Star · K3III
α Tuc
α Tuc is a giant star of spectral type K3III in the constellation Tucana, 183.9 light-years from the Sun.
| Other names | HIP 110130 |
|---|---|
| Constellation | Tucana |
| Distance | 183.9 light-years (56.4 pc) |
| Apparent magnitude | magnitude 2.87 |
| Absolute magnitude | magnitude −0.89 |
| Spectral type | K3III |
| Surface temperature | 3,970 K |
| Luminosity | 575 L☉ |
| Radius | 50.8 R☉ |
| Mass | 5.58 M☉ (estimated) |
| Right ascension (J2000) | 22h 18m 30.1s |
| Declination (J2000) | −60° 15′ 34″ |
| Space velocity (relative to the Sun) | 47.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 2.87). Visible from the whole Southern Hemisphere and north to latitude 30° N. South of latitude 30° S it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1842. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.3 million years.
The Sun seen from there
From a planet around α Tuc, the Sun would look like a star of magnitude 8.59, in the direction where our sky has the constellation Ursa Major. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- κ¹ Ind 18.3 light-years
- HIP 109488 18.3 light-years
- HIP 112201 18.8 light-years
- HIP 112002 19.0 light-years
- δ Ind 19.7 light-years
- TOI-122 19.8 light-years
- HIP 109228 19.8 light-years
- 2MASS J21481326-6323265 20.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.