Research topic: Arcturus

Arcturus , brightest star in the constellation Boötes and 4th-brightest star in the entire sky; Bayer designation Alpha Boötis; 1992 position R.A. 14 h 15.3 m , Dec. +19°13'. An orange giant of spectral class K2 III, it has an apparent magnitude of -0.06; its diameter is about 10 times that of the sun and its luminosity about 100 times that of the sun. Arcturus is one of the nearest giant stars, at a distance of about 36 light-years, and has one of the largest proper motions (annual angular shift in position) of the bright stars. Its name is from the... Read more