Delta Boötis, Latinized from δ Boötis, is a double star in the northern constellation of Boötes, forming the easternmost member of the constellation's kite-shaped asterism of brighter stars. Based upon parallax measurements, it is located at a distance of approximately 121.8 light-years (37.3 parsecs) from the Earth. This star is sometimes called Princeps /ˈprɪnsɛps/, meaning prince or prime in Latin. The origin of this name is unclear, although it usually appears in an astrological context. The apparent visual magnitude of this star is 3.5, making it visible to the naked eye even during a Full Moon. The magnitude 7.81 companion can be viewed in binoculars or a small telescope.