Star · A1V
η Tuc
η Tuc is a main-sequence star of spectral type A1V in the constellation Tucana, 159.7 light-years from the Sun.
| Other names | HIP 118121 |
|---|---|
| Constellation | Tucana |
| Distance | 159.7 light-years (49.0 pc) |
| Apparent magnitude | magnitude 5.00 |
| Absolute magnitude | magnitude 1.55 |
| Spectral type | A1V |
| Surface temperature | 9,430 K |
| Luminosity | 25.9 L☉ |
| Radius | 1.91 R☉ |
| Mass | 2.3 M☉ (estimated) |
| Right ascension (J2000) | 23h 57m 35.1s |
| Declination (J2000) | −64° 17′ 54″ |
| Space velocity (relative to the Sun) | 23.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.00). Visible from the whole Southern Hemisphere and north to latitude 26° N. South of latitude 26° 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 1866. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around η Tuc, the Sun would look like a star of magnitude 8.28, 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 1823 8.29 light-years
- 2MASS J00191296-6226005 8.52 light-years
- HIP 117374 10.1 light-years
- β² Tuc 13.2 light-years
- HIP 1399 13.8 light-years
- 2MASS J00182834-6703130 14.1 light-years
- β³ Tuc 14.4 light-years
- GJ 9015B 14.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.