Theta_Capricorni
Theta Capricorni
Star in the constellation Capricornus
Theta Capricorni, Latinized from θ Capricorni, is a white-hued star in the southern constellation of Capricornus,[10] positioned 0.58° south of the ecliptic.[11] Sometimes, this star is called by the name Dorsum,[12] meaning the back (of the goat) in Latin. It can be seen with the naked eye, having an apparent visual magnitude of +4.07.[2] Based upon an annual parallax shift of 20.11 mas as seen from the Earth,[1] the star is about 162 light years from the Sun. It is drifting closer with a radial velocity of −11 km/s.[4]
This is an ordinary A-type main sequence star with a stellar classification of A1 V.[3] Radial velocity variations indicate it may be a binary star system,[13] but when the system was examined in the infrared, no companion was detected.[14] Theta Capricorni has an estimated 2.24[6] times the mass of the Sun and around 2.7[7] times the Sun's radius. It is 152 million years old and is spinning fairly rapidly with a projected rotational velocity of 104 km/s.[6] The star is radiating 65[8] times the solar luminosity from its photosphere at an effective temperature of around 10,000 K.[6]