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Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra[1]
Right ascension 19h 07m 53.1397s[2]
Declination 46° 52′ 05.931″[2]
Apparent magnitude (V) 9.95[3] (KOI-13A=10.33[4])
Spectral type A0
Proper motion (μ) RA: −4.401±0.187[2] mas/yr
Dec.: −15.780±0.237[2] mas/yr
Parallax (π)1.9053 ± 0.1051[2] mas
Distance1,710 ± 90 ly
(520 ± 30 pc)
Mass1.72±0.10 M
Radius1.71±0.04 R
Surface gravity (log g)4.2±0.5 cgs
Temperature7650±250 K
Metallicity [Fe/H]0.2±0.2 dex
Rotational velocity (v sin i)78±15 km/s
Age0.5±0.1 Gyr
Mass1.68±0.10 M
Radius1.68±0.04 R
Surface gravity (log g)4.2±0.5 cgs
Temperature7530±250 K
Metallicity [Fe/H]0.2±0.2 dex
Rotational velocity (v sin i)69±13 km/s
Age0.5±0.1 Gyr
Other designations
BD+46 2629, ADS 12085 AB, WDS J19079+4652AB, KOI-13, KIC 9941662, 2MASS J19075308+4652061[3]
Database references

Kepler-13 or KOI-13 is a stellar triple star system consisting of Kepler-13A, around which an orbiting hot Jupiter exoplanet was discovered with the Kepler spacecraft in 2011, and Kepler-13B a common proper motion companion star which has an additional star orbiting it.[6]

Stellar system[edit]

The multiple nature of the system was discovered in 1904 by Robert Grant Aitken at Lick Observatory. He measured a separation between the A and B components of approximately one arc second and position angle of 281.3° with the 36" James Lick telescope.[7] The position of the two visual components of the system relative to each other has remained constant since 1904.[8] Radial velocity measurements taken with the SOPHIE échelle spectrograph at the Haute-Provence Observatory revealed an additional companion orbiting Kepler-13B. This companion has a mass of between 0.4 and 1 times that of the Sun and orbits with a period of 65.831 days with an eccentricity of 0.52[6]

Planetary system[edit]

Kepler-13 was identified as one of 1235 planetary candidates with transit-like signatures in the first four months of Kepler data.[9] It was confirmed as a planet by measuring the Doppler beaming affect on the Kepler light curve.[10] The planet that has been confirmed, having a radius of between 1.5 and 2.6 RJ, is also one of the largest known exoplanets.

The Kepler-13 planetary system[11]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 9.28±0.16 MJ 0.03641±0.00087 1.763588±0.000001 0.00064+0.00012
2.216±0.087 RJ


  1. ^ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034.  Vizier query form
  2. ^ a b c d e Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; et al. (Gaia Collaboration) (April 2018). "Gaia Data Release 2. Summary of the contents and survey properties". Astronomy & Astrophysics. arXiv:1804.09365Freely accessible. Bibcode:2018arXiv180409365G. doi:10.1051/0004-6361/201833051.  Gaia Data Release 2 catalog entry
  3. ^ a b "Kepler-13". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-07. 
  4. ^ Howarth, Ian D.; Morello, Giuseppe (2017). "Rapid rotators revisited: Absolute dimensions of KOI-13". Monthly Notices of the Royal Astronomical Society. 470: 932–939. arXiv:1705.07302Freely accessible. Bibcode:2017MNRAS.470..932H. doi:10.1093/mnras/stx1260. 
  5. ^ Shporer, Avi; et al. (2014). "Atmospheric Characterization of the Hot Jupiter Kepler-13Ab". The Astrophysical Journal. 788. 92. arXiv:1403.6831Freely accessible. Bibcode:2014ApJ...788...92S. doi:10.1088/0004-637X/788/1/92. 
  6. ^ a b Santerne, A.; et al. (2012). "SOPHIE velocimetry of Kepler transit candidates. VI. An additional companion in the KOI-13 system". Astronomy and Astrophysics. 544. L12. arXiv:1207.1715Freely accessible. Bibcode:2012A&A...544L..12S. doi:10.1051/0004-6361/201219899. 
  7. ^ Aitken, Robert Grant (1904). "Measures of one hundred fifty-five new double stars". Lick Observatory Bulletin. 3: 6–18. Bibcode:1904LicOB...3....6A. doi:10.5479/ADS/bib/1904LicOB.3.6A. 
  8. ^ Szabó, Gy. M.; et al. (2011). "Asymmetric Transit Curves As Indication of Orbital Obliquity: Clues from the Late-Type Dwarf Companion in Koi-13". The Astrophysical Journal Letters. 736. L4. arXiv:1105.2524Freely accessible. Bibcode:2011ApJ...736L...4S. doi:10.1088/2041-8205/736/1/L4. 
  9. ^ 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:1102.0541Freely accessible. Bibcode:2011ApJ...736...19B. doi:10.1088/0004-637X/736/1/19. 
  10. ^ Shporer, Avi; et al. (2011). "Detection of Koi-13.01 Using the Photometric Orbit". The Astronomical Journal. 142 (6). 195. arXiv:1110.3510Freely accessible. Bibcode:2011AJ....142..195S. doi:10.1088/0004-6256/142/6/195. 
  11. ^ Esteves, Lisa J.; Mooij, Ernst J. W. De; Jayawardhana, Ray (2015). "Changing Phases of Alien Worlds: Probing Atmospheres Of Kepler planets with High-Precision Photometry". The Astrophysical Journal. 804 (2). 150. arXiv:1407.2245Freely accessible. Bibcode:2015ApJ...804..150E. doi:10.1088/0004-637X/804/2/150. 

Coordinates: Sky map 19h 07m 33.107s, +46° 52′ 5.95″