Beta Boötis the ROSAT satellite was used to observe an X-ray flare on Beta Boötis, which released an estimated . This was the first such observation for a low-activity star of this type. The flare may be explained by an as yet unobserved M-type dwarf companion star. Beta Boötis Beta Boötis (β Boötis, abbreviated Beta Boo, β Boo), also named Nekkar, is a star in the northern constellation of Boötes. It has an apparent visual magnitude of 3.5, making it one of the brighter members of the constellation. In the modern constellation, it marks the head of Boötis the herdsman. Based upon
Auriga (constellation) of three constellations which represented poles for horses to be tethered. They were formed by the triplets of Epsilon, Zeta, and Eta Aurigae; Nu, Tau, and Upsilon Aurigae; and Chi and 26 Aurigae, with one other undetermined star. "Xianchi", the pond where the sun set and "Tianhuang", a pond, bridge, or pier, were other constellations in Auriga, though the stars that composed them are undetermined. "Zuoqi", representing chairs for the emperor and other officials, was made up of nine stars in the east of the constellation. "Bagu", a constellation mostly formed from stars in Camelopardalis representing different types of crops,