 Even when this planet was taken into account , there still remained significant residuals in the radial velocity measurements , and it was suggested there might be a second planet in orbit . In 1999 , astronomers at both San Francisco State University and the Harvard @-@ Smithsonian Center for Astrophysics independently concluded that a three @-@ planet model best fit the data . The two outer planets were designated Upsilon Andromedae c and Upsilon Andromedae d in order of increasing distance from the star . Both of these planets are in more eccentric orbits than any of the planets in the Solar System ( including Pluto ) . Upsilon Andromedae d resides in the system 's habitable zone . 
