Kepler-30
Yellow star in the constellation Lyra
From Wikipedia, the free encyclopedia
Kepler-30 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension 19h 01m 08.0746s 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.[7]
| 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 | |
| Evolutionary stage | main sequence[2] |
| 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☉ |
| Luminosity | 0.58[5] L☉ |
| Surface gravity (log g) | 4.53[5] cgs |
| Temperature | 5,498±54[4] K |
| Metallicity [Fe/H] | 0.18±0.27[4] dex |
| Rotation | 16.004±0.017 days[6] |
| Rotational velocity (v sin i) | 1.94±0.22[4] km/s |
| Age | 1.9[5] Gyr |
| Other designations | |
| KOI-806, KIC 3832474, UCAC2 45365178, 2MASS J19010807+3856502, SDSS J190108.07+385650.2 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| KIC | data |
Planetary system
Three planets of Kepler-30 were detected by the transit method in 2011.[8] The planets are strongly interacting each other, with transit times variability exceeding one hour for each consecutive orbit.[9] Due to the irregularity of orbits, confirmation of the planetary system was delayed until 2012.[10] The planetary periods are close to 1:2:5 orbital resonance but are not resonant, producing an extremely complex orbital dynamics.[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🜨 |