Kepler-107

Kepler-107 is a star about 1,694 light-years (519 parsecs) away in the constellation Cygnus. It is a spectral type G2 star. No stellar companions were found as of 2016.^[6]

Kepler-107

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
Right ascension	19h 48m 06.77346s[2]
Declination	+48° 12′ 30.964″[2]
Apparent magnitude (V)	12.70[3]
Characteristics
Evolutionary stage	subgiant[2]
Spectral type	F6/G1 IV/V[3]
Apparent magnitude (B)	13.34[4]
Apparent magnitude (V)	12.70[4]
Apparent magnitude (J)	11.39[4]
Apparent magnitude (K)	11.06[4]
Astrometry
Radial velocity (Rv)	5.64423±0.00045[4] km/s
Proper motion (μ)	RA: −9.393 mas/yr[2] Dec.: 0.158 mas/yr[2]
Parallax (π)	1.9259±0.0092 mas[2]
Distance	1,694 ± 8 ly (519 ± 2 pc)
Details
Mass	1.238±0.029[4] M☉
Radius	1.447±0.014[4] R☉
Surface gravity (log g)	Spectroscopic: 4.28±0.10 cgs Asteroseismic: 4.210±0.013[4] cgs
Temperature	5854±61[4] K
Metallicity [Fe/H]	0.321±0.065[4] dex
Rotational velocity (v sin i)	3.6±0.5[4] km/s
Age	4.29+0.70 −0.56[4] Gyr
Other designations
Kepler-107, KOI-117, Gaia DR2 2086625752425381632, KIC 10875245, 2MASS J19480677+4812309[5]
Database references
SIMBAD	data

Planetary system

Kepler-107 has four known planets discovered in 2014.^{[7][8][9][10]} A giant impact is the likely origin of two planets in the system.^[4] Kepler-107 c is more than twice as dense (about 12.6 g cm⁻³) as the innermost exoplanet Kepler-107 b (about 5.3 g  cm⁻³).^[4]

The Kepler-107 planetary system^[11]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	3.8+1.8 −1.7 M🜨	0.04544±0.00036	3.1800218±0.0000029	<0.10	89.05±0.67°	1.536±0.025 R🜨
c	10.0±2.0 M🜨	0.06064±0.00048	4.901452±0.0	<0.080	89.49+0.34 −0.44°	1.597±0.026 R🜨
d	<7.7 M🜨	0.08377±0.00065	7.95839±0.00012	<0.11	87.55+0.64 −0.48°	0.860±0.060 R🜨
e	14.1±3.3 M🜨	0.12638±0.00099	14.749143±0.000019	<0.10	89.67±0.22°	2.903±0.035 R🜨