ |
| Space velocity (relative to the Sun) | 73.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 2.81). Visible from the whole Northern Hemisphere and south to latitude 58° S. North of latitude 58° 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 1991. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 620 thousand years.
The Sun seen from there
From a planet around ζ Her, the Sun would look like a star of magnitude 4.98, in the direction where our sky has the constellation Caelum. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.