Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. BD+20°1790 is a young late orange dwarf star in the constellation Gemini, located nearly 85 light years away from Sun. The star is young and very active and is a member of the AB Doradus Moving Group. The star has also been studied and monitored by SuperWASP group and found to coincide with the ROSAT source 1RXS J072343.6+202500. The planet candidate was announced in December 2009. The Keplerian fit of the RV data suggested an orbital solution for a close-in massive planet with an orbital period of 7.7834 days.