Star · A5IV
4 Eri
4 Eri is a subgiant star of spectral type A5IV in the constellation Eridanus, 158.8 light-years from the Sun.
| Other names | HIP 13782 |
|---|---|
| Constellation | Eridanus |
| Distance | 158.8 light-years (48.7 pc) |
| Apparent magnitude | magnitude 5.44 |
| Absolute magnitude | magnitude 2.00 |
| Spectral type | A5IV |
| Surface temperature | 7,880 K |
| Luminosity | 14.1 L☉ |
| Radius | 2.02 R☉ |
| Mass | 1.94 M☉ (estimated) |
| Right ascension (J2000) | 2h 57m 23.8s |
| Declination (J2000) | −23° 51′ 44″ |
| Space velocity (relative to the Sun) | 33.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.44). 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 1867. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.8 million years.
The Sun seen from there
From a planet around 4 Eri, the Sun would look like a star of magnitude 8.27, in the direction where our sky has the constellation Boötes. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 12964 9.24 light-years
- HIP 13718 11.7 light-years
- HIP 12780 12.4 light-years
- HIP 12797 13.6 light-years
- WISEA J023749.81-260543.8 16.0 light-years
- HIP 12779 16.2 light-years
- HIP 15585 16.9 light-years
- HIP 11600 17.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.