47 Ursae Majoris d (sometimes abbreviated 47 Uma d) is an extrasolar planet approximately 46 light-years away in the constellation of Ursa Major. The planet was discovered located in a long-period orbit (38 years) around the star 47 Ursae Majoris. As of 2011, it is the outermost of three known planets in its planetary system. It has a mass of at least 1.64 times that of Jupiter. It is the longest-period planet detected by Doppler spectroscopy. The evidence of this planet was found by Bayesian Kepler periodogram in March 2010.^[1]

47 Ursae Majoris d

An artist's impression of 47 UMa d
Discovery
Discovered by	Gregory and Fischer
Discovery site	United States
Discovery date	6 March 2010
Detection method	Doppler spectroscopy (Bayesian Kepler periodogram)
Orbital characteristics
Semi-major axis	11.6+2.1 −2.9[1] AU
Eccentricity	0.16+0.09 −0.16[1]
Orbital period (sidereal)	14,002+4018 −5095[1] d ~38.33 y
Time of periastron	2,451,736+6783 −5051[1]
Argument of periastron	110+132 −160[1]
Star	47 Ursae Majoris