| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Lupus |
| Right ascension | 15h38m 03.20372s[1] |
| Declination | −42° 34′ 02.4444″[1] |
| Apparent magnitude (V) | 4.33[2] (4.33 + 11.0)[3] |
| Characteristics | |
| Spectral type | K4.5 III[4] |
| U−B color index | +1.72[2] |
| B−V color index | +1.43[2] |
| Astrometry | |
| Radial velocity (Rv) | −6.8±2.7[5] km/s |
| Proper motion (μ) | RA: −21.37[1] mas/yr Dec.: −29.98[1] mas/yr |
| Parallax (π) | 8.97 ± 0.27 mas[1] |
| Distance | 360 ± 10 ly (111 ± 3 pc) |
| Absolute magnitude (MV) | +0.21[6] |
| Details | |
| Radius | 40[7] R☉ |
| Luminosity | 167[6] L☉ |
| Other designations | |
ω Lup, CD−42° 10601, FK5 3232, HD 139127, HIP 76552, HR 5797, SAO 226004.[8] | |
| Database references | |
| SIMBAD | data |
Omega Lupi, Latinised from ω Lupi, is a double star in the southern constellationofLupus. It is visible to the naked eye with an apparent visual magnitude of 4.33,[2] showing up as a red-hued star just to the south of Gamma Lupi.[9] Based upon an annual parallax shift of 8.97[1] mas as seen from Earth, it is located around 360 light-years from the Sun.
As of 2007, the components of this system had an angular separation of 11.4 arcseconds along a position angle of 29°,[10] and are most likely gravitationally bound as a wide binary star system.[3] The primary component is a magnitude 4.48 evolved giant star with a stellar classification of K4.5 III.[4] The measured angular diameter, after correction for limb darkening, is 3.39±0.04 mas.[11] At the estimated distance of Omega Lupi, this yields a physical size of about 40 times the radius of the Sun.[7] The companion is a magnitude 11.0 star.[3]
