Upsilon Andromedae b ( abbreviated υ Andromedae b , υ And b ) , occasionally designated Upsilon Andromedae Ab ( to distinguish it from the red dwarf Upsilon Andromedae B ) , also named Saffar , is an extrasolar planet approximately 44 light @-@ years away from the Sun in the constellation of Andromeda . The planet orbits the Solar twin star , Upsilon Andromedae A , approximately every five days . Discovered in June 1996 by Geoffrey Marcy and R. Paul Butler , it was one of the first hot Jupiters to be discovered . It is also one of the first non @-@ resolved planets to be detected directly . Upsilon Andromedae b is the innermost known planet in its planetary system .