Star · K2III
109 Her
109 Her is a giant star of spectral type K2III in the constellation Hercules, 121.0 light-years from the Sun.
| Other names | HIP 90139 |
|---|---|
| Constellation | Hercules |
| Distance | 121.0 light-years (37.1 pc) |
| Apparent magnitude | magnitude 3.85 |
| Absolute magnitude | magnitude 1.00 |
| Spectral type | K2III |
| Surface temperature | 4,370 K |
| Luminosity | 68.3 L☉ |
| Radius | 14.4 R☉ |
| Mass | 3.04 M☉ (estimated) |
| Right ascension (J2000) | 18h 23m 41.9s |
| Declination (J2000) | +21° 46′ 11″ |
| Space velocity (relative to the Sun) | 79.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.85). Visible from the whole Northern Hemisphere and south to latitude 68° S. North of latitude 68° 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 1905. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.1 million years.
The Sun seen from there
From a planet around 109 Her, the Sun would look like a star of magnitude 7.68, in the direction where our sky has the constellation Canis Major. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 90729 7.67 light-years
- HIP 88913 9.13 light-years
- PSO J276.8234+22.4380 9.78 light-years
- HIP 91043 9.95 light-years
- WISEA J184202.04+210428.7 14.2 light-years
- HIP 90249 14.3 light-years
- HIP 91159 14.9 light-years
- HIP 91381 16.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.