Tau1 Capricorni

Tau1 Capricorni (τ1 Cap, τ1 Capricorni) is a star in the constellation Capricornus. It has an apparent magnitude of 6.76, making it readily visible in binoculars, but not to the naked eye. Located approximately 750 light years from Earth, the star is receding with a heliocentric radial velocity of $18.5 km/s$. Due to its location near the ecliptic, τ1 Cap can be occulted by the Moon and rarely planets.

τ1 Capricorni has a stellar classification of K1 III, indicating that it is an ageing K-type giant. At present it has 118% the mass of the Sun and an enlarged radius of $25 solar radii$. It shines at 191 times the luminosity of the Sun from its photosphere at an effective temperature of $4,272 K$. τ1 Cap's metallicity – elements heavier than helium – is at solar level.