Star · A3IV
30 Cep
30 Cep is a subgiant star of spectral type A3IV in the constellation Cepheus, 306.3 light-years from the Sun.
| Other names | HIP 111797 |
|---|---|
| Constellation | Cepheus |
| Distance | 306.3 light-years (93.9 pc) |
| Apparent magnitude | magnitude 5.19 |
| Absolute magnitude | magnitude 0.33 |
| Spectral type | A3IV |
| Surface temperature | 9,200 K |
| Luminosity | 77.3 L☉ |
| Radius | 3.47 R☉ |
| Mass | 3.15 M☉ (estimated) |
| Right ascension (J2000) | 22h 38m 39.0s |
| Declination (J2000) | +63° 35′ 04″ |
| Space velocity (relative to the Sun) | 13.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.19). Visible from the whole Northern Hemisphere and south to latitude 26° S. North of latitude 26° 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 1720. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.4 million years.
The Sun seen from there
From a planet around 30 Cep, the Sun would look like a star of magnitude 9.69, in the direction where our sky has the constellation Carina. It would be invisible to the naked eye.
Neighbours
The catalogue has no other star within 20 light-years.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.