Upsilon1 Cancri
Upsilon1 Cancri is a solitary, yellow-white-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from υ1 Cancri, and abbreviated Upsilon1 Cnc or υ1 Cnc. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.7. Based upon an annual parallax shift of as seen from Earth, this system is distant from the Sun. It is drifting further away with a line of sight velocity of +19 km/s.
This object has a stellar classification of F0 IIIn, presenting as an F-type giant star. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s. It is a variable star of unknown type that changes brightness with an amplitude of 0.05 magnitude. The star is about 570 million years old and is spinning rapidly with a projected rotational velocity of 109.2 km/s. It has an estimated mass of 1.47 times that of the Sun and 3.2 times the Sun's radius. On average, it is radiating 25 times the Sun's luminosity from its photosphere at an effective temperature of.