Star · M3III
104 Her
104 Her is a giant star of spectral type M3III in the constellation Hercules, 521.7 light-years from the Sun.
| Other names | HIP 89172 |
|---|---|
| Constellation | Hercules |
| Distance | 521.7 light-years (160.0 pc) |
| Apparent magnitude | magnitude 4.96 |
| Absolute magnitude | magnitude −1.06 |
| Spectral type | M3III |
| Surface temperature | 3,590 K |
| Luminosity | 1,120 L☉ |
| Radius | 86.6 R☉ |
| Mass | 6.76 M☉ (estimated) |
| Right ascension (J2000) | 18h 11m 54.2s |
| Declination (J2000) | +31° 24′ 19″ |
| Space velocity (relative to the Sun) | 21.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.96). Visible from the whole Northern Hemisphere and south to latitude 59° S. North of latitude 59° 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 1504. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 9.3 million years.
The Sun seen from there
From a planet around 104 Her, the Sun would look like a star of magnitude 10.85, in the direction where our sky has the constellation Canis Major. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.