Omicron Herculis
Omicron Herculis, Latinized from o Herculis, is a multiple star system in the constellation Hercules. It used to be called Masym, but this name was transferred to Lambda Herculis.Properties
Omicron Herculis is a B9.5V 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.
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.
Omicron Herculis is both a spectroscopic and an interferometric binary star with a separation of 0.1 arcsec.
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 sky in approximately 3 million years from today, at -0.4, slightly less bright than Canopus today.
