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Basilicus, Kalb, Alpha Leonis, 32 Leonis

Proper NamesRegulus, Basilicus, Kalb
Bayer DesignationAlpha Leonis
Flamsteed Number32 Leonis
HR (BSC)3982
Right Ascension10h 9m 22s
Declination+11° 52' 31"
Distance79 light years
24 parsecs
MagnitudeApparent: +1.4
Absolute: -0.5
Spectral ClassB7V Blue Dwarf
Optimum VisibilityMarch
NotesRegulus is a complex star system with at least four members. The primary blue dwarf star Regulus A forms a close binary pair with a companion star, thought to be a white dwarf. Around Regulus A and its companion, a second binary pair orbits at a distance of some 5,000 AU.
Location of Regulus

Regulus lies almost exactly on the Ecliptic, the apparent path of the Sun through the sky. This means that, once each year, the Sun will appear to pass directly in front of the star, an event which happens on or about the 22 August.

Image of Regulus

A comet pursues its lonely course around Regulus, the 'Royal Star' of Leo.

This blue dwarf star is slightly variable, but is always bright from an Earth-bound observer's perspective, with an apparent magnitude varying around +1.3. Regulus is also notable for lying almost exactly on the line of the Ecliptic.


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