Star · B3III
π² Cyg
π² Cyg is a giant star of spectral type B3III in the constellation Cygnus, 1,430 light-years from the Sun.
| Other names | HIP 107533 |
|---|---|
| Constellation | Cygnus |
| Distance | 1,430 light-years (438.6 pc) |
| Apparent magnitude | magnitude 4.23 |
| Absolute magnitude | magnitude −3.98 |
| Spectral type | B3III |
| Surface temperature | 11,920 K |
| Luminosity | 6,300 L☉ |
| Radius | 18.6 R☉ |
| Mass | 11.1 M☉ (estimated) |
| Right ascension (J2000) | 21h 46m 47.6s |
| Declination (J2000) | +49° 18′ 34″ |
| Space velocity (relative to the Sun) | 17.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.23). Visible from the whole Northern Hemisphere and south to latitude 41° S. North of latitude 41° 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 596. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 25 million years.
The Sun seen from there
From a planet around π² Cyg, the Sun would look like a star of magnitude 13.04, in the direction where our sky has the constellation Vela. 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.