Omega Lupi

Omega Lupi, Latinized 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.

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[1] mas
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

As of 2007, the components of this system had an angular separation of 11.4 arc seconds 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]

References
  1. van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  4. Landi Dessy, J.; Keenan, P. C. (November 1966), "Spectral Types on the MK System for Forty-Three Bright Southern Stars, K2-M6", Astrophysical Journal, 146: 587, Bibcode:1966ApJ...146..587L, doi:10.1086/148925.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  7. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
  8. "ome Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-10.
  9. Arnold, H.J.P; et al. (1999), The Photographic Atlas of the Stars, CRC Press, p. 176, ISBN 0750306548.
  10. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122: 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
  11. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
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