Omicron Herculis is a B9.5III star approximately 106 pc from the Earth. It has an apparent magnitude of 3.83. The star radiates with a bluish-white hue, and has a luminosity approximately 355 times as bright as the Sun. Omicron Herculis is 3.49 solar masses.
Stellar evolutionary caclulations show that it has just left the
main sequence. Omicron Herculis is an eruptive variable of the
Gamma Cassiopeiae class, which are rapidly rotating B-class stars with mass outflow. It has a
projected rotational velocity of 194 km/s. Some sources list Omicron Herculis as being both
spectroscopic and an
interferometric binary star with a separation of about 60 milliarcseconds, although the companion star has not been confirmed. Omicron Hercules is notable for residing close to the coordinates of the
solar apex, the direction towards which the Sun is moving. This was first noticed by
William Herschel in 1783, although in his first calculation he identified this point with
Lambda Herculis. It will eventually become the brightest star in the night sky in approximately 3.47 million years from today, at –0.63, slightly less bright than Canopus today. == References ==