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TOPIC: Algol


L

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RE: Algol
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Algol is at minimum brightness at 18:40 UT, 17th February, 2012.

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L

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Algol is at minimum brightness at 19:50 UT, 14th February, 2012.



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L

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Algol is at minimum brightness at 1:00 UT, 12th February, 2012



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L

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Algol at minimum brightness at 04:15 UT, 9th February, 2012



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L

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Algol is at minimum brightness at 7:30 UT, 6th Frebruary, 2012



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L

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Algol is at minimum brightness at 10:36 UT, 3rd February, 2012.

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L

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Minimum of Algol (Beta Perseus) variable star, at 21:47 UT, 31st January, 2012.

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L

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Minimum of Algol (Beta Perseus) variable star, at 00:58 UT, 29th January, 2012.



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L

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Minimum of Algol (Beta Perseus) variable star, at 04:09 UT, 26th January, 2012.

Algol (Beta Persei), known colloquially as the Demon Star, is a bright star in the constellation Perseus. It is one of the best known eclipsing binaries, the first such star to be discovered, and also one of the first (non-nova) variable stars to be discovered. Algol is actually a three-star system (Beta Persei A, B, and C) in which the large and bright primary Beta Persei A is regularly eclipsed by the dimmer Beta Persei B. Thus, Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every two days, 20 hours and 49 minutes during the roughly 10-hour long partial eclipses. There is also a secondary eclipse when the brighter star occults the fainter secondary. This secondary eclipse can only be detected photoelectrically. Algol gives its name to its class of eclipsing variable, known as Algol variables.



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L

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Minimum of Algol (Beta Perseus) variable star, at 07:20 UT, 23rd January, 2012



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