Alpha Herculis
Rasalgethi, (Arabic: رأس الجاثي ra‘is al-jāthī 'Head of the Kneeler'). also called as Alpha Herculis, is a red giant star. It is the brightest star in the Hercules constellation.
Alpha Herculis Media
A light curve for Alpha Herculis A, plotted from data published by Wasatonic (1997)