Star · A1V
78 Her
78 Her is a main-sequence star of spectral type A1V in the constellation Hercules, 272.0 light-years from the Sun.
| Other names | HIP 85790 |
|---|---|
| Constellation | Hercules |
| Distance | 272.0 light-years (83.4 pc) |
| Apparent magnitude | magnitude 5.66 |
| Absolute magnitude | magnitude 1.05 |
| Spectral type | A1V |
| Surface temperature | 10,140 K |
| Luminosity | 45.6 L☉ |
| Radius | 2.19 R☉ |
| Mass | 2.71 M☉ (estimated) |
| Right ascension (J2000) | 17h 31m 49.6s |
| Declination (J2000) | +28° 24′ 27″ |
| Space velocity (relative to the Sun) | 23.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.66). Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° N it never sets. 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 1754. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.8 million years.
The Sun seen from there
From a planet around 78 Her, the Sun would look like a star of magnitude 9.44, in the direction where our sky has the constellation Columba. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 85532 14.2 light-years
- HIP 84872 14.9 light-years
- HIP 85840 16.3 light-years
- HIP 85781 17.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.