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All Star Line Up: Algol - Windows to the Universe
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.

Related links:

Perseus

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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Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA