Nu1 Boötis
Nu1 Boötis is an orange-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinized from ν1 Boötis, and abbreviated Nu1 Boo or ν1 Boo. This star has an apparent visual magnitude of +5.02, which is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of as seen from Earth, it is located approximately 970 light years distant from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction of 0.13 due to interstellar dust. It is drifting closer to the Sun with a radial velocity of −11.1 km/s.
This is an evolved K-type giant star with a stellar classification of. The 'Ba0.4' suffix notation indicates this is a weak barium star, which means that the stellar atmosphere has been enhanced by s-process elements most likely provided by what is now an orbiting white dwarf companion. The giant component has 99.8 times the radius of the Sun. It is radiating 2,054 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 3,917 K.
Ptolemy considered Nu Boötis to be shared by Hercules, and Bayer assigned it a designation in both constellations: Nu Boötis and Psi Herculis. When the modern constellation boundaries were fixed in 1930, the latter designation dropped from use.