HD 89744 is an F7 V star with mass 1.4 M _ { \odot } , effective temperature 6166 K , age 2.0 Gy and metallicity [ Fe/H ] = 0.18 .
The radial velocity of the star has been monitored with the AFOE spectrograph at the Whipple Observatory since 1996 , and evidence has been found for a low mass companion .
The data were complemented by additional data from the Hamilton spectrograph at Lick Observatory during the companion ’ s periastron passage in fall 1999 .
As a result , we have determined the star ’ s orbital wobble to have period P = 256 d , orbital amplitude K = 257 m/s , and eccentricity e = 0.7 .
From the stellar mass we infer that the companion has minimum mass m _ { 2 } \sin i~ { } = 7.2 M _ { JUP } in an orbit with semi-major axis a _ { 2 } = 0.88 AU .
The eccentricity of the orbit , among the highest known for extra-solar planets , continues the trend that extra-solar planets with semi-major axes greater than about 0.15 AU tend to have much higher eccentricities than are found in our solar system .
The high metallicity of the parent star reinforces the trend that parent stars of extra-solar planets tend to have high metallicity .