Star · F5
τ¹ Eri
τ¹ Eri is a main-sequence star of spectral type F5 in the constellation Eridanus, 46.6 light-years from the Sun.
| Other names | Gl 111 · HIP 12843 |
|---|---|
| Constellation | Eridanus |
| Distance | 46.6 light-years (14.3 pc) |
| Apparent magnitude | magnitude 4.47 |
| Absolute magnitude | magnitude 3.70 |
| Spectral type | F5 |
| Surface temperature | 6,480 K |
| Luminosity | 2.85 L☉ |
| Radius | 1.34 R☉ |
| Mass | 1.3 M☉ (estimated) |
| Right ascension (J2000) | 2h 45m 06.2s |
| Declination (J2000) | −18° 34′ 21″ |
| Space velocity (relative to the Sun) | 36.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.47). Visible from the whole Southern Hemisphere and north to latitude 71° N. South of latitude 71° S it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1979. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 826 thousand years.
The Sun seen from there
From a planet around τ¹ Eri, the Sun would look like a star of magnitude 5.60, in the direction where our sky has the constellation Boötes. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- WISE J030449.03-270508.3 7.90 light-years
- Gl 95 8.71 light-years
- GJ 3162 9.09 light-years
- CWISEP J023842.60-133210.7 9.54 light-years
- Gl 142 9.67 light-years
- Dalim 9.76 light-years
- Gl 127B 9.77 light-years
- GJ 3198 10.0 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.