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Exoplanet List of exoplanets
Parent star
Star HAT-P-13
Constellation Ursa Major[1]
Right ascension (α) 08h 39m 31.810s[2]
Declination (δ) +47° 21′ 07.25″[2]
Apparent magnitude (mV) 10.62
Distance 698 ± 39[3] ly
(214 ± 12[3] 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 Archive data
Open Exoplanet Catalogue data

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 Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.  Vizier catalog entry
  3. ^ a b c d 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:0907.3525free to read. 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:1009.3598free to read. 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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