Star in the constellation Aquarius
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000      Equinox J2000
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
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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 1.2 × 1030 erg s−1.
References.
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