Magnitude 3.41 Apparent magnitude (V) 3.41 B−V color index +0.92 | Constellation Lupus U−B color index +0.66 | |
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ζ Lupi (Latinised as Zeta Lupi) is a wide double star in the constellation Lupus, consisting of an orange-hued primary and a fainter secondary with a golden-yellow hue. It is visible to the naked eye with a combined apparent visual magnitude of 3.41. Based upon an annual parallax shift of 27.80 mas as seen from Earth, it is located 117.3 light years from the Sun.
This is a probable binary star system. As of 2013, the pair had an angular separation of 71.20 arc seconds along a position angle of 68.8°. The primary, component A, is an evolved G-type giant star with a visual magnitude of 3.50 and a stellar classification of G7 III. This is a red clump star, indicating that it is generating energy through the thermonuclear fusion of helium in its core region. Its measured angular diameter is 2.55±0.13 mas, which, at the estimated distance of Zeta Lupi, yields a physical size of about 10 times the radius of the Sun.
The secondary, component B, has a visual magnitude of 6.74.