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Kappa Librae

April 12, 2024

Kappa Librae, Latinized from κ Librae, is the Bayer designation for a star system in the zodiac constellation of Libra. Its apparent visual magnitude is 4.72,[2] so it can be seen with the naked eye. The annual parallax shift of 10.57 mas[1] indicates it is roughly 310 light years away. It is positioned 0.02 degrees south of the ecliptic.

Kappa Librae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Libra
Right ascension 15h 41m 56.79858s[1]
Declination −19° 40′ 43.7745″[1]
Apparent magnitude (V) 4.72[2]
Characteristics
Spectral type K5 III[3]
U−B color index +1.94[2]
B−V color index +1.58[2]
Astrometry
Radial velocity (Rv)−4.5±1.5[4] km/s
Proper motion (μ) RA: −32.06[1] mas/yr
Dec.: −103.15[1] mas/yr
Parallax (π)10.57 ± 1.40 mas[1]
Distanceapprox. 310 ly
(approx. 90 pc)
Absolute magnitude (MV)−0.62[5]
Details
Radius38[6] R☉
Luminosity296[7] L☉
Temperature3,930[7] K
Other designations
κ Lib, 43 Lib, BD−19° 4188, FK5 1413, HD 139997, HIP 76880, HR 5838, SAO 159442[8]
Database references
SIMBADdata

The star shows acceleration components in its proper motion, indicating with high probability that it is an astrometric binary.[9] The visible component is an evolved K-type giant star with a stellar classification of K5 III.[3] It is a suspected variable star with a brightness that ranges between 4.70 and 4.75.[10] The measured angular diameter is 3.71±0.10 mas,[11] which, at the estimated distance of Kappa Librae, yields a physical size of about 38 times the radius of the Sun.[6] It radiates 296 times the solar luminosity from its outer atmosphere at an effective temperature of 3,930 K.[7]

In Chinese astronomy, Kappa Librae is called 日, Pinyin: Rì, meaning Sun, because this star is marking itself and stand alone in Sun asterism, Room mansion (see : Chinese constellation).[12]

References edit

  1. ^ a b c d e f 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, S2CID 18759600.
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. ^ a b Houk, Nancy; Smith-Moore, M. (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 4, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1988mcts.book.....H.
  4. ^ 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, S2CID 59451347, A61.
  5. ^ 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.
  6. ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
     
  7. ^ a b c McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  8. ^ "kap Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-01-30.{{cite web}}: CS1 maint: postscript (link)
  9. ^ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion" (PDF), The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590, from the original on September 24, 2017.
  10. ^ Samus, N. N.; Durlevich, O. V.; et al. (2004), "Combined General Catalogue of Variable Stars (GCVS4.2)", Vizier Online Data Catalog, Bibcode:2004yCat.2250....0S.
  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.
  12. ^ Ian Ridpath's Startales - Libra the Scales

April 12, 2024
kappa, librae, latinized, from, librae, bayer, designation, star, system, zodiac, constellation, libra, apparent, visual, magnitude, seen, with, naked, annual, parallax, shift, indicates, roughly, light, years, away, positioned, degrees, south, ecliptic, obser. Kappa Librae Latinized from k Librae is the Bayer designation for a star system in the zodiac constellation of Libra Its apparent visual magnitude is 4 72 2 so it can be seen with the naked eye The annual parallax shift of 10 57 mas 1 indicates it is roughly 310 light years away It is positioned 0 02 degrees south of the ecliptic Kappa Librae Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation LibraRight ascension 15h 41m 56 79858s 1 Declination 19 40 43 7745 1 Apparent magnitude V 4 72 2 CharacteristicsSpectral type K5 III 3 U B color index 1 94 2 B V color index 1 58 2 AstrometryRadial velocity Rv 4 5 1 5 4 km sProper motion m RA 32 06 1 mas yr Dec 103 15 1 mas yrParallax p 10 57 1 40 mas 1 Distanceapprox 310 ly approx 90 pc Absolute magnitude MV 0 62 5 DetailsRadius38 6 R Luminosity296 7 L Temperature3 930 7 KOther designationsk Lib 43 Lib BD 19 4188 FK5 1413 HD 139997 HIP 76880 HR 5838 SAO 159442 8 Database referencesSIMBADdataThe star shows acceleration components in its proper motion indicating with high probability that it is an astrometric binary 9 The visible component is an evolved K type giant star with a stellar classification of K5 III 3 It is a suspected variable star with a brightness that ranges between 4 70 and 4 75 10 The measured angular diameter is 3 71 0 10 mas 11 which at the estimated distance of Kappa Librae yields a physical size of about 38 times the radius of the Sun 6 It radiates 296 times the solar luminosity from its outer atmosphere at an effective temperature of 3 930 K 7 In Chinese astronomy Kappa Librae is called 日 Pinyin Ri meaning Sun because this star is marking itself and stand alone in Sun asterism Room mansion see Chinese constellation 12 References edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 a b c d Johnson H L et al 1966 UBVRIJKL photometry of the bright stars Communications of the Lunar and Planetary Laboratory 4 99 99 Bibcode 1966CoLPL 4 99J a b Houk Nancy Smith Moore M 1978 Michigan catalogue of two dimensional spectral types for the HD stars vol 4 Ann Arbor Dept of Astronomy University of Michigan Bibcode 1988mcts book H de Bruijne J H J Eilers A C October 2012 Radial velocities for the HIPPARCOS Gaia Hundred Thousand Proper Motion project Astronomy amp Astrophysics 546 14 arXiv 1208 3048 Bibcode 2012A amp A 546A 61D doi 10 1051 0004 6361 201219219 S2CID 59451347 A61 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 a b Lang Kenneth R 2006 Astrophysical formulae Astronomy and astrophysics library vol 1 3rd ed Birkhauser ISBN 3 540 29692 1 The radius R is given by 2 R 94 6 3 71 10 3 AU0 0046491 AU R 75 5 R displaystyle begin aligned 2 cdot R amp frac 94 6 cdot 3 71 cdot 10 3 text AU 0 0046491 text AU R bigodot amp approx 75 5 cdot R bigodot end aligned nbsp a b c McDonald I et al 2012 Fundamental Parameters and Infrared Excesses of Hipparcos Stars Monthly Notices of the Royal Astronomical Society 427 1 343 57 arXiv 1208 2037 Bibcode 2012MNRAS 427 343M doi 10 1111 j 1365 2966 2012 21873 x S2CID 118665352 kap Lib SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2017 01 30 a href Template Cite web html title Template Cite web cite web a CS1 maint postscript link Makarov V V Kaplan G H May 2005 Statistical Constraints for Astrometric Binaries with Nonlinear Motion PDF The Astronomical Journal 129 5 2420 2427 Bibcode 2005AJ 129 2420M doi 10 1086 429590 archived from the original on September 24 2017 Samus N N Durlevich O V et al 2004 Combined General Catalogue of Variable Stars GCVS4 2 Vizier Online Data Catalog Bibcode 2004yCat 2250 0S Richichi A et al February 2005 CHARM2 An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 2 773 777 Bibcode 2005A amp A 431 773R doi 10 1051 0004 6361 20042039 Ian Ridpath s Startales Libra the Scales Retrieved from https en wikipedia org w index php title Kappa Librae amp oldid 1183148055, wikipedia, wiki, book, books, library,

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