Kepler-18

Kepler-18
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 52m 19.0688s
Declination	+44° 44′ 46.808″
Apparent magnitude (V)	14.0
Characteristics
Spectral type	G7
Astrometry
Proper motion (μ)	RA: −1.436(14) mas/yr ; Dec.: −20.341(14) mas/yr
Parallax (π)	2.2804±0.0168 mas
Distance	1,430 ± 10 ly ; (439 ± 3 pc)
Details
Mass	0.972 ± 0.042 M☉
Radius	1.108 ± 0.051 R☉
Luminosity	0.93 L☉
Surface gravity (log g)	4.32 ± 0.12 cgs
Temperature	5383 ± 44 K
Metallicity [Fe/H]	0.19 ± 0.06 dex
Rotational velocity (v sin i)	<4 km/s
Age	10.0 ± 2.3 Gyr
Other designations
	KOI-137, KIC 8644288,2MASS J19521906+4444467, Gaia DR2 2079295583282164992
Database references
SIMBAD	data

Kepler-18 is a star with almost the same mass as the Sun in the Cygnus constellation.

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

Observation data Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19^h 52^m 19.0688^s^[1]
Declination	+44° 44′ 46.808″^[1]
Apparent magnitude (V)	14.0
Characteristics
Spectral type	G7
Astrometry

Proper motion (μ)	RA: −1.436(14) mas/yr^[1] Dec.: −20.341(14) mas/yr^[1]
Parallax (π)	2.2804±0.0168 mas^[1]
Distance	1,430 ± 10 ly (439 ± 3 pc)

Details^[2]

Mass	0.972 ± 0.042 `M`_☉
Radius	1.108 ± 0.051 `R`_☉
Luminosity	0.93 `L`_☉
Surface gravity (log g)	4.32 ± 0.12 cgs
Temperature	5383 ± 44 K
Metallicity [Fe/H]	0.19 ± 0.06 dex
Rotational velocity (v sin i)	<4 km/s
Age	10.0 ± 2.3 Gyr

Other designations
KOI-137, KIC 8644288,2MASS J19521906+4444467, Gaia DR2 2079295583282164992^[3]
Database references
SIMBAD	data

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	6.9 ± 3.4 $M$ _🜨	0.0447 ± 0.0006	3.504725 ± 0.000028	—	84.92 ± 0.26°	2.00 ± 0.10 $R$ _🜨
c	17.3 ± 1.9 $M$ _🜨	0.0752 ± 0.0011	7.6415716	—	87.68 ± 0.22°	5.49 ± 0.26 $R$ _🜨
d	16.4 ± 1.4 $M$ _🜨	0.1172 ± 0.0017	14.858941	—	88.07 ± 0.1°	6.98 ± 0.33 $R$ _🜨

Planetary system