Article · Wikipedia archive · Last revised Jun 30, 2026

Kepler-30

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″. With an apparent visual magnitude of 15.5, this star is too faint to be seen with the naked eye. Kepler-30 is exhibiting a strong starspot activity.

Last revised
Jun 30, 2026
Read time
≈ 3 min
Length
656 w
Citations
26
Source
Wikipedia ↗
Kepler-30
Observation data
Epoch J2000      Equinox J2000
Constellation Lyra1
Right ascension 19h 01m 08.0746s2
Declination +38° 56′ 50.218″2
Apparent magnitude (V) 15.53
Characteristics
Evolutionary stage main sequence2
Spectral type G3V3
Astrometry
Proper motion (μ) RA: 0.743(29) mas/yr2
Dec.: −4.737(28) mas/yr2
Parallax (π)1.1113±0.0241 mas2
Distance2,930 ± 60 ly
(900 ± 20 pc)
Details
Mass0.99±0.084 M☉
Radius0.954 R☉
Luminosity0.585 L☉
Surface gravity (log g)4.535 cgs
Temperature5,498±544 K
Metallicity [Fe/H]0.18±0.274 dex
Rotation16.004±0.017 days6
Rotational velocity (v sin i)1.94±0.224 km/s
Age1.95 Gyr
Other designations
KOI-806, KIC 3832474, UCAC2 45365178, 2MASS J19010807+3856502, SDSS J190108.07+385650.2
Database references
SIMBADdata
Exoplanet Archivedata
KICdata

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

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

The Kepler-30 planetary system12
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

References

  1. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. Schneider, Jean, "Star: Kepler-30", Extrasolar Planets Encyclopaedia, archived from the original on 2012-05-05, retrieved 2013-12-18
  4. Kepler-30b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
  5. Mathur, Savita; Claytor, Zachary R.; Santos, Ângela R. G.; García, Rafael A.; Amard, Louis; Bugnet, Lisa; Corsaro, Enrico; Bonanno, Alfio; Breton, Sylvain N.; Godoy-Rivera, Diego; Pinsonneault, Marc H.; Van Saders, Jennifer (2023). "Magnetic Activity Evolution of Solar-like Stars. I. S ph-Age Relation Derived from Kepler Observations". The Astrophysical Journal. 952 (2): 131. arXiv:2306.11657. Bibcode:2023ApJ...952..131M. doi:10.3847/1538-4357/acd118.
  6. 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. arXiv:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11.
  7. Sanchis-Ojeda, Roberto; Fabrycky, Daniel C.; Winn, Joshua N.; Barclay, Thomas; Clarke, Bruce D.; Ford, Eric B.; Fortney, Jonathan J.; Geary, John C.; Holman, Matthew J.; Howard, Andrew W.; Jenkins, Jon M.; Koch, David; Lissauer, Jack J.; Marcy, Geoffrey W.; Mullally, Fergal; Ragozzine, Darin; Seader, Shawn E.; Still, Martin; Thompson, Susan E. (2012), "Alignment of the stellar spin with the orbits of a three-planet system", Nature, 487 (7408): 449–453, arXiv:1207.5804, Bibcode:2012Natur.487..449S, doi:10.1038/nature11301, PMID 22836999, S2CID 685995
  8. 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. arXiv:1102.0541. Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19.
  9. Tingley, B.; Palle, E.; Parviainen, H.; Deeg, H. J.; Zapatero Osorio, M. R.; Cabrera-Lavers, A.; Belmonte, J. A.; Rodriguez, P. M.; Murgas, F.; Ribas, I. (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, arXiv:1111.5107, Bibcode:2011A&A...536L...9T, doi:10.1051/0004-6361/201118264, S2CID 119226419
  10. Fabrycky, Daniel C.; et al. (2012), "Transit Timing Observations from Kepler. IV. Confirmation of Four Multiple-planet Systems by Simple Physical Models", The Astrophysical Journal, 750 (2): 114, arXiv:1201.5415, Bibcode:2012ApJ...750..114F, doi:10.1088/0004-637X/750/2/114
  11. Detection of Laplace-resonant three-planet systems from transit timing variations
  12. 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. arXiv:1707.04962. Bibcode:2018MNRAS.478.2480P. doi:10.1093/mnras/sty1071. S2CID 76654017.