Star · M4III
HIP 82172
HIP 82172 is a giant star of spectral type M4III in the constellation Hercules, 771.5 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 771.5 light-years (236.5 pc) |
| Apparent magnitude | magnitude 5.86 |
| Absolute magnitude | magnitude −1.01 |
| Spectral type | M4III |
| Surface temperature | 3,790 K |
| Luminosity | 804 L☉ |
| Radius | 65.8 R☉ |
| Mass | 6.14 M☉ (estimated) |
| Right ascension (J2000) | 16h 47m 19.7s |
| Declination (J2000) | +42° 14′ 20″ |
| Space velocity (relative to the Sun) | 31.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.86). Visible from the whole Northern Hemisphere and south to latitude 48° S. North of latitude 48° 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 1255. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 14 million years.
The Sun seen from there
From a planet around HIP 82172, the Sun would look like a star of magnitude 11.70, in the direction where our sky has the constellation Caelum. 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.