Star · F0III
Polaris Australis
Polaris Australis is a giant star of spectral type F0III in the constellation Octans, 293.8 light-years from the Sun.
| Other names | σ Oct · HIP 104382 |
|---|---|
| Constellation | Octans |
| Distance | 293.8 light-years (90.1 pc) |
| Apparent magnitude | magnitude 5.45 |
| Absolute magnitude | magnitude 0.68 |
| Spectral type | F0III |
| Surface temperature | 7,570 K |
| Luminosity | 46.7 L☉ |
| Radius | 3.97 R☉ |
| Mass | 2.72 M☉ (estimated) |
| Right ascension (J2000) | 21h 08m 47.0s |
| Declination (J2000) | −88° 57′ 23″ |
| Space velocity (relative to the Sun) | 14.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.45). Visible from the whole Southern Hemisphere and north to latitude 1° N. South of latitude 1° S it never sets.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1732. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.2 million years.
The Sun seen from there
From a planet around Polaris Australis, the Sun would look like a star of magnitude 9.60, in the direction where our sky has the constellation Ursa Minor. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 1649 9.47 light-years
- HIP 92332 15.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.