Star · B3V
70 Cyg
70 Cyg is a main-sequence star of spectral type B3V in the constellation Cygnus, 1,325 light-years from the Sun.
| Other names | HIP 105942 |
|---|---|
| Constellation | Cygnus |
| Distance | 1,325 light-years (406.3 pc) |
| Apparent magnitude | magnitude 5.30 |
| Absolute magnitude | magnitude −2.74 |
| Spectral type | B3V |
| Surface temperature | 12,290 K |
| Luminosity | 2,140 L☉ |
| Radius | 10.2 R☉ |
| Mass | 8.13 M☉ (estimated) |
| Right ascension (J2000) | 21h 27m 21.4s |
| Declination (J2000) | +37° 07′ 00″ |
| Space velocity (relative to the Sun) | 20.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.30). Visible from the whole Northern Hemisphere and south to latitude 53° S. North of latitude 53° 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 701. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 24 million years.
The Sun seen from there
From a planet around 70 Cyg, the Sun would look like a star of magnitude 12.87, in the direction where our sky has the constellation Antlia. 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.