Star · K0III
η Ser
η Ser is a giant star of spectral type K0III in the constellation Serpens, 62.2 light-years from the Sun.
| Other names | Gl 711 · HIP 89962 |
|---|---|
| Constellation | Serpens |
| Distance | 62.2 light-years (19.1 pc) |
| Apparent magnitude | magnitude 3.23 |
| Absolute magnitude | magnitude 1.83 |
| Spectral type | K0III |
| Surface temperature | 4,890 K |
| Luminosity | 23 L☉ |
| Radius | 6.69 R☉ |
| Mass | 2.23 M☉ (estimated) |
| Right ascension (J2000) | 18h 21m 18.6s |
| Declination (J2000) | −2° 53′ 56″ |
| Space velocity (relative to the Sun) | 81.0 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 3.23). Visible from the whole Southern Hemisphere and north to latitude 87° N. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1964. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.1 million years.
The Sun seen from there
From a planet around η Ser, the Sun would look like a star of magnitude 6.23, in the direction where our sky has the constellation Monoceros. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 710 1.12 light-years
- Gl 715 2.72 light-years
- WISE J180952.53-044812.5 5.56 light-years
- GJ 4056 7.35 light-years
- Gaia J183610.72+031524.6 8.10 light-years
- GJ 1226 9.76 light-years
- Gl 723 10.2 light-years
- GJ 2135 11.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.