Star · A1V
τ⁷ Eri
τ⁷ Eri is a main-sequence star of spectral type A1V in the constellation Eridanus, 260.5 light-years from the Sun.
| Other names | HIP 17717 |
|---|---|
| Constellation | Eridanus |
| Distance | 260.5 light-years (79.9 pc) |
| Apparent magnitude | magnitude 5.24 |
| Absolute magnitude | magnitude 0.73 |
| Spectral type | A1V |
| Surface temperature | 9,280 K |
| Luminosity | 54 L☉ |
| Radius | 2.85 R☉ |
| Mass | 2.84 M☉ (estimated) |
| Right ascension (J2000) | 3h 47m 39.6s |
| Declination (J2000) | −23° 52′ 29″ |
| Space velocity (relative to the Sun) | 38.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.24). Visible from the whole Southern Hemisphere and north to latitude 66° N. South of latitude 66° 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 1766. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.6 million years.
The Sun seen from there
From a planet around τ⁷ Eri, the Sun would look like a star of magnitude 9.34, 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 17461 15.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.