1_Lupi
1 Lupi
Star in the constellation Lupus
1 Lupi is a solitary[11] giant star in the southern constellation of Lupus. It has the Bayer designation i Lupi; 1 Lupi is the Flamsteed designation. The apparent visual magnitude is 4.90,[2] which indicates it is faintly visible to the naked eye. Based on parallax measurements, this star is approximately 1,800 light-years from the Sun.[1] It is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.[6]
Houk (1978) assigned the spectral classification of this star as F1III,[3] which suggests it is an F-type (yellow-white) star that has evolved away from the main sequence and expanded into a giant. However, Gray et al. (2001) found a class of F0 Ib-II,[4] matching a supergiant/bright giant star. It has a mass around seven times that of the Sun[8] and has expanded to 41[1] times the Sun's radius. The star is radiating 2,900[9] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 6,867 K.[6] The estimated age of the star is around 47 million years.[8]