Star · F5I
HIP 81847
HIP 81847 is a supergiant star of spectral type F5I in the constellation Ara, 3,128 light-years from the Sun.
| Constellation | Ara |
|---|---|
| Distance | 3,128 light-years (959.1 pc) |
| Apparent magnitude | magnitude 6.22 |
| Absolute magnitude | magnitude −3.69 |
| Spectral type | F5I |
| Surface temperature | 5,220 K |
| Luminosity | 3,220 L☉ |
| Radius | 69.5 R☉ |
| Mass | 9.13 M☉ (estimated) |
| Right ascension (J2000) | 16h 43m 03.6s |
| Declination (J2000) | −46° 04′ 13″ |
| Space velocity (relative to the Sun) | 25.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.22). Visible from the whole Southern Hemisphere and north to latitude 44° N. South of latitude 44° S 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 1103 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 55 million years.
The Sun seen from there
From a planet around HIP 81847, the Sun would look like a star of magnitude 14.74, in the direction where our sky has the constellation Perseus. 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.