{{DISPLAYTITLE:Omega2 Aquarii}} Omega2 Aquarii, Latinised from ω2 Aquarii, is the Bayer designation for a triple star system in the equatorial constellation of Aquarius. It can be seen with the naked eye, having an apparent visual magnitude of 4.49. The approximate distance to this star, , is known from parallax measurements taken during the Hipparcos mission. The primary component of this system is a massive, B-type main-sequence star with a stellar classification of B9 V. This star has nearly double the radius of the Sun and is spinning rapidly with a projected rotational velocity of 148 km/s. The outer atmosphere has an effective temperature of , giving it the blue-white hue of a B-type star. There is a close orbiting stellar companion of unknown type, with a third component at an angular separation of 5.7 arcseconds. The latter is a K-type main-sequence star with a visual magnitude of 9.5. This system is among the 100 strongest stellar X-ray sources within of the Sun. It is emitting an X-ray luminosity of s−1. References External links Image Omega2 Aquarii 222661 Aquarii, Omega2 Aquarius (constellation) Aquarii, 105 B-type main-sequence stars 116971 8988 9836 BD-15 6476