High Quality Content by WIKIPEDIA articles! 47 Ursae Majoris b (sometimes abbreviated 47 Uma b) is an extrasolar planet approximately 46 light-years from Earth in the constellation of Ursa Major. The planet was discovered located in a long-period orbit around the star 47 Ursae Majoris in January 1996 and as of 2011 is the innermost of three known planets in its planetary system. It has a mass at least 2.53 times that of Jupiter.