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===55 Cancri b===

===55 Cancri b===

'''55 Cancri b''', sometimes caled '''55 Cancri Ab''' so to distinguish it from the companion star 55 Cancri B, is the first [[extrasolar planet]] discovered orbiting 55 Cancri A in 1996.  It is the fourth extrasolar world discovered overall.

'''55 Cancri b''', sometimes called '''55 Cancri Ab''' so to distinguish it from the companion star 55 Cancri B, is the first [[extrasolar planet]] discovered orbiting 55 Cancri A in 1996.  It is the fourth extrasolar world discovered overall.

The world has at least 82.4 percent (but probably 103 percent) of Jupiter's mass.  The planet is second in order of distance from its star, orbiting with an average distance of only 0.115 AU (an orbit that would be well within [[Mercury|Mercury's]]), taking only 14.7 days to complete.  The world appears to be a gas giant, and assuming that, its radius would be 1.2 times of [[Jupiter]], classifying the world as a "hot Jupiter".  Because the world was detected indirectly the actual radius, composition, and temperature at this time are still unknown.<ref name="exo">http://www.iop.org/EJ/article/1538-4357/474/2/L115/5590.html</ref>

The world has at least 82.4 percent (but probably 103 percent) of Jupiter's mass.  The planet is second in order of distance from its star, orbiting with an average distance of only 0.115 AU (an orbit that would be well within [[Mercury|Mercury's]]), taking only 14.7 days to complete.  The world appears to be a gas giant, and assuming that, its radius would be 1.2 times of [[Jupiter]], classifying the world as a "hot Jupiter".  Because the world was detected indirectly the actual radius, composition, and temperature at this time are still unknown.<ref name="exo">http://www.iop.org/EJ/article/1538-4357/474/2/L115/5590.html</ref>