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A prominent constellation of the northern sky, representing the mythical Greek hero who rescued Andromeda. Its brightest star, Mirfak (Alpha Persei), is surrounded by a loose open star cluster, Melotte 20. Beta Persei is Algol, the prototype eclipsing binary. Rho Persei is a semiregular variable red giant that ranges between magnitudes 3.3 and 4.0 with a period of about 7 weeks. NGC 869 and 884 are the famous Double Cluster, also known as h and χ (Chi) Persei. M34 is a 5th-magnitude open cluster. M76 is a planetary nebula known as the Little Dumbbell. NGC 1499 is the California Nebula, and NGC 1275 is a peculiar galaxy known as the radio source Perseus A, part of the Perseus Cluster of galaxies. The year's brightest meteor shower, the Perseids, radiates from the constellation every August.

Subjects: Astronomy and Astrophysics.

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