Kappa Librae

{{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

}}

{{Starbox character

| class = K5 III

| b-v = +1.58

| u-b = +1.94

| r-i =

| variable =

}}

{{Starbox astrometry

| radial_v = {{Val|−4.5|1.5}}

| prop_mo_ra = −32.06

| prop_mo_dec = −103.15

| parallax = 10.57

| p_error = 1.40

| parallax_footnote =

| absmag_v = −0.62

}}

{{Starbox detail

| source =

| mass = 1.6

| radius = 38

| luminosity = 388

| temperature = 3,875

| gravity = 1.35

| metal_fe = −0.39

| rotational_velocity =

| age_myr =

}}

{{Starbox catalog

| names = {{odlist | B=κ Lib | F=43 Lib | BD=−19°4188 | FK5=1413 | HD=139997 | HIP=76880 | HR=5838 | SAO=159442 }}

}}

{{Starbox reference

| Simbad = kap+Lib

}}

Kappa Librae is a star system in the zodiac constellation of Libra. Its name is a Bayer designation that is Latinized from {{nobr|κ Librae}}, and abbreviated {{nobr|Kappa Lib}} or {{nobr|κ Lib}}. Its apparent visual magnitude is 4.72, so it can be seen with the naked eye. The annual parallax shift of 10.57 mas indicates it is roughly 310 light years away. It is positioned 0.02 degrees south of the ecliptic.

The star shows acceleration components in its proper motion, indicating with high probability that it is an astrometric binary. The visible component is an evolved K-type giant star with a stellar classification of K5 III. It is a suspected variable star with a brightness that ranges between 4.70 and 4.75. Kappa Librae is 38 times larger than the Sun, and is radating 388 times the solar luminosity from its outer atmosphere at an effective temperature of {{val|fmt=commas|3,875|ul=K}}.

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).[http://www.ianridpath.com/startales/libra.htm#chinese Ian Ridpath's Startales - Libra the Scales]

References

{{reflist|2|refs=

{{citation

| title=Validation of the new Hipparcos reduction

| last1=van Leeuwen | first1=F.

| journal=Astronomy and Astrophysics

| volume=474 | issue=2 | pages=653–664 | date=2007

| arxiv=0708.1752 | bibcode=2007A&A...474..653V

| doi=10.1051/0004-6361:20078357 | s2cid=18759600 | postscript=. }}

{{citation |bibcode=2021Natur.594..505K |title=Past, present and future stars that can see Earth as a transiting exoplanet |last1=Kaltenegger |first1=L. |last2=Faherty |first2=J. K. |journal=Nature |date=2021 |volume=594 |issue=7864 |pages=505–507 |doi=10.1038/s41586-021-03596-y |pmid=34163055 |arxiv=2107.07936 }}

{{citation |last1=McDonald |first1=I. |last2=Zijlstra |first2=A. A. |last3=Watson |first3=R. A. |date=2017-10-01 |title=Fundamental parameters and infrared excesses of Tycho-Gaia stars |journal=Monthly Notices of the Royal Astronomical Society |volume=471 |pages=770–791 |doi=10.1093/mnras/stx1433 |doi-access=free |issn=0035-8711|arxiv=1706.02208 |bibcode=2017MNRAS.471..770M |postscript=.}} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/471/770&RAJ2000=235.486659 Kappa Librae's database entry] at VizieR.

{{citation

| last1=Samus | first1=N. N. | last2=Durlevich | first2=O. V.

| display-authors=etal | date=2004 | postscript=.

| title=Combined General Catalogue of Variable Stars (GCVS4.2)

| journal=Vizier Online Data Catalog | bibcode=2004yCat.2250....0S }}

{{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=https://apps.dtic.mil/sti/pdfs/ADA433654.pdf| archive-url=https://web.archive.org/web/20170924050424/http://www.dtic.mil/get-tr-doc/pdf?AD=ADA433654| url-status=live| archive-date=September 24, 2017| doi-access=free }}

{{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 | s2cid=59451347 | postscript=. }}

{{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