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consisting of Beta Persei Aa1, Aa2, and Ab - in which the hot luminous primary ? Persei Aa1 and the larger, but cooler and fainter, ? Persei Aa2 regularly pass in front of each other, causing eclipses. Thus Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every 2.86 days during the roughly 10-hour-long partial eclipses. The secondary eclipse when the brighter primary star occults the fainter secondary is very shallow

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