The Okayama Planet Search Program (OPSP) was started in 2001 with the goal of spectroscopically searching for planetary systems around stars. It reported on the detection of 3 new
extrasolar planets: (
18 Delphini b,
xi Aql b, and
41 Lyncis b), around intermediate-mass G and
K giants18 Delphini,
Xi Aquilae, and
HD 81688. Also, it updated the orbital parameters of
HD 104985 b, the first planet discovered around the
G giants from the survey, by using the data collected during the past six years. Since 2001, it has been conducting a precise
Dopplersurvey of about 300 G and K giants using a 1.88m telescope, the High Dispersion Echelle Spectrograph (
HIDES), and an iodine absorption cell
I2 cell at the
Okayama Astrophysical Observatory (OAO).
