Tags: Star.
Theta Lyrae (θ Lyr) is a star in a trinary star system in the constellation Lyra approximately 770 light years away from Earth. Theta Lyrae is an orange bright giant star of the spectral type K0II meaning it possesses a surface temperature of about 5000 kelvins and is many times bigger and brighter yet cooler than our Sun.It is orbited by a subsystem composed of BD+37° 3399 and BD+37° 3399B. 10th magnitude BD+37° 3399 is a giant star with a spectral type of K2III.