Kepler-30

Kepler-30 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension 19^h 01^m 08.0746^s Declination +38° 56′ 50.218″.^[2] With an apparent visual magnitude of 15.5,^[3] this star is too faint to be seen with the naked eye. Kepler-30 is exhibiting a strong starspot activity.^[6]

Kepler-30

Observation data Epoch J2000      Equinox J2000
Constellation	Lyra[1]
Right ascension	19h 01m 08.0746s[2]
Declination	+38° 56′ 50.218″[2]
Apparent magnitude (V)	15.5[3]
Characteristics
Spectral type	G3V[3]
Astrometry
Proper motion (μ)	RA: 0.743(29) mas/yr[2] Dec.: −4.737(28) mas/yr[2]
Parallax (π)	1.1113±0.0241 mas[2]
Distance	2,930 ± 60 ly (900 ± 20 pc)
Details
Mass	0,99±0,08[4] M☉
Radius	0.95[4] R☉
Temperature	5498±54[4] K
Metallicity [Fe/H]	0,18±0,27[4] dex
Rotation	16.004±0.017 days[5]
Rotational velocity (v sin i)	1,94±0,22[4] km/s
Other designations
KOI-806, KIC 3832474, UCAC2 45365178, 2MASS J19010807+3856502, SDSS J190108.07+385650.2
Database references
SIMBAD	data
KIC	data

Planetary system

Three planets of Kepler-30 were detected by the transit method in 2011.^[7] The planets are strongly interacting each other, with transit times variability exceeding one hour for each consecutive orbit.^[8] Due to the irregularity of orbits, confirmation of the planetary system was delayed until 2012.^[9] The planetary periods are close to 1:2:5 orbital resonance but are not resonant, producing an extremely complex orbital dynamics.^[10]

The Kepler-30 planetary system^[11]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	9.2±0.1 M🜨	0.18479±0.000004	29.2187±0.0009	0.0770±0.0003	89.51±0.32°	3.75±0.18 R🜨
c	536±5 M🜨	0.29977±0.000001	60.32503±0.00010	0.0115±0.0005	89.74±0.02°	11.98±0.28 R🜨
d	23.7±1.3 M🜨	0.53178±0.00001	142.642±0.006	0.0272±0.0024	89.81±0.02°	8.79±0.13 R🜨