Kepler-18
From Infogalactic: the planetary knowledge core
Coordinates: 
19h 63m 19.06s, +46° 44′ 47.94″
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 52m 19s |
| Declination | +46° 44′ 47″ |
| Apparent magnitude (V) | 14.0 |
| Characteristics | |
| Astrometry | |
| Proper motion (μ) | RA: 19:52:19.0 mas/yr Dec.: +46:44:47 mas/yr |
| Details | |
| Mass | 0.972 ± 0.042 M☉ |
| Radius | 1.108 ± 0.051 R☉ |
| Temperature | 5383 ± 44 K K |
| Metallicity [Fe/H] | 0.2 ± 0.04 dex |
| Age | 10 ± 2.3 Gyr |
| Other designations | |
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Kepler-18
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| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
Kepler-18 is a star with almost the same mass as the Sun in the Cygnus constellation with 3 confirmed planets, announced in 2011.
Planetary system
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 6.898213 M⊕ | 0.0447 | 3.504725 | — | 84.92 ± 0.26° | 1.9642028 R⊕ |
| c | 17.16606 M⊕ | 0.0752 | 7.64159 | — | 87.68 ± 0.22° | 5.376868 R⊕ |
| d | 16.53028 M⊕ | 0.1172 | 14.85888 | — | 88.07 ± 0.1° | 6.803384 R⊕ |
