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A blue star in the southern parts of the constellation Lupus, the Wolf. Sigma Lupi is on the band of the Milky Way, near Lupus' border with Centaurus (it is relatively close to Alpha Centauri, a little over ten degrees to the south).
Sigma Lupi is a variable star, with an apparent magnitude that oscillates slightly around +4.43. This is due to the fact that it is a close binary system, and the brightness of the system as a whole shifts as its component stars orbit one another. Though relatively faint in the skies of Earth, it is also distant at some 575 light years; at a distance of ten parsecs it would be approximately as bright as the planet Jupiter.
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