Omega2 Aquarii
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 Location of ω2 Aquarii (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aquarius |
| Right ascension | 23h 42m 43.34473s[1] |
| Declination | –14° 32′ 41.6523″[1] |
| Apparent magnitude (V) | 4.49[2] |
| Characteristics | |
| Spectral type | B9 V[3] |
| U−B color index | –0.12[2] |
| B−V color index | –0.04[2] |
| Astrometry | |
| Radial velocity (Rv) | +3[4] km/s |
| Proper motion (μ) | RA: +99.28[1] mas/yr Dec.: –66.32[1] mas/yr |
| Parallax (π) | 21.96 ± 0.26[1] mas |
| Distance | 149 ± 2 ly (45.5 ± 0.5 pc) |
| Details | |
| Radius | 1.94 ± 0.06[5] R☉ |
| Surface gravity (log g) | 4.22 ± 0.03[5] cgs |
| Temperature | 10,504 ± 91[5] K |
| Rotational velocity (v sin i) | 148[6] km/s |
| Other designations | |
Omega2 Aquarii (ω2 Aqr, ω2 Aquarii) is the Bayer designation for a triple star[8] system in the equatorial constellation of Aquarius. It can be seen with the naked eye, having an apparent visual magnitude of 4.49.[2] The approximate distance to this star, 149 light-years (46 parsecs), is known from parallax measurements taken during the Hipparcos mission.[1]
The primary component of this system is a massive, B-type main sequence star with a stellar classification of B9 V.[3] This star has nearly double the radius of the Sun[5] and is spinning rapidly with a projected rotational velocity of 148 km/s.[6] The outer atmosphere has an effective temperature of 10,504 K,[5] giving it the blue-white hue of a B-type star.[9]
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.[8] This system is among the 100 strongest stellar X-ray sources within 163 light-years (50 pc) of the Sun. It is emitting an X-ray luminosity of 1.2 × 1030 erg s−1.[10]
References
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