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. Bibcode2018A&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. Bibcode2013ApJ...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, Bibcode2012Natur.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. Bibcode2011ApJ...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, Bibcode2011A&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, Bibcode2012ApJ...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. Bibcode2018MNRAS.478.2480P. 

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