Omega Lupi

Omega Lupi
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Lupus
Right ascension 15h 38m 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]
Distance360 ± 10 ly
(111 ± 3 pc)
Absolute magnitude (MV)+0.21[6]
Details
Radius40[7] R☉
Luminosity167[6] L☉
Other designations
ω Lup, CD−42° 10601, FK5 3232, HD 139127, HIP 76552, HR 5797, SAO 226004.[8]
Database references
SIMBADdata

Omega Lupi, Latinised from ω Lupi, is a double star in the southern constellation of Lupus. 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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference LandiDessy1966 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference lang2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Arnold1999 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Mason2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Richichi2005 was invoked but never defined (see the help page).