Star · O9I
19 Cep
19 Cep is a supergiant star of spectral type O9I in the constellation Cepheus, 3,191 light-years from the Sun.
| Other names | HIP 109017 |
|---|---|
| Constellation | Cepheus |
| Distance | 3,191 light-years (978.3 pc) |
| Apparent magnitude | magnitude 5.07 |
| Absolute magnitude | magnitude −4.88 |
| Spectral type | O9I |
| Surface temperature | 7,870 K |
| Luminosity | 8,000 L☉ |
| Radius | 48.2 R☉ |
| Mass | 11.8 M☉ (estimated) |
| Right ascension (J2000) | 22h 05m 08.8s |
| Declination (J2000) | +62° 16′ 47″ |
| Space velocity (relative to the Sun) | 20.5 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.07). Visible from the whole Northern Hemisphere and south to latitude 28° S. North of latitude 28° 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 1166 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 57 million years.
The Sun seen from there
From a planet around 19 Cep, the Sun would look like a star of magnitude 14.78, in the direction where our sky has the constellation Carina. 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.