Lambda Lupi

Lambda Lupi, Latinized from λ Lupi, is a triple star system in the southern constellation of Lupus. It is visible to the naked eye with a combined apparent visual magnitude of 4.04. Based upon an annual parallax shift of just 4.20 mas as seen from Earth, it is located roughly 800 light years from the Sun. The system has a peculiar velocity of $9.8$ relative to its neighbors, making it a candidate runaway star system. It is a member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association.

The two visible components of this system orbit each other over a period of 70.8 years with a large eccentricity of 0.63. The primary component has a visual magnitude of 4.43, while the secondary is of magnitude 5.23. Both are B-type main sequence stars with a stellar classification of B3 V. One of the pair is itself a double-lined spectroscopic binary, making this a triple star system.