Mirfak (also known as Algenib, and designated α Persei) is the brightest star in the constellation of Perseus. It is a yellow supergiant star, about 5,000 times as luminous as the sun, and lying at a distance of about 580 light years.
In the Hertzsprung-Russell Diagram, Mirfak lies very close to the region in which Cepheid variables are found. It is thus useful in the study of these stars, which are extremely important standard candles.
Pozicija R.A. Ova zvezda je nekim atlasima i mapama obelezena i kao "Algenib", isto kao i Gamma Pegasi i AlphaPersei.
Među najsjajnijim članovima grupe su i Omicron Persei, Xi Persei, 40 i 42 Persei, dvostruka zvezda Sigma 448 i oko 15 drugih članova čija je magnituda preko 6-te magnitude.
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