Star · M2III
7 Eri
7 Eri is a giant star of spectral type M2III in the constellation Eridanus, 1,257 light-years from the Sun.
| Other names | HIP 14040 |
|---|---|
| Constellation | Eridanus |
| Distance | 1,257 light-years (385.4 pc) |
| Apparent magnitude | magnitude 6.11 |
| Absolute magnitude | magnitude −1.82 |
| Spectral type | M2III |
| Surface temperature | 3,450 K |
| Luminosity | 2,860 L☉ |
| Radius | 150 R☉ |
| Mass | 8.83 M☉ (estimated) |
| Right ascension (J2000) | 3h 00m 50.9s |
| Declination (J2000) | −2° 52′ 43″ |
| Space velocity (relative to the Sun) | 85.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.11). Visible from the whole Southern Hemisphere and north to latitude 87° N. 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 769. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 22 million years.
The Sun seen from there
From a planet around 7 Eri, the Sun would look like a star of magnitude 12.76, in the direction where our sky has the constellation Virgo. 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.