or β Persei, a variable fixed star of the second or third magnitude, called Medusa's Head. Its position, according to the catalogue of the London Astronomical Society, was, on January 1, 1830, R. A. 2 h. 57 m. 7.7 sec. An. Pr. + 3.9 sec.; N. Decl. 40° 17' 40.5"; An. Pr. + 14.3".