Kakkab (Alpha Lupi)
Kakkab is a hot giant B star belonging to the Upper Centaurus-Lupus Association (UCL), which in turn is part of a huge collection of O and B stars called the Scorpius-Centaurus Association. From analysis of all its members, UCL lies at an average distance of 450 light-years, which fits well with Kakkab's individually measured distance.
Like many of its spectral type, Kakkab is a Beta Cephei star, a variable that pulsates subtly with multiple periods. With a major oscillation cycle of 0.259847 days (the period really is known to such accuracy), in which it varies by only 0.03 magnitudes (about 3%), Kakkab has one of the longest periods of its class. A secondary pulsation takes 0.236798 days. A 13th magnitude star, just 28" away, may be a genuine companion of Kakkab or may be simply an optical double.
Related category NOTABLE STARS
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