HAT-P-13c

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.^[1] With a mass at least 15.2 times that of Jupiter, it may be a massive planet or a small brown dwarf.^[2] 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.^[3]

HAT-P-13c

Discovery
Discovered by	Bakos et al.
Discovery site	United States
Discovery date	21 July 2009
Detection method	Radial velocity
Orbital characteristics
Apastron	2.006 AU (300,100,000 km)
Periastron	0.366 AU (54,800,000 km)
Semi-major axis	1.186+0.018 −0.033 AU
Eccentricity	0.691 ± 0.018
Orbital period (sidereal)	428.5 ± 3 d 1.173 ± 0.008 y
Time of periastron	2454890.05 ± 0.48
Argument of periastron	176.7 ± 0.5
Star	HAT-P-13