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TOPIC: Algol


L

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



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Minimum of Algol (Beta Perseus) variable star, at 10:31 UT, 20th January, 2012



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Minimum of Algol (Beta Perseus) variable star, at 13:42 UT, 17th January, 2012



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Minimum of Algol (Beta Perseus) variable star, at 16:53 UT, 14th January, 2012



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Minimum of Algol (Beta Perseus) variable star, at 20:00 UT, 11th January, 2012



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L

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Beta Perseus
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Minimum of Beta Perseus variable star, 1:50 GMT, 5th March, 2011.

Magnitude=3.4mag  
Max=2.1mag  
Period= 2.9days   
RA= 3h08.2m  Dec=+40°57'

Eclipse begins at about 21:00 and ends at 6:38 GMT.

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L

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RE: Algol
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Minimum of Beta Perseus variable star, 3:10 GMT, 10th February, 2011.

Magnitude=3.4mag  
Max=2.1mag  
Period= 2.9days   
RA= 3h08.2m  Dec=+40°57'

Eclipse begins at about 22:25 and ends at 8:03 GMT.

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L

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Minimum of Beta Perseus variable star, 9:35 GMT, 4th February, 2011.

Magnitude=3.4mag  
Max=2.1mag  
Period= 2.9days   
RA= 3h08.2m  Dec=+40°57'

Eclipse begins at about 4:46 and ends at 14:25 GMT.

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