Astronomy:Kepler-30

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Short description: Orangish star in the constellation Lyra
Kepler-30
Observation data
Equinox J2000.0]] (ICRS)
Constellation Lyra[1]
Right ascension  19h 01m 08.0747s[2]
Declination +38° 56′ 50.219″[2]
Apparent magnitude (V) 15.5[3]
Characteristics
Spectral type K[3]
Astrometry
Proper motion (μ) RA: 0.695±0.055[2] mas/yr
Dec.: −4.761±0.052[2] mas/yr
Parallax (π)1.0657 ± 0.0321[2] mas
Distance3,060 ± 90 ly
(940 ± 30 pc)
Details
Mass0,99±0,08[4] M☉
Radius0.95[4] R☉
Temperature5498±54[4] K
Metallicity [Fe/H]0,18±0,27[4] dex
Rotation16.004±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
SIMBADdata
KICdata

Kepler-30 is a star in the northern constellation of Lyra. It is located at the celestial coordinates: Right Ascension  19h 01m 08.0747s Declination +38° 56′ 50.219″.[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]

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 irregularity of orbits, confirmation of 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⊕

References

  1. ↑ "Lyra – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#lyr, retrieved 2011-12-15 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Schneider, Jean, Star: Kepler-30, http://exoplanet.eu/star.php?st=Kepler-30, retrieved 2013-12-18 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 Kepler-30b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler30b/, retrieved 2011-12-06 
  5. ↑ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters 775 (1): L11. doi:10.1088/2041-8205/775/1/L11. Bibcode: 2013ApJ...775L..11M. 
  6. ↑ Sanchis-Ojeda, Roberto; Fabrycky, Daniel C.; Winn, Joshua N.; Barclay, Thomas; Clarke, Bruce D.; Ford, Eric B.; Fortney, Jonathan J.; Geary, John C. et al. (2012), "Alignment of the stellar spin with the orbits of a three-planet system", Nature 487 (7408): 449–453, doi:10.1038/nature11301, PMID 22836999, Bibcode: 2012Natur.487..449S 
  7. ↑ Borucki, William J. et al. (2011). "Characteristics of Planetary Candidates Observed by Kepler. II. Analysis of the First Four Months of Data". The Astrophysical Journal 736 (1): 19. doi:10.1088/0004-637X/736/1/19. Bibcode: 2011ApJ...736...19B. 
  8. ↑ Tingley, B.; Palle, E.; Parviainen, H.; Deeg, H. J.; Zapatero Osorio, M. R.; Cabrera-Lavers, A.; Belmonte, J. A.; Rodriguez, P. M. et al. (2011), "Detection of transit timing variations in excess of one hour in the Kepler multi-planet candidate system KOI 806 with the GTC", Astronomy & Astrophysics 536: L9, doi:10.1051/0004-6361/201118264, Bibcode: 2011A&A...536L...9T 
  9. ↑ Fabrycky, Daniel C.; Ford, Eric B.; Steffen, Jason H.; Rowe, Jason F.; Carter, Joshua A.; Moorhead, Althea V.; Batalha, Natalie M.; Borucki, William J. et al. (2012), "TRANSIT TIMING OBSERVATIONS FROM Kepler : IV. CONFIRMATION OF 4 MULTIPLE PLANET SYSTEMS BY SIMPLE PHYSICAL MODELS", The Astrophysical Journal 750 (2): 114, doi:10.1088/0004-637X/750/2/114, Bibcode: 2012ApJ...750..114F 
  10. ↑ Detection of Laplace-resonant three-planet systems from transit timing variations
  11. ↑ Panichi, F et al. (2018). "The architecture and formation of the Kepler-30 planetary system". Monthly Notices of the Royal Astronomical Society 478 (2): 2480–2494. doi:10.1093/mnras/sty1071. Bibcode: 2018MNRAS.478.2480P. 

Coordinates: Sky map 19h 01m 08.076s, +38° 56′ 50.26″



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