Star · A3V
40 Cyg
40 Cyg is a main-sequence star of spectral type A3V in the constellation Cygnus, 269.6 light-years from the Sun.
| Other names | HIP 100907 |
|---|---|
| Constellation | Cygnus |
| Distance | 269.6 light-years (82.6 pc) |
| Apparent magnitude | magnitude 5.63 |
| Absolute magnitude | magnitude 1.04 |
| Spectral type | A3V |
| Surface temperature | 9,310 K |
| Luminosity | 40.6 L☉ |
| Radius | 2.45 R☉ |
| Mass | 2.62 M☉ (estimated) |
| Right ascension (J2000) | 20h 27m 34.3s |
| Declination (J2000) | +38° 26′ 25″ |
| Space velocity (relative to the Sun) | 29.6 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.63). Visible from the whole Northern Hemisphere and south to latitude 52° S. North of latitude 52° 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 1756. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 4.8 million years.
The Sun seen from there
From a planet around 40 Cyg, the Sun would look like a star of magnitude 9.42, in the direction where our sky has the constellation Vela. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 99454 17.4 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.