2 Lupi

2 Lupi is a single star in the southern constellation of Lupus, located 326 light-years away from the Sun. It has the Bayer designation f Lupi; 2 Lupi is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.33. It is moving closer to the Earth with a heliocentric radial velocity of −3 km/s.

This is an aging giant star with a stellar classification of K0 IIIa CH-1. The suffix notation indicates abnormally weak lines of carbyne. Having exhausted the hydrogen at its core, the star evolved away from the main sequence by expanding to 11 times the Sun's radius. The star is radiating 65.6 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of $1.1$. It is a suspected variable star of unknown type.