Star · B5V
τ⁸ Eri
τ⁸ Eri is a main-sequence star of spectral type B5V in the constellation Eridanus, 327.5 light-years from the Sun.
| Other names | HIP 18216 |
|---|---|
| Constellation | Eridanus |
| Distance | 327.5 light-years (100.4 pc) |
| Apparent magnitude | magnitude 4.64 |
| Absolute magnitude | magnitude −0.37 |
| Spectral type | B5V |
| Surface temperature | 12,220 K |
| Luminosity | 238 L☉ |
| Radius | 3.44 R☉ |
| Mass | 4.34 M☉ (estimated) |
| Right ascension (J2000) | 3h 53m 42.7s |
| Declination (J2000) | −24° 36′ 44″ |
| Space velocity (relative to the Sun) | 99.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.64). Visible from the whole Southern Hemisphere and north to latitude 65° N. South of latitude 65° 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 1698. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.8 million years.
The Sun seen from there
From a planet around τ⁸ Eri, the Sun would look like a star of magnitude 9.84, in the direction where our sky has the constellation Serpens. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.