Beta Leporis

{{Short description|Second brightest star in the constellation Lepus}}

{{Starbox begin

| name = β Leporis

}}

{{Starbox image

| image=

{{Location mark

|image=Lepus constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=12|mark_link=β Leporis

|x=570|y=590

}}

|caption=Location of β Leporis (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Lepus

| ra = {{RA|05|28|14.72316}}

| dec = {{DEC|−20|45|33.9878}}

| appmag_v = 2.84

}}

{{Starbox character

| class = G5 II

| u-b = +0.47

| b-v = +0.82

| r-i = +0.44

}}

{{Starbox astrometry

| radial_v = {{nowrap|−13.6 ± 0.9}}

| prop_mo_ra = −5.02

| prop_mo_dec = −85.92

| parallax = 20.34

| p_error = 0.18

| parallax_footnote =

| absmag_v = −0.65

}}

{{Starbox detail

| mass = {{nowrap|3.5 ± 0.1}}

| radius = {{Solar radius calculator|type=AD|3.003|0.0492|decimals=1}}

| temperature = {{val|5434|38|fmt=commas}}

| gravity = {{nowrap|2.60 ± 0.03}}

| metal_fe = {{val|-0.12|0.06}}

| luminosity = {{val|160|3}}

| rotational_velocity = 11

| age_myr = 240

}}

{{Starbox catalog

| names = Nihal, β Lep, Beta Leporis, Beta Lep, 9 Leporis, 9 Lep, BD−20 1096, FK5 204, GC 6762, HD 36079, HIP 25606, HR 1829, PPM 248938, SAO 170457, WDS 05282-2046A.

}}

{{Starbox reference

| Simbad=beta+lep

}}

Beta Leporis (β Leporis, abbreviated Beta Lep, β Lep), formally named Nihal {{IPAc-en|'|n|ai|.|æ|l}},{{cite book

|last1=Kunitzsch |first1=Paul

|last2=Smart |first2=Tim

|date = 2006 |edition = 2nd rev.

|title = A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations

|publisher = Sky Pub |location = Cambridge, Massachusetts

|isbn = 978-1-931559-44-7

}}{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt | title=IAU Catalog of Star Names |access-date=28 July 2016}} is the second brightest star in the constellation of Lepus.

Nomenclature

Beta Leporis is the star's Bayer designation. It is also known by the traditional named Nihal, Arabic for "quenching their thirst". The occasional spelling Nibal appears to be due to a misreading. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN){{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=22 May 2016}} to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016{{cite web | url=http://www.pas.rochester.edu/~emamajek/WGSN/WGSN_bulletin1.pdf | title=Bulletin of the IAU Working Group on Star Names, No. 1 |access-date=28 July 2016}} included a table of the first two batches of names approved by the WGSN; which included Nihal for this star.

In Chinese, {{lang|zh|廁}} ({{lang|zh-Latn|Cè}}), meaning Toilet, refers to an asterism consisting of β Leporis, α Leporis, γ Leporis and δ Leporis.{{in lang|zh}} 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, {{ISBN|978-986-7332-25-7}}. Consequently, the Chinese name for β Leporis itself is {{lang|zh|廁二}} ({{lang|zh-Latn|Cè èr}}), "the Second Star of Toilet".{{in lang|zh}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm 香港太空館 - 研究資源 - 亮星中英對照表] {{webarchive|url=https://web.archive.org/web/20081025110153/http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_ala_alz.htm |date=2008-10-25 }}, Hong Kong Space Museum. Accessed on line November 23, 2010.

Properties

Based on parallax measurements from the Hipparcos astrometry satellite, this star is located about {{Convert|160|ly|pc|abbr=off|lk=on}} from the Earth. It has an apparent visual magnitude of 2.84 and a stellar classification of G5 II. The mass of this star is 3.5 times the mass of the Sun and it is about 240 million years old, which is the sufficient time for a star this massive to consume the hydrogen at its core and evolve away from the main sequence, becoming a G-type bright giant. The angular diameter of Beta Leporis, after correction for limb darkening, is {{val|3.003|0.066|ul=mas}}. At the distance to this star, it yield a physical radius of 15.9 times the radius of the Sun.

This is a double star system and may be a binary, whereby the second star has a brightness of 7.34 mag.{{Cite web |title=Nihal - β Leporis (beta Leporis) - Star in Lepus {{!}} TheSkyLive.com |url=https://theskylive.com/sky/stars/nihal-beta-leporis-star |access-date=2023-03-28 |website=theskylive.com}} Using adaptive optics on the AEOS telescope at Haleakala Observatory, the pair was found to be separated by an angle of 2.58 arcseconds at a position angle of 1.4°. Component B has been observed to fluctuate in brightness and is catalogued as suspected variable star NSV 2008.

References

{{reflist|30em|refs=

{{cite journal | title=Validation of the new Hipparcos reduction | last=van Leeuwen | first=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 |date=November 2007 | pages=653–664 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V |arxiv = 0708.1752 | s2cid=18759600 }}

{{citation

| title=XHIP: An extended hipparcos compilation

| last1=Anderson | first1=E. | last2=Francis | first2=Ch.

| journal=Astronomy Letters

| volume=38 | issue=5 | page=331 | year=2012

| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015

| arxiv=1108.4971 | s2cid=119257644 | postscript=. }}

{{Cite journal |last1=da Silva |first1=Ronaldo |last2=Milone |first2=André de C. |last3=Rocha-Pinto |first3=Helio J. |date=2015-08-01 |title=Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets |bibcode=2015A&A...580A..24D |journal=Astronomy and Astrophysics |volume=580 |pages=A24 |doi=10.1051/0004-6361/201525770 |issn=0004-6361|arxiv=1505.01726 }} [https://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/A%2BA/580/A24&Name=HD36079 Beta Leporis' database entry] at VizieR.

{{citation | last1=Evans | first1=D. S. | contribution=The Revision of the General Catalogue of Radial Velocities | title= Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 held at the University of Toronto 20-24 June, 1966 | volume=30 | editor1-first=Alan Henry | editor1-last=Batten | editor2-first=John Frederick | editor2-last=Heard | publisher=Academic Press, London | page=57 | bibcode=1967IAUS...30...57E | year=1967 }}

{{cite journal | author=Bernacca, P. L. | author2=Perinotto, M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | page=1 | date=1970 | bibcode=1970CoAsi.239....1B }}

{{cite journal | display-authors=1 | 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 | page=99 | date=1966 | bibcode=1966CoLPL...4...99J }}

{{citation | last=Perryman | first=Michael | title=The Making of History's Greatest Star Map | location=Heidelberg | publisher=Springer-Verlag | date=2010 | doi=10.1007/978-3-642-11602-5| series=Astronomers' Universe | isbn=978-3-642-11601-8 | url=https://cds.cern.ch/record/1338896 | bibcode=2010mhgs.book.....P | url-access=subscription }}

{{citation | last1=Roberts | first1=Lewis C. Jr. | title=Astrometric and photometric measurements of binary stars with adaptive optics: observations from 2002 | journal=Monthly Notices of the Royal Astronomical Society | volume=413 | issue=2 | pages= 1200–1205 |date=May 2011 | doi=10.1111/j.1365-2966.2011.18205.x | doi-access=free | bibcode=2011MNRAS.413.1200R |arxiv = 1012.3383 | s2cid=118398949 }}

{{citation | display-authors=1 | last1=Lyubimkov | first1=Leonid S. | last2=Lambert | first2=David L. | last3=Rostopchin | first3=Sergey I. | last4=Rachkovskaya | first4=Tamara M. | last5=Poklad | first5=Dmitry B. | title=Accurate fundamental parameters for A-, F- and G-type Supergiants in the solar neighbourhood | journal=Monthly Notices of the Royal Astronomical Society | volume=402 | issue=2 | pages=1369–1379 |date=February 2010 | doi=10.1111/j.1365-2966.2009.15979.x | doi-access=free | bibcode=2010MNRAS.402.1369L |arxiv = 0911.1335 | s2cid=119096173 }}

{{citation | title=CCDM J05283-2046AB -- Double or multiple star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Beta+Leporis | access-date=2011-12-27 }}

{{citation | title=NSV 2008, database entry | work=New Catalogue of Suspected Variable Stars, the improved version | publisher=Sternberg Astronomical Institute | location=Moscow, Russia. | url=http://www.sai.msu.su/groups/cluster/gcvs/gcvs/nsv/nsv.dat | access-date=2008-11-18 }}

[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=1829 HR 1829], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 18, 2008.

{{Cite journal |last1=Richichi |first1=A. |last2=Percheron |first2=I. |last3=Davis |first3=J. |date=2009-10-01 |title=A list of bright interferometric calibrators measured at the European Southern Observatory Very Large Telescope Interferometer |bibcode=2009MNRAS.399..399R |journal=Monthly Notices of the Royal Astronomical Society |volume=399 |issue=1 |pages=399–409 |doi=10.1111/j.1365-2966.2009.15289.x |doi-access=free |arxiv=0906.3981 |issn=0035-8711}}

{{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:

: $\begin{align} 2\cdot R_*
& = \frac{(10^{-3}\cdot 49.2\cdot 3.003)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
& \approx 31.78\cdot R_{\bigodot}
\end{align}$

{{citation

| pages=265, 269 | url=https://books.google.com/books?id=5xQuAAAAIAAJ | title=Star-names and Their Meanings | first1=Richard Hinckley | last1=Allen | location=New York | publisher=G. E. Steichert | date=1899 }}

{{citation | url=http://www.astro.uiuc.edu/~kaler/sow/nihal.html | title=Nihal | work=Stars | first1=James B. | last1=Kaler | access-date=2008-11-18 | archive-url=https://web.archive.org/web/20081210154831/http://www.astro.uiuc.edu/~kaler/sow/nihal.html | archive-date=2008-12-10 }}

}}

Nihal

Category:Lepus (constellation)

Category:G-type bright giants