Star · F3III
31 Cep
31 Cep is a giant star of spectral type F3III in the constellation Cepheus, 188.1 light-years from the Sun.
| Other names | HIP 111532 |
|---|---|
| Constellation | Cepheus |
| Distance | 188.1 light-years (57.7 pc) |
| Apparent magnitude | magnitude 5.08 |
| Absolute magnitude | magnitude 1.28 |
| Spectral type | F3III |
| Surface temperature | 6,910 K |
| Luminosity | 26.2 L☉ |
| Radius | 3.58 R☉ |
| Mass | 2.31 M☉ (estimated) |
| Right ascension (J2000) | 22h 35m 46.1s |
| Declination (J2000) | +73° 38′ 36″ |
| Space velocity (relative to the Sun) | 47.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.08). Visible from the whole Northern Hemisphere and south to latitude 16° S. North of latitude 16° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1838. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.3 million years.
The Sun seen from there
From a planet around 31 Cep, the Sun would look like a star of magnitude 8.63, in the direction where our sky has the constellation Carina. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 109384 11.2 light-years
- HIP 113517 12.0 light-years
- HIP 115894 14.0 light-years
- 11 Cep 17.3 light-years
- HIP 118117 18.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.