Kappa2 Lupi

κ2 Lupi, Latinized as Kappa2 Lupi, is a white-hued star in the southern constellation of Lupus, and forms a double star with Kappa1 Lupi.[9] It is visible to the naked eye as a dim point of light with an apparent visual magnitude is 5.64. This star is located around 181 light years distant from the Sun. It is an A-type main-sequence star with a stellar classification of A3/5V.[3] However, Levato (1973) classed the star as A3IV, which would suggest it is already evolving off the main sequence.[4] The star has a high rotation rate, showing a projected rotational velocity of 160 km/s.[7]

For other stars with this Bayer designation, see κ Lupi.
Kappa2 Lupi
Observation data
Epoch J2000      Equinox J2000
Constellation Lupus
Right ascension 15h 11m 57.67549s[1]
Declination −48° 44′ 37.3397″[1]
Apparent magnitude (V) 5.70[2]
Characteristics
Spectral type A3/5V[3] or A3IV[4]
B−V color index +0.144±0.008[2]
Astrometry
Radial velocity (Rv)+0.0±3.7[5] km/s
Proper motion (μ) RA: −98.451[1] mas/yr
Dec.: −43.845[1] mas/yr
Parallax (π)18.0050 ± 0.1136 mas[1]
Distance181 ± 1 ly
(55.5 ± 0.4 pc)
Details
Metallicity [Fe/H]−0.01[6] dex
Rotational velocity (v sin i)160.4±1.0[7] km/s
Other designations
κ2 Lup, BD−48°9705, HD 134482, HIP 74380, HR 5647, SAO 225526[8]
Database references
SIMBADdata

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 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, S2CID 119257644.
  3. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. Levato, H. (January 1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics Supplement Series, 19: 91–99, Bibcode:1975A&AS...19...91L.
  5. Kharchenko, N. V.; et al. (2007), "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ˜55000 stars and mean radial velocities of 516 Galactic open clusters and associations", Astronomische Nachrichten, 328 (9): 889, arXiv:0705.0878, Bibcode:2007AN....328..889K, doi:10.1002/asna.200710776, S2CID 119323941.
  6. Netopil, Martin (August 2017), "Metallicity calibrations for dwarf stars and giants in the Geneva photometric system", Monthly Notices of the Royal Astronomical Society, 469 (3): 3042–3055, arXiv:1705.00883, Bibcode:2017MNRAS.469.3042N, doi:10.1093/mnras/stx1077, S2CID 119034918.
  7. Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386, S2CID 119286673.
  8. "kap02 lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-14.
  9. 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, S2CID 14878976.
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