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
Felis (constellation) in the List of IAU-approved Star Names. Felis (constellation) Felis (Latin for "cat") was a constellation created by French astronomer Jérôme Lalande in 1799. He chose the name partly because, as a cat lover, he felt sorry that there was not yet a cat among the constellations (although there are two lions and a lynx). It was between the constellations of Antlia and Hydra. This constellation was first depicted in the "Uranographia sive Astrorum Descriptio" (1801) of Johann Elert Bode. It is now obsolete. Its brightest star, HD 85951, was named "Felis" by the International Astronomical Union on 1 June