Star · F4III
α Oct
α Oct is a giant star of spectral type F4III in the constellation Octans, 147.1 light-years from the Sun.
| Other names | HIP 104043 |
|---|---|
| Constellation | Octans |
| Distance | 147.1 light-years (45.1 pc) |
| Apparent magnitude | magnitude 5.13 |
| Absolute magnitude | magnitude 1.86 |
| Spectral type | F4III |
| Surface temperature | 6,430 K |
| Luminosity | 15.5 L☉ |
| Radius | 3.17 R☉ |
| Mass | 1.98 M☉ (estimated) |
| Right ascension (J2000) | 21h 04m 43.0s |
| Declination (J2000) | −77° 01′ 26″ |
| Space velocity (relative to the Sun) | 91.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.13). Visible from the whole Southern Hemisphere and north to latitude 13° N. South of latitude 13° S it never sets.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1879. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.6 million years.
The Sun seen from there
From a planet around α Oct, the Sun would look like a star of magnitude 8.10, in the direction where our sky has the constellation Camelopardalis. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 107665 7.86 light-years
- HIP 101631 11.9 light-years
- HIP 108041 14.7 light-years
- HIP 96425 15.1 light-years
- β Oct 16.5 light-years
- WISEA J204902.80-745613.5 17.5 light-years
- HD 196067 17.6 light-years
- HIP 102128 17.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.