Star · K2III
θ Oct
θ Oct is a giant star of spectral type K2III in the constellation Octans, 211.0 light-years from the Sun.
| Other names | HIP 122 |
|---|---|
| Constellation | Octans |
| Distance | 211.0 light-years (64.7 pc) |
| Apparent magnitude | magnitude 4.78 |
| Absolute magnitude | magnitude 0.73 |
| Spectral type | K2III |
| Surface temperature | 4,210 K |
| Luminosity | 102 L☉ |
| Radius | 19 R☉ |
| Mass | 3.4 M☉ (estimated) |
| Right ascension (J2000) | 0h 01m 35.7s |
| Declination (J2000) | −77° 03′ 56″ |
| Space velocity (relative to the Sun) | 61.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.78). 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 1815. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.7 million years.
The Sun seen from there
From a planet around θ Oct, the Sun would look like a star of magnitude 8.88, 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 1914 10.2 light-years
- λ Hyi 14.5 light-years
- HIP 113293 14.6 light-years
- HIP 359 15.7 light-years
- HIP 111486 17.9 light-years
- HIP 3010 18.2 light-years
- HIP 45 18.3 light-years
- HIP 117035 19.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.