Star · G4V
Kepler-640
Kepler-640 is a main-sequence star of spectral type G4V in the constellation Cygnus, 1,819 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Cygnus |
|---|---|
| Distance | 1,819 light-years (557.8 pc) |
| Apparent magnitude | magnitude 13.89 |
| Absolute magnitude | magnitude 5.16 |
| Spectral type | G4V |
| Surface temperature | 5,650 K |
| Luminosity | 0.947 L☉ |
| Radius | 0.94 R☉ |
| Mass | 1.01 M☉ |
| Age | 2.1 billion years |
| Metallicity [Fe/H] | 0.15 |
| Right ascension (J2000) | 19h 44m 07.7s |
| Declination (J2000) | +42° 07′ 54″ |
| Space velocity (relative to the Sun) | 39.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.89. Visible from the whole Northern Hemisphere and south to latitude 48° S. North of latitude 48° 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 207. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 32 million years.
The Sun seen from there
From a planet around Kepler-640, the Sun would look like a star of magnitude 13.56, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-640 b 22.2-day orbit · 2.56 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.