Star · A1I
42 Cyg
42 Cyg is a supergiant star of spectral type A1I in the constellation Cygnus, 3,806 light-years from the Sun.
| Other names | HIP 101067 |
|---|---|
| Constellation | Cygnus |
| Distance | 3,806 light-years (1,167 pc) |
| Apparent magnitude | magnitude 5.90 |
| Absolute magnitude | magnitude −4.44 |
| Spectral type | A1I |
| Surface temperature | 6,840 K |
| Luminosity | 5,050 L☉ |
| Radius | 50.5 R☉ |
| Mass | 10.4 M☉ (estimated) |
| Right ascension (J2000) | 20h 29m 20.4s |
| Declination (J2000) | +36° 27′ 17″ |
| Space velocity (relative to the Sun) | 21.1 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.90). 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 1781 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 68 million years.
The Sun seen from there
From a planet around 42 Cyg, the Sun would look like a star of magnitude 15.17, in the direction where our sky has the constellation Pyxis. 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.