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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.[6]
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 | |
Database references | |
SIMBAD | data |
KIC | data |
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]
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🜨 |
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