11 Ursae Minoris b

11 Ursae Minoris b is an extrasolar planet which orbits the K-type giant star 11 Ursae Minoris, located approximately 390 light years away in the constellation Ursa Minor. This planet has a minimum mass of 10.5 M_J. Since inclination is not known, the actual mass is unknown. This planet may actually be a brown dwarf if a true mass is over 13 times that of Jupiter. This planet takes 17 months to orbit the star at the average distance of 1.54 AU in a circular orbit. This superjovian planet was detected by radial velocity method on August 12, 2009.^[2]

11 Ursae Minoris b

Discovery
Discovered by	Döllinger et al.
Discovery site	TLS
Discovery date	August 12, 2009
Detection method	Radial velocity
Orbital characteristics
Semi-major axis	1.54 ± 0.07 AU (230,000,000 ± 10,000,000 km)
Eccentricity	0.08 ± 0.03
Orbital period (sidereal)	516.22 ± 3.25 d 1.4133 ± 0.0089 y
Time of periastron	2452861.05 ± 2.06
Argument of periastron	117.63 ± 21.06
Star	11 Ursae Minoris
Proper orbital elements
Proper semi-major axis	1.54±0.07 AU
Proper eccentricity	0.08±0.03
Physical characteristics
Mass	11.2±0.2 MJ[1]