2.12
Apparent Mag90
Distance (ly)B8V
Spectral Type13,000
Temperature (K)Beta Persei, also known as Algol, is the prototype eclipsing binary. Its dimming was known to ancient astronomers.
Stellar Data
Apparent Magnitude2.12
Absolute Magnitude-0.07
Distance90 light-years
Spectral TypeB8V
Temperature13,000 K
Luminosity98 L☉
Radius2.73 R☉
Mass3.17 M☉
Right Ascension03h 08m 10.1s
Declination+40° 57′ 20.3″
ConstellationPerseus
Notable Facts
- Algol dims every 2.87 days as its fainter companion eclipses it
- The name means the ghoul in Arabic
- The Algol paradox was key to understanding stellar evolution