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Warnings: The True Story of How Science Tamed the Weather by Mike Smith tells the story of our storm warning system. See our online store book collection.
Algol is actually two stars. Star A is separated from close companion B by less than one tenth of the Earth-Sun distance, and partially eclipses every 2.9 days.
Click on image for star map
Jens Dengler, reproduced with permission.

Algol

What's in a Name: Arabic for "head of the demon"
Claim to Fame: Represents Medusa's eye in Perseus. A special variable
star that "winks" every 3 days.
Type of Star: Blue-white Main Sequence Star, and a yellow Subgiant
How Far Away: 105 light years away
How Bright: Almost 100,000 times brighter than the Sun!
Where to View: In the constellation Perseus the Hero
When to View:November through March

Last modified March 1, 2005 by Travis Metcalfe.

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The Summer 2010 issue of The Earth Scientist, available in our online store, includes articles on rivers and snow, classroom planetariums, satellites and oceanography, hands-on astronomy, and global warming.

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Algol

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