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Regulus

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description Regulus Overview

Regulus, designated Alpha Leonis, is the brightest star in the northern celestial hemisphere constellation of Leo. It is a multiple-star system located roughly 79 light-years from Earth, with its primary component being a hot, blue-white main-sequence star. This primary star rotates at an exceptionally high velocity, causing it to bulge noticeably at its equator and take on a distinctly oblate shape. The system is often used by astronomers as a navigational reference and serves as a key subject in the study of stellar rotation dynamics.

help Regulus FAQ

Is Regulus one star or a multiple-star system?

Regulus appears as a single bright point to the unaided eye, but it belongs to a multiple-star system. Its main visible component has a close companion, while a more distant pair lies much farther away in the same system.

Why is Regulus flattened rather than spherical?

Regulus A rotates extremely rapidly, completing a turn in roughly 16 hours. That rotation produces a strong equatorial bulge and makes the star noticeably oblate.

Where can Regulus be found in the constellation Leo?

Regulus marks the heart of Leo and sits at the base of the backward question-mark pattern commonly called the Sickle. It is the constellation's brightest star and lies close to the ecliptic.

Can the Moon or planets pass in front of Regulus?

Yes, Regulus lies close enough to the ecliptic to undergo lunar occultations. Planets can also pass near it in the sky, making the star a useful landmark for observers following the zodiac.

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