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Exoplanet List of exoplanets
Parent star
Star HAT-P-13
Constellation Ursa Major[1]
Right ascension (α) 08h 39m 31.8074s[2]
Declination (δ) +47° 21′ 07.276″[2]
Apparent magnitude (mV) 10.62
Distance811±7[2] ly
(249±2[2] pc)
Spectral type G4V[3]
Orbital elements
Semi-major axis(a) 1.186+0.018
Periastron (q) 0.366 AU
Apastron (Q) 2.006 AU
Eccentricity (e) 0.691 ± 0.018
Orbital period(P) 428.5 ± 3 d
(1.173 ± 0.008 y)
Argument of
(ω) 176.7 ± 0.5°
Time of periastron (T0) 2454890.05 ± 0.48 JD
Physical characteristics
Minimum mass(m sin i)15.2 ± 1 MJ
Discovery information
Discovery date 21 July 2009
Discoverer(s) Bakos et al.
Discovery method Radial velocity
Discovery site  United States
Discovery status Confirmed
Database references
Extrasolar Planets
Exoplanet Archivedata
Open Exoplanet Cataloguedata

HAT-P-13c is a substellar object orbiting the star HAT-P-13 located 698 light years away from Earth in the constellation of Ursa Major. A search for transits was negative, however only 72% of the possible transit configurations could be ruled out.[4] With a mass at least 15.2 times that of Jupiter, it may be a massive planet or a small brown dwarf.[3] The gravitational effect of this object on the inner transiting planet HAT-P-13b may allow a precise determination of the inner planet's internal structure.[5]


  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 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 Bakos, G. Á.; et al. (2009). "HAT-P-13b,c: A Transiting Hot Jupiter with a Massive Outer Companion on an Eccentric Orbit". The Astrophysical Journal. 707 (1): 446–456. arXiv:0907.3525Freely accessible. Bibcode:2009ApJ...707..446B. doi:10.1088/0004-637X/707/1/446. 
  4. ^ Szabó, Gy. M.; et al. (2010). "A multi-site campaign to detect the transit of the second planet in HAT-P-13". Astronomy and Astrophysics. 523. A84. arXiv:1009.3598Freely accessible. Bibcode:2010A&A...523A..84S. doi:10.1051/0004-6361/201015172. 
  5. ^ ATYGIN K., BODENHEIMER P. & LAUGHLIN G. , 2009 "Determination of the Interior Structure of Transiting Planets in Multiple-Planet Systems" ApJ. Letters 2009 preprint

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