Star · G8 V
HIP 81991
HIP 81991 is a giant star of spectral type G8 V in the constellation Hercules, 143.2 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Hercules |
|---|---|
| Distance | 143.2 light-years (43.9 pc) |
| Apparent magnitude | magnitude 6.55 |
| Absolute magnitude | magnitude 3.34 |
| Spectral type | G8 V |
| Surface temperature | 5,100 K |
| Luminosity | 4.85 L☉ |
| Radius | 2.82 R☉ |
| Mass | 1.09 M☉ |
| Metallicity [Fe/H] | -0.27 |
| Right ascension (J2000) | 16h 44m 60.0s |
| Declination (J2000) | +6° 05′ 17″ |
| Space velocity (relative to the Sun) | 69.9 km/s |
In the sky
Too faint for the naked eye (magnitude 6.55); binoculars will find it. Visible from the whole Northern Hemisphere and south to latitude 84° S. 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 1883. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around HIP 81991, the Sun would look like a star of magnitude 8.04, in the direction where our sky has the constellation Eridanus. It would be invisible to the naked eye.
Planets
- HIP 81991 b 5,860-day orbit · 12.5 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 81988 0.16 light-years
- HIP 80837 10.9 light-years
- GJ 9566 11.4 light-years
- HIP 83747 14.0 light-years
- HIP 83744 14.0 light-years
- HIP 83204 15.8 light-years
- HIP 82733 16.8 light-years
- HIP 84082 17.0 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.