The position of Beta Persei (Algol; Gorgona; Gorgonea Prima; Demon Star; El Ghoul) Tags: Algol View |
Algol (? Per / Beta (beta (letter)) Persei), known colloquially as the Demon Star, is a bright star in the constellation Perseus (Perseus (constellation)). It is one of the best known eclipsing binaries (eclipsing binary), 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, Algols magnitude (apparent 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.
Epoch: J2000
Ra: RA030810.1315
Dec: DEC +405720.332
Appmag V: 2.12
Constell: Perseus (Perseus (constellation)) Starbox character
Class: B8V (A) /K02IV (B) /A5V (C)
B-v: -0.05
U-b: -0.37
Variable: Eclipsing binary Starbox astrometry
Radial V: 3.7
Prop Mo Ra: 2.39
Prop Mo Dec: -1.44
Parallax: 35.14
P Error: 0.90
Absmag V: -0.15 Starbox detail
Mass: 3.59/0.79/1.67
Radius: 2.3/3.0/0.9
Luminosity: 98/3.4/4.1
Temperature: 12,000/4,500/8,500
Metal: ''Not available''
Rotation: 65 km/s.
Age: 8 Starbox catalog
Names: Algol, Gorgona, Gorgonea Prima, Demon Star, El Ghoul, 26 Per, GJ (Gliese-Jahreiss catalogue) 9110, HR (Harvard Revised catalogue) 936, BD (Bonner Durchmusterung) +40�673, HD (Henry Draper catalogue) 19356, GCTP (General Catalogue of Trigonometric Parallaxes) 646.00, SAO (Smithsonian Astrophysical Observatory Star Catalog) 38592, FK5 111, Wo 9110, ADS 2362, WDS 03082+4057A, HIP (Hipparcos catalogue) 14576. Starbox end