Kepler-18
From Infogalactic: the planetary knowledge core
(Redirected from Kepler-18b)
Coordinates: 19h 63m 19.06s, +46° 44′ 47.94″
|
|
Observation data Epoch J2000 Equinox J2000 |
|
---|---|
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 | |
Kepler-18
|
|
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⊕ |