Tags: Star.
Alpha Ophiuchi (α Oph α Ophiuchi) is the brightest star in the constellation Ophiuchus. It has the traditional name Ras Alhague often condensed to Rasalhague.Alpha Ophiuchi is a binary star system with an orbital period of about 8.62 years. The orbital parameters were only poorly known until 2011 when observations using adaptive optics produced a better orbital fit allowing the individual masses of the two components to be determined.
