Star · B9V
β¹ Tuc
β¹ Tuc is a main-sequence star of spectral type B9V in the constellation Tucana, 142.8 light-years from the Sun.
| Other names | HIP 2484 |
|---|---|
| Constellation | Tucana |
| Distance | 142.8 light-years (43.8 pc) |
| Apparent magnitude | magnitude 4.36 |
| Absolute magnitude | magnitude 1.15 |
| Spectral type | B9V |
| Surface temperature | 11,000 K |
| Luminosity | 47.8 L☉ |
| Radius | 1.9 R☉ |
| Mass | 2.74 M☉ (estimated) |
| Right ascension (J2000) | 0h 31m 32.7s |
| Declination (J2000) | −62° 57′ 30″ |
| Space velocity (relative to the Sun) | 23.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.36). Visible from the whole Southern Hemisphere and north to latitude 27° N. South of latitude 27° S it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1883. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around β¹ Tuc, the Sun would look like a star of magnitude 8.04, 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):
- HIP 1910 2.88 light-years
- HIP 2729 3.47 light-years
- HIP 1993 4.22 light-years
- HIP 1481 4.99 light-years
- β³ Tuc 7.64 light-years
- GJ 9015B 7.65 light-years
- DENIS J0006579-643654 8.08 light-years
- ρ Tuc 8.46 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.