13_Capricorni
Tau1 Capricorni
Star in the constellation Capricornus
Tau1 Capricorni (τ1 Cap, τ1 Capricorni) is a star in the constellation Capricornus. It has an apparent magnitude of 6.76,[2] making it readily visible in binoculars, but not to the naked eye. Located approximately 750 light years from Earth,[1] the star is receding with a heliocentric radial velocity of 18.5 km/s.[5] Due to its location near the ecliptic, τ1 Cap can be occulted by the Moon and rarely planets.[8]
τ1 Capricorni has a stellar classification of K1 III, indicating that it is an ageing K-type giant.[3] At present it has 118% the mass of the Sun[6] and an enlarged radius of 25 solar radii.[7] It shines at 191 times the luminosity of the Sun[7] from its photosphere at an effective temperature of 4272 K.[6] τ1 Cap's metallicity – elements heavier than helium – is at solar level.[6]