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| {{Starbox begin
| | Friends contact her Felicidad and her husband doesn't like it at all. The thing she adores most is to play handball but she can't make it her profession. Years in the past we moved to Arizona but my wife wants us to transfer. Bookkeeping has been his working day job for a while.<br><br>my web blog: [http://Facegospel.noalvo.org/index.php?do=/profile-380/info/ http://Facegospel.noalvo.org/] |
| | name=12 Ophiuchi
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| }}
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| {{Starbox observe
| |
| | epoch=J2000
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| | ra={{RA|16|36|21.44979}}<ref name=aaa474_2_653/>
| |
| | dec={{DEC|–02|19|28.5195}}<ref name=aaa474_2_653/>
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| | appmag_v=5.77<ref name=mnras384_1_173/>
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| | constell=[[Ophiuchus]]
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| }}
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| {{Starbox character
| |
| | class=K2 V
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| | b-v=+.82
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| | u-b=+0.50
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| | variable=[[BY Draconis variable|BY Draconis]]
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| }}
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| {{Starbox astrometry
| |
| | radial_v=–15.4
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| | prop_mo_ra=+456.04<ref name=aaa474_2_653/>
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| | prop_mo_dec=–309.63<ref name=aaa474_2_653/>
| |
| | parallax=102.55
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| | p_error=0.40
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| | parallax_footnote=<ref name=aaa474_2_653/>
| |
| | absmag_v={{nowrap|5.57 ± 0.05}}<ref name=mnras384_1_173/>
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| }}
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| {{Starbox detail
| |
| | mass=0.91<ref name=mnras384_1_173/>
| |
| | radius={{nowrap|0.84 ± 0.03}}<ref name=mnras384_1_173/>
| |
| | luminosity=0.39
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| | luminosity_bolometric=0.45
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| | gravity={{nowrap|4.59 ± 0.10}}<ref name=mnras384_1_173/>
| |
| | temperature=5,300<ref name="flynn_morel"/>
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| | metal_fe={{nowrap|+0.04 ± 0.07}}<ref name=mnras384_1_173/>
| |
| | metal=102% Sun<ref name="flynn_morel" />
| |
| | rotation=21.3 days<ref name=apj510_2_L135/>
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| | rotational_velocity={{nowrap|2.4 ± 1.0}}<ref name=mnras384_1_173/>
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| | age_gyr=1.0–1.9<ref name="apj687"/>
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| }}
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| {{Starbox catalog
| |
| | names=[[Flamsteed designation|12 Oph]], [[Bonner Durchmusterung|BD]]-01 3220, [[Fifth Fundamental Catalogue|FK5]] 1433, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 3773.00, [[Gliese-Jahreiss catalogue|GJ]] 631, [[Henry Draper catalogue|HD]] 149661, [[Hipparcos catalogue|HIP]] 81300, [[Harvard Revised catalogue|HR]] 6171, [[Luyten Half-Second catalogue|LHS]] 3224, [[Luyten Two-Tenths catalogue|LTT]] 6632, [[Variable star designation|V]]2133 Oph, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 141269.
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| }}
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| {{Starbox reference
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| | Simbad=HD+149661
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| | ARICNS=01317
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| }}
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| {{Starbox end}}
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| | |
| '''12 Ophiuchi''' is a [[variable star]] in the [[constellation]] [[Ophiuchus]]. No companions have yet been detected in orbit around this star, and it remains uncertain whether or not it possesses a dust ring.<ref>{{cite journal | author=H. J. Habing, P. Bouchet, C. Dominik, T, Encrenaz, A. Heske, M. Jourdain de Muizon, M. F. Kessler, R. Laureijs, K. Leech, L. Metcalfe, A. Salama, R. Siebenmorgen, N. Trams, C. Waelkens, L. B. F. M. Waters | title=First results from a photometric infrared survey for Vega-like disks around nearby main-sequence stars. | journal=Astronomy and Astrophysics | year=1996 | volume=315 | pages=L233–L236 | bibcode=1996A&A...315L.233H }}</ref> | |
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| This star is categorized as a [[BY Draconis variable]], with variable star designation V2133. The variability is attributed to large-scale magnetic activity on the [[chromosphere]] (in the form of [[starspot]]s) combined with a rotational period that moved the active regions into (and out of) the line of sight. This results in low amplitude variability of 12 Ophiuchi's luminosity. The star also appears to display rapid variation in luminosity, possibly due to changes in the starspots.<ref>{{cite journal | author=J. D. Dorren, E. F. Guinan, E. F. | title=Evidence for starspots on single solar-like stars | journal=Astronomical Journal | year=1982 | volume=87 | pages=1546–1557 | bibcode=1982AJ.....87.1546D | doi=10.1086/113245 }}</ref> Measurements of the long-term variability show two overlapping cycles of starspot activity (compared to the Sun's single, 11-year cycle.) The periods of these two cycles are 4.0 and 17.4 years.<ref>{{cite web | url = http://www.mtwilson.edu/hk/Cycles/ | title = H-K Project: Activity Cycles | publisher = Mount Wilson Observatory | accessdate = 2006-12-04 }}</ref>
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| This star is among the top 100 target stars for [[NASA]]'s planned [[Terrestrial Planet Finder]] mission [http://www.solstation.com/stars/12ophiu.htm]. However, the mission is now postponed indefinitely.
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| Its abundance of heavy elements (elements heavier than [[helium]]) is nearly identical to that of the Sun. The surface gravity is equal to <math>\log(g) = 4.6</math>, which is somewhat higher than the Sun's.<ref name="flynn_morel" /> The space velocity is 30 km/s relative to the solar system. The high rotation period and active chromosphere are indicative of a relatively young star.<ref>{{cite journal | author=H. J. Rocha-Pinto, B. V. Castilho, W. J. Maciel | title=Chromospherically young, kinematically old stars | journal=Astronomy & Astrophysics | year=2002 | volume=384 | issue=3 | pages=912–924 | url=http://www.aanda.org/index.php?option=com_base_ora&url=articles/aa/full/2002/12/aa1635/aa1635.right.html&access=standard&Itemid=81 | doi=10.1051/0004-6361:20011815 | bibcode=2002A&A...384..912R|arxiv = astro-ph/0112452 }}</ref><ref>{{cite journal | author=G. F. Porto de Mello, E. F. del Peloso, L. Ghezzi | title=Astrobiologically interesting stars within 10 parsecs of the Sun | journal=Astrobiology | year=2006 | volume=6 | issue=2 | pages=308–331 | url=http://www.liebertonline.com/doi/abs/10.1089/ast.2006.6.308 | doi=10.1089/ast.2006.6.308 | pmid=16689649 | bibcode=2006AsBio...6..308P|arxiv = astro-ph/0511180 }}</ref>
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| == References ==
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| {{reflist|30em|refs=
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| <ref name=aaa474_2_653>{{citation | last1=van Leeuwen | first1=F. | title=Validation of the new Hipparcos reduction | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | doi=10.1051/0004-6361:20078357 | bibcode=2007A&A...474..653V | arxiv=0708.1752 |date=November 2007}}</ref>
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| <ref name=mnras384_1_173>{{citation | last1=Fuhrmann | first1=Klaus | title=Nearby stars of the Galactic disc and halo - IV | journal=Monthly Notices of the Royal Astronomical Society | volume=384 | issue=1 | pages=173–224 | doi=10.1111/j.1365-2966.2007.12671.x | bibcode=2008MNRAS.384..173F |date=February 2008}}</ref>
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| <ref name="flynn_morel">{{citation | first1=C. | last1=Flynn | first2=O. | last2=Morel | title=Metallicities and kinematics of G and K dwarfs | journal=Monthly Notices of the Royal Astronomical Society | year=1997 | volume=286 | issue=3 | pages=617–625 | bibcode=1996astro.ph..9017F | arxiv=astro-ph/9609017 }}</ref>
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| <ref name=apj510_2_L135>{{citation | last1=Soon | first1=Willie | last2=Frick | first2=Peter | last3=Baliunas | first3=Sallie | first4=W. | last4=Soon | first4=P. | last4=Frick | first4=S. | last4=Baliunas | title=Lifetime of Surface Features and Stellar Rotation: A Wavelet Time-Frequency Approach | journal=The Astrophysical Journal | year=1999 | volume=510 | issue=2 | pages=L135–L138 | bibcode=1999ApJ...510L.135S | doi=10.1086/311805 | arxiv=astro-ph/9811114 }}</ref>
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| <ref name="apj687">{{citation | last1=Mamajek | first1=Eric E. | last1=Hillenbrand | first1=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 |date=November 2008}}</ref>
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| }}
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| == External links ==
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| * {{cite web | url = http://www.solstation.com/stars/12ophiu.htm | title = V2133 / 12 Ophiuchi | publisher = SolStation | accessdate = 2006-12-01 }}
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| {{Nearest star systems|7}}
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| {{Stars of Ophiuchus}}
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| [[Category:Ophiuchus (constellation)]]
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| [[Category:BY Draconis variables]]
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| [[Category:K-type main-sequence stars]]
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| [[Category:Solar-type stars|Ophiuchi, 12]]
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| [[Category:Flamsteed objects|Ophiuchi, 12]]
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| [[Category:Henry Draper Catalogue objects|149661]]
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| [[Category:Hipparcos objects|081300]]
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| [[Category:HR objects|6171]]
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| [[Category:Gliese and GJ objects|0631]]
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| [[Category:Objects named with variable star designations|Ophiuchi, V2133]]
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| [[Category:Objects within 100 ly of Earth]]
| |
Friends contact her Felicidad and her husband doesn't like it at all. The thing she adores most is to play handball but she can't make it her profession. Years in the past we moved to Arizona but my wife wants us to transfer. Bookkeeping has been his working day job for a while.
my web blog: http://Facegospel.noalvo.org/