GSC 02620-00648

GSC 02620-00648 A is a magnitude 12 star located approximately 1400 light-years away in the constellation of Hercules. This star is about 1.18 times as massive as the Sun.

Planetary system
In 2006 the TrES program discovered exoplanet TrES-4 using the transit method. This planet orbits the primary star.

Binary star
In 2008 a study was undertaken of fourteen stars with exoplanets that were originally discovered using the transit method through relatively small telescopes. These systems were re-examined with the 2.2M reflector telescope at the Calar Alto Observatory in Spain. This star system, along with two others, was determined to be a previously unknown binary star system. The previously unknown secondary star is a dim magnitude 14 K or M-type star separated by about 755 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a recalculation of parameters for both the planet and the primary star.[