Star · B9V
τ⁵ Eri
τ⁵ Eri is a main-sequence star of spectral type B9V in the constellation Eridanus, 320.0 light-years from the Sun.
| Other names | HIP 16611 |
|---|---|
| Constellation | Eridanus |
| Distance | 320.0 light-years (98.1 pc) |
| Apparent magnitude | magnitude 4.26 |
| Absolute magnitude | magnitude −0.70 |
| Spectral type | B9V |
| Surface temperature | 11,670 K |
| Luminosity | 294 L☉ |
| Radius | 4.19 R☉ |
| Mass | 4.61 M☉ (estimated) |
| Right ascension (J2000) | 3h 33m 47.3s |
| Declination (J2000) | −21° 37′ 58″ |
| Space velocity (relative to the Sun) | 28.2 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.26). Visible from the whole Southern Hemisphere and north to latitude 68° N. South of latitude 68° S it never sets. It stands highest at midnight in November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1706. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.7 million years.
The Sun seen from there
From a planet around τ⁵ Eri, the Sun would look like a star of magnitude 9.79, in the direction where our sky has the constellation Serpens. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 16261 11.7 light-years
- HIP 15660 17.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.