Star · B9
4 Cyg
4 Cyg is a main-sequence star of spectral type B9 in the constellation Cygnus, 564.6 light-years from the Sun.
| Other names | HIP 95556 |
|---|---|
| Constellation | Cygnus |
| Distance | 564.6 light-years (173.1 pc) |
| Apparent magnitude | magnitude 5.17 |
| Absolute magnitude | magnitude −1.02 |
| Spectral type | B9 |
| Surface temperature | 11,920 K |
| Luminosity | 413 L☉ |
| Radius | 4.76 R☉ |
| Mass | 5.08 M☉ (estimated) |
| Right ascension (J2000) | 19h 26m 09.1s |
| Declination (J2000) | +36° 19′ 04″ |
| Space velocity (relative to the Sun) | 24.9 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.17). Visible from the whole Northern Hemisphere and south to latitude 54° S. North of latitude 54° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1461. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 10 million years.
The Sun seen from there
From a planet around 4 Cyg, the Sun would look like a star of magnitude 11.02, in the direction where our sky has the constellation Puppis. 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.