Tags: Star.
Rho Boötis (ρ Boo ρ Boötis) is a star in the northern constellation Boötes. Based upon parallax measurements it is located at a distance of approximately 149 light-years (46 parsecs) from Earth.This is an orange K-type giant with an apparent magnitude of +3.57. Since 1943 the spectrum of this star has served as one of the stable anchor points by which other stars are classified.