We report the detection of two new planets from the Anglo-Australian Planet Search .
These planets orbit two stars each previously known to host one planet .
The new planet orbiting HD 142 has a period of 6005 \pm 427 days , and a minimum mass of 5.3M _ { Jup } .
HD 142c is thus a new Jupiter analog : a gas-giant planet with a long period and low eccentricity ( e = 0.21 \pm 0.07 ) .
The second planet in the HD 159868 system has a period of 352.3 \pm 1.3 days , and m sin i =0.73 \pm 0.05 M _ { Jup } .
In both of these systems , including the additional planets in the fitting process significantly reduced the eccentricity of the original planet .
These systems are thus examples of how multiple-planet systems can masquerade as moderately eccentric single-planet systems .