Star · A
τ⁹ Eri
τ⁹ Eri is a main-sequence star of spectral type A in the constellation Eridanus, 327.0 light-years from the Sun.
| Other names | HIP 18673 |
|---|---|
| Constellation | Eridanus |
| Distance | 327.0 light-years (100.3 pc) |
| Apparent magnitude | magnitude 4.62 |
| Absolute magnitude | magnitude −0.39 |
| Spectral type | A |
| Surface temperature | 11,940 K |
| Luminosity | 230 L☉ |
| Radius | 3.55 R☉ |
| Mass | 4.3 M☉ (estimated) |
| Right ascension (J2000) | 3h 59m 55.5s |
| Declination (J2000) | −24° 00′ 58″ |
| Space velocity (relative to the Sun) | 25.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.62). 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 1699. 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 τ⁹ 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.