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词条 Kappa Librae
释义

  1. References

{{Starbox begin
| name = Kappa Librae
}}{{Starbox observe
| epoch = J2000.0
| equinox = J2000.0 (ICRS)
| constell = Libra
| ra = {{RA|15|41|56.79858}}
| dec = {{DEC|−19|40|43.7745}}
| appmag_v = 4.72[3]
}}{{Starbox character
| class = K5 III[4]
| b-v = +1.58[3]
| u-b = +1.94[3]
| r-i =
| variable =
}}{{Starbox astrometry
| radial_v = {{Val|−4.5|1.5}}[7]
| prop_mo_ra = −32.06
| prop_mo_dec = −103.15
| parallax = 10.57
| p_error = 1.40
| parallax_footnote =
| absmag_v = −0.62[11]
}}{{Starbox detail
| source =
| mass =
| radius = 38[12]
| luminosity = 296[13]
| temperature = 3,930[13]
| gravity =
| metal_fe =
| rotational_velocity =
| age_myr =
}}{{Starbox catalog
| names = κ Lib, 43 Lib, BD−19° 4188, FK5 1413, HD 139997, HIP 76880, HR 5838, SAO 159442.[15]
}}{{Starbox reference
| Simbad = kap+Lib
}}{{Starbox end}}

Kappa Librae, Latinized from κ Librae, is the Bayer designation for a star system in the zodiac constellation of Libra. With an apparent visual magnitude of 4.72,[3] it can be seen with the naked eye. It has an annual parallax shift of 10.57 mas, indicating it lies at a distance of roughly 310 light years.

The star shows acceleration components in its proper motion, indicating with high probability that it is an astrometric binary.[18] The visible component is an evolved K-type giant star with a stellar classification of K5 III.[4] It is a suspected variable star with a brightness that ranges between 4.70 and 4.75.[20] The measured angular diameter is {{Val|3.71|0.10|u=mas}},[21] which, at the estimated distance of Kappa Librae, yields a physical size of about 38 times the radius of the Sun.[12] It radiates 296 times the solar luminosity from its outer atmosphere at an effective temperature of 3,930 K.[13]

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).[1]

References

1. ^Ian Ridpath's Startales - Libra the Scales
2. ^1 {{citation | title=XHIP: An extended hipparcos compilation | last1=Anderson | first1=E. | last2=Francis | first2=Ch. | journal=Astronomy Letters | volume=38 | issue=5 | pages=331 | year=2012 | bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | arxiv=1108.4971 | postscript=. }}
3. ^1 {{citation | last=Samus | first=N. N. | last2=Durlevich | first2=O. V. | display-authors=etal | date=2004 | postscript=. | title=Combined General Catalogue of Variable Stars (GCVS4.2) | bibcode=2004yCat.2250....0S }}
4. ^1 {{citation | title=Statistical Constraints for Astrometric Binaries with Nonlinear Motion | last1=Makarov | first1=V. V. | last2=Kaplan | first2=G. H. | journal=The Astronomical Journal | postscript=. | volume=129 | issue=5 | pages=2420–2427 | date=May 2005 | doi=10.1086/429590 | bibcode=2005AJ....129.2420M | url=http://www.dtic.mil/get-tr-doc/pdf?AD=ADA433654}}
5. ^1 {{citation | display-authors=1 | last1=Richichi | first1=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | postscript=. | volume=431 | pages=773–777 | date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}
6. ^1 2 {{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3rd | publisher=Birkhäuser | date=2006 | isbn=3-540-29692-1 | url=https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41}}. The radius (R*) is given by::
7. ^1 2 3 {{citation | display-authors=1 | last1=McDonald | first1=I. | last2=Zijlstra | first2=A. A. | last3=Boyer | first3=M. L. | title=Fundamental Parameters and Infrared Excesses of Hipparcos Stars | journal=Monthly Notices of the Royal Astronomical Society | volume=427 | issue=1 | pages=343–57 | date=2012 | bibcode=2012MNRAS.427..343M | arxiv=1208.2037 | doi=10.1111/j.1365-2966.2012.21873.x | postscript=. }}
8. ^1 {{citation | last1=de Bruijne | first1=J. H. J. | last2=Eilers | first2=A.-C. | title=Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project | journal=Astronomy & Astrophysics | volume=546 | id=A61 | pages=14 | date=October 2012 | doi=10.1051/0004-6361/201219219 | bibcode=2012A&A...546A..61D | arxiv=1208.3048 | postscript=. }}
9. ^1 2 {{citation | last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M. | title=Michigan catalogue of two-dimensional spectral types for the HD stars | volume=4 | publication-place=Ann Arbor | year=1978 | publisher=Dept. of Astronomy, University of Michigan | bibcode=1988mcts.book.....H | postscript=. }}
10. ^1 2 3 4 {{citation | last1=Johnson | first1=H. L. | last2=Iriarte | first2=B. | last3=Mitchell | first3=R. I. | last4=Wisniewskj | first4=W. Z. | title=UBVRIJKL photometry of the bright stars | journal=Communications of the Lunar and Planetary Laboratory | volume=4 | issue=99 | year=1966 | display-authors=1 | bibcode=1966CoLPL...4...99J | postscript=. }}
11. ^1 {{cite simbad | title=kap Lib | accessdate=2017-01-30 | postscript=. }}
[2][3][4][5][6][7][8][9][10][11]
}}{{Stars of Libra|state=collapsed}}

10 : K-type giants|Suspected variables|Libra (constellation)|Bayer objects|Durchmusterung objects|Flamsteed objects|Henry Draper Catalogue objects|Hipparcos objects|HR objects|Astrometric binaries
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