Star · G8V
Kepler-18
Kepler-18 is a main-sequence star of spectral type G8V in the constellation Cygnus, 1,412 light-years from the Sun. It is orbited by 3 confirmed exoplanet(s).
| Constellation | Cygnus |
|---|---|
| Distance | 1,412 light-years (433.0 pc) |
| Apparent magnitude | magnitude 13.77 |
| Absolute magnitude | magnitude 5.59 |
| Spectral type | G8V |
| Surface temperature | 5,350 K |
| Luminosity | 0.931 L☉ |
| Radius | 1.11 R☉ |
| Mass | 0.972 M☉ |
| Age | 10.0 billion years |
| Metallicity [Fe/H] | 0.19 |
| Right ascension (J2000) | 19h 52m 19.1s |
| Declination (J2000) | +44° 44′ 46″ |
| Space velocity (relative to the Sun) | 41.8 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.77. Visible from the whole Northern Hemisphere and south to latitude 45° S. North of latitude 45° 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 614. 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 Kepler-18, the Sun would look like a star of magnitude 13.01, in the direction where our sky has the constellation Puppis. It would be invisible to the naked eye.
Planets
- Kepler-18 b 3.5-day orbit · 2 R⊕
- Kepler-18 c 7.64-day orbit · 5.49 R⊕
- Kepler-18 d 14.9-day orbit · 6.98 R⊕
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.