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| {{Starbox begin
| | Hello. Allow me introduce the writer. Her title is Emilia Shroyer but it's not the most feminine name out there. Minnesota has always been his house but his wife wants them to transfer. Managing individuals has been his working day job for a while. Body building is 1 of the issues I adore most.<br><br>My web blog ... [http://fankut.com/index.php?do=/profile-2572/info/ at home std test] |
| | name=Alpha Serpentis
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| }}
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| {{Starbox image
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| | image =
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| <div style="position: relative">[[File:Serpens_Caput_IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Serpens constellation and its surroundings]]
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| <div style="position: absolute; left: 45.2%; top: 50.6%">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption=Location of α Serpentis (circled)
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| }}
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| {{Starbox observe
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| | epoch = J2000
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| | ra = {{RA|15|44|16.07431}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|+06|25|32.2633}}<ref name=aaa474_2_653/>
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| | appmag_v = 2.623<ref name=sps1966/>
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| | constell = [[Serpens]]
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| }}
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| {{Starbox character
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| | class = K2 III
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| | b-v = +1.167<ref name=sps1966/>
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| | u-b = +1.248<ref name=sps1966/>
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| | variable =
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| }}
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| {{Starbox astrometry
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| | radial_v = +2.63<ref name=aaa430_165/>
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| | prop_mo_ra = +133.84<ref name=aaa474_2_653/>
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| | prop_mo_dec = +44.81<ref name=aaa474_2_653/>
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| | parallax = 44.10
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| | p_error = 0.19
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| | parallax_footnote = <ref name=aaa474_2_653/>
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| | absmag_v = {{nowrap|+0.88 ± 0.03}}<ref name=aj135_3_892/>
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| }}
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| {{Starbox detail
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| | mass =
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| | radius = 12<ref name=lang2006/>
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| | luminosity = 70<ref name=kaler/>
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| | temperature = 4,498<ref name=aj135_1_209/>
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| | gravity = 2.5<ref name=aj135_1_209/>
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| | metal_fe = 0.03<ref name=aj135_1_209/>
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| | rotational_velocity = 4.3<ref name=aj135_1_209/>
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| | age_myr =
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| }}
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| {{Starbox catalog
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| | names = Unukalhai, Cor Serpentis, 24 Serpentis, [[Star catalogue#BS, BSC, HR|HR]] 5854, [[Henry Draper Catalogue|HD]] 140573, [[Star catalogue#SAO|SAO]] 121157, [[Hipparcos|HIP]] 77070, [[Star catalogue#ADS|ADS]] 9765, CCDM 15442+0626.<ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''Alpha Serpentis''' (α Serpentis, α Ser) is a [[double star]] in the head (Serpens Caput) of the equatorial [[constellation]] [[Serpens]]. It has the traditional name '''Unukalhai'''. With an [[apparent visual magnitude]] of 2.6,<ref name=sps1966/> this star is the brightest in the constellation and it can be viewed with the naked eye from most of the [[Earth]]. [[Parallax]] measurements yield an estimated distance of about {{Convert|74|ly|pc|abbr=off|lk=on}} from [[Earth]].
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| ==Properties==
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| Alpha Serpentis is a [[giant star]] with a [[stellar classification]] of K2 III, having consumed the hydrogen at its core and [[stellar evolution|evolved]] away from the [[main sequence]]. The [[interferometry]]-measured [[angular diameter]] of this star, after correcting for [[limb darkening]], is {{nowrap|4.85 ± 0.05 [[milliarcseconds|mas]]}},<ref name=aaa431_773/> which, at its estimated distance, equates to a physical radius of about 12 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> The [[effective temperature]] of the outer envelope is 4,498 K,<ref name=aj135_1_209/> giving it an orange hue that is characteristic of a K-type star.<ref name=csiro/>
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| This star is radiating about 38 times the [[solar luminosity|luminosity of the Sun]], while a further 32 times the Sun's luminosity is being emitted in the [[infrared]], for 70-fold total.<ref name=kaler/> A magnitude +11.8 companion is at an [[angular separation]] of 58 [[arcsecond]]s from Alpha Serpentis, while a 13th magnitude star lies 2.3 [[arcminute]]s distant.
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| ==Etymology==
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| Alpha Serpentis has the proper names '''Unukalhai''',<ref>Also spelt '''Unuk al Hay''' or '''Unuk Elhaija'''.</ref> from the [[Arabic language|Arabic]] عنق الحية ''‘Unuq al-Ħayyah'' "[[Serpens|the Serpent]]'s Neck", and '''Cor Serpentis''' from the [[Latin]] "the Heart of the Serpent". It was a member of indigenous Arabic [[Asterism (astronomy)|asterism]] '''al-Nasaq al-Yamānī''', "the Southern Line" of ''al-Nasaqān'' "the Two Lines".,<ref name=kunitzsch_smart2006/> along with [[Delta Serpentis|δ Ser]] (Qin, Tsin), [[Epsilon Serpentis|ε Ser]] (Ba, Pa), [[Delta Ophiuchi|δ Oph]] (Yed Prior), [[Epsilon Ophiuchi|ε Oph]] (Yed Posterior), [[Zeta Ophiuchi|ζ Oph]] (Han) and [[Gamma Ophiuchi|γ Oph]] (Tsung Ching).<ref name=allen1963/>
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| According to the catalogue of stars in the ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars'', ''al-Nasaq al-Yamānī'' or '''Nasak Yamani''' were the title for two stars :[[Delta Serpentis|δ Ser]] as ''Nasak Yamani I'' and [[Epsilon Serpentis|ε Ser]] as ''Nasak Yamani II'' (exclude this star, [[Delta Ophiuchi|δ Oph]], [[Epsilon Ophiuchi|ε Oph]], [[Zeta Ophiuchi|ζ Oph]] and [[Gamma Ophiuchi|γ Oph]])<ref>[http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720005197_1972005197.pdf Jack W. Rhoads - ''Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars'', Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971]</ref>
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| In [[Chinese language|Chinese]], {{lang|zh|天市右垣}} ({{lang|zh-Latn|Tiān Shì Yòu Yuán}}), meaning ''[[Heavenly Market enclosure|Right Wall of Heavenly Market Enclosure]]'', refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of α Serpentis, [[Beta Herculis|β Herculis]], [[Gamma Herculis|γ Herculis]], [[Kappa Herculis|κ Herculis]], [[Gamma Serpentis|γ Serpentis]], [[Beta Serpentis|β Serpentis]], [[Delta Serpentis|δ Serpentis]], [[Epsilon Serpentis|ε Serpentis]], [[Delta Ophiuchi|δ Ophiuchi]], [[Epsilon Ophiuchi|ε Ophiuchi]] and [[Zeta Ophiuchi|ζ Ophiuchi]].<ref>{{zh icon}} ''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.</ref> Consequently, α Serpentis itself is known as {{lang|zh|天市右垣七}} ({{lang|zh-Latn|Tiān Shì Yòu Yuán qī}}, {{lang-en|the Seventh Star of Right Wall of Heavenly Market Enclosure}}), represent the state '''[[Shu (state)|Shu]]''' (蜀) (or '''Shuh''')<ref>{{zh icon}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/c_research_chinengstars_t_z.htm 香港太空館 - 研究資源 - 亮星中英對照表], Hong Kong Space Museum. Accessed on line November 23, 2010.</ref><ref>{{zh icon}} [http://www.lcsd.gov.hk/CE/Museum/Space/Research/StarName/e_research_chinengstarzone_b.htm#HeavenlyMarketEnclosure English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name], Hong Kong Space Museum. Accessed on line November 23, 2010.</ref>(together with [[Lambda Serpentis|λ Ser]] in R.H.Allen's works).<ref name=allen1963/>
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| ==References==
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| {{Reflist|30em|refs=
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| <ref name=aaa474_2_653>{{citation | first=F. | last=van Leeuwen |date=November 2007 | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 |arxiv = 0708.1752 }}</ref>
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| <ref name=aj135_1_209>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M }}</ref>
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| <ref name=aaa430_165>{{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | last6=Dejonghe | first6=H. | last7=Turon | first7=C. | title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters | journal=Astronomy and Astrophysics | volume=430 | issue=1 | pages=165–186 |date=January 2005 | doi=10.1051/0004-6361:20041272 | bibcode=2005A&A...430..165F |arxiv = astro-ph/0409579 }}</ref>
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| <ref name=aj135_1_209>{{citation | display-authors=1 | last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W. | last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey | title=Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity | journal=The Astronomical Journal | volume=135 | issue=1 | pages=209–231 |date=January 2008 | doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M }}</ref> | |
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| <ref name=sps1966>{{citation | display-authors=1 | last1=Gutierrez-Moreno | first1=Adelina | last2=Moreno | first2=H. | last3=Stock | first3=J. | last4=Torres | first4=C. | last5=Wroblewski | first5=H. | title=A System of photometric standards | publisher=Publicaciones Universidad de Chile, Department de Astronomy | volume=1 | pages=1–17 | year=1966 | bibcode=1966PDAUC...1....1G }}</ref>
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| <ref name=SIMBAD>{{citation | title=UNUKALHAI -- Star in double system | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Beta+Pyx | accessdate=2012-01-11 }}</ref>
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| <ref name=aaa431_773>{{citation | last1=Richichi | pages=A. | last2=Percheron | first2=I. | last3=Khristoforova | first3=M. | title=CHARM2: An updated Catalog of High Angular Resolution Measurements | journal=Astronomy and Astrophysics | volume=431 | pages=773–777 |date=February 2005 | doi=10.1051/0004-6361:20042039 | bibcode=2005A&A...431..773R }}</ref>
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| <ref name=lang2006>{{citation | first1=Kenneth R. | last1=Lang | title=Astrophysical formulae | volume=1 | series=Astronomy and astrophysics library | edition=3 | publisher=Birkhäuser | year=2006 | isbn=3-540-29692-1 | url=http://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 }}. The radius (R<sub>*</sub>) is given by:
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| :<math>\begin{align} 2\cdot R_*
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| & = \frac{(10^{-3}\cdot 22.7\cdot 4.85)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 23.7\cdot R_{\bigodot}
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| \end{align}</math></ref>
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| <ref name=kaler>{{citation | first1=James B. | last1=Kaler | title=UNUKALHAI (Alpha Serpentis) | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/unukalhai.html | accessdate=2012-01-11 }}</ref>
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| <ref name=kunitzsch_smart2006>{{citation | last1=Kunitzsch | first1=P. | last2=Smart | first2=T., | year=2006 | title=A Dictionary of Modern Star names: A Short Guide to 254 Star names and Their Derivations | edition=Second Revised | publisher=Sky Publishing | location=Cambridge, MA | isbn=1-931559-44-9 | page=31 }}</ref>
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| <ref name=allen1963>{{citation | last=Allen | first=R. H. | year=1963 | authorlink=Richard Hinckley Allen | title=Star Names: Their Lore and Meaning | url=http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Hercules*.html | accessdate=2010-12-12 | edition=Reprint | publisher=Dover Publications Inc | location=New York, NY | isbn=0-486-21079-0 | page=243 }}</ref>
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| <ref name=csiro>{{citation | title=The Colour of Stars | date=December 21, 2004 | work=Australia Telescope, Outreach and Education | publisher=Commonwealth Scientific and Industrial Research Organisation | url=http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html | accessdate=2012-01-16 }}</ref>
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| <ref name=aj135_3_892>{{citation | display-authors=1 | last1=Carney | first1=Bruce W. | last2=Gray | first2=David F. | last3=Yong | first3=David | last4=Latham | first4=David W. | last5=Manset | first5=Nadine | last6=Zelman | first6=Rachel | last7=Laird | first7=John B. | title=Rotation and Macroturbulence in Metal-Poor Field Red Giant and Red Horizontal Branch Stars | journal=The Astronomical Journal | volume=135 | issue=3 | pages=892–906 |date=March 2008 | doi=10.1088/0004-6256/135/3/892 | bibcode=2008AJ....135..892C |arxiv = 0711.4984 }}</ref>
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| {{Stars of Serpens}}
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| [[Category:Bayer objects|Serpentis, Alpha]]
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| [[Category:Serpens (constellation)]]
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| [[Category:Triple star systems]]
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| [[Category:K-type giants]]
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| [[Category:Stars with proper names]]
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Hello. Allow me introduce the writer. Her title is Emilia Shroyer but it's not the most feminine name out there. Minnesota has always been his house but his wife wants them to transfer. Managing individuals has been his working day job for a while. Body building is 1 of the issues I adore most.
My web blog ... at home std test