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| {{Starbox begin
| | Hi there. My title is Sophia Meagher even though it is not the name on my birth certification. Mississippi is where her house is but her husband desires them to move. I am truly fond of handwriting but I can't make it my profession truly. Invoicing is what I do.<br><br>Here is my webpage :: authentic psychic readings ([http://www.seekavideo.com/playlist/2199/video/ seekavideo.com]) |
| | name = Gamma Hydrae
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| }}
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| {{Starbox image
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| | image =
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| <div style="position: relative">[[File:Hydra IAU.svg|250px|alt=Diagram showing star positions and boundaries of the Hydra constellation and its surroundings]]
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| <div style="position: absolute; left: 25.0%; top: 53.8%;">[[File:Cercle rouge 100%.svg|12px]]</div>
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| </div>
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| | caption=Location of γ Hydrae (circled)
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| }}
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| {{Starbox observe
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| | epoch = [[J2000.0]]
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| | constell = [[Hydra (constellation)|Hydra]]
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| | ra = {{RA|13|18|55.29719}}<ref name=aaa474_2_653/>
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| | dec = {{DEC|–23|10|17.4514}}<ref name=aaa474_2_653/>
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| | appmag_v = +2.993<ref name=sps1966/>
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| }}
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| {{Starbox character
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| | class = G8 III<ref name=pasj60_4_781/>
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| | b-v = +0.920<ref name=sps1966/>
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| | u-b = +0.645<ref name=sps1966/>
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| | variable =
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| }}
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| {{Starbox astrometry
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| | radial_v = –5.4<ref name=scfs/>
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| | prop_mo_ra = +68.99<ref name=aaa474_2_653/>
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| | prop_mo_dec = –41.85<ref name=aaa474_2_653/>
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| | parallax = 24.37
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| | p_error = 0.15
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| | parallax_footnote = <ref name=aaa474_2_653/>
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| | absmag_v = –0.15<ref name=pasj60_4_781/>
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| }}
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| {{Starbox detail
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| | mass = 2.94<ref name=pasj60_4_781/>
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| | radius = 13<ref name=lang2006/>
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| | gravity = 3.02<ref name=mnras374_2_664/>
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| | metal_fe = –0.06<ref name=mnras374_2_664/>
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| | age_myr = 372<ref name=pasj60_4_781/>
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| | luminosity = 115<ref name=pasj60_4_781/>
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| | temperature = 5,087<ref name=mnras374_2_664/>
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| | rotational_velocity = 8<ref name=coapa239_1/>
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| }}
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| {{Starbox catalog
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| | names = 46 Hydrae, [[Bonner Durchmusterung|BD]]–22 3554, FK5 495, [[Henry Draper catalogue|HD]] 115659, [[Hipparcos catalogue|HIP]] 64962, [[Harvard Revised catalogue|HR]] 5020, [[New Catalogue of Suspected Variable Stars|NSV]] 6180, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 181543.<ref name=SIMBAD/>
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| }}
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| {{Starbox end}}
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| '''Gamma Hydrae''' (γ Hya, γ Hydrae) is a [[star]] in the [[celestial equator|equatorial]] [[constellation]] of [[Hydra (constellation)|Hydra]]. It has an [[apparent visual magnitude]] of 3.0,<ref name=sps1966/> placing it [[List of stars in Hydra|second in brightness]] among the members of this generally faint constellation. Based upon [[parallax]] measurements made during the [[Hipparcos]] mission, this star is at a distance of around {{Convert|133.8|ly|pc|abbr=off|lk=on}} from Earth.<ref name=aaa474_2_653/>
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| The [[spectrum]] of this star matches a [[stellar classification]] of G8 III,<ref name=pasj60_4_781/> with the [[luminosity class]] of III indicating it has [[stellar evolution|evolved]] into a [[giant star]] after exhausting the supply of hydrogen at its core. The [[interferometry]]-measured uniform disk [[angular diameter]] of this star is {{nowrap|2.96 ± 0.15 [[milliarcseconds|mas]]}},<ref name=aaa431_773/> which, at its estimated distance, equates to a physical radius of roughly 13 times the [[Solar radius|radius of the Sun]].<ref name=lang2006/> It has nearly three<ref name=pasj60_4_781/> times the [[solar mass|mass of the Sun]] and is radiating 115<ref name=pasj60_4_781/> times the [[solar luminosity|Sun's luminosity]] from its [[stellar atmosphere|outer atmosphere]] at an [[effective temperature]] of 5,019 K.<ref name=pasj60_4_781/> This heat gives it the yellow glow of a [[K-type star]].<ref name=csiro/> Despite having reached an advanced stage in its evolution, it is considerably younger than the Sun with an age of around 372 million years. This is because higher mass stars consume their nuclear fuel at a more rapid rate.<ref name=pasj60_4_781/>
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| ==In culture==
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| γ Hya appears on the [[flag of Brazil]], symbolising the state of [[Acre (state)|Acre]].<ref name=flag/>
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| In the television show ''[[Star Trek: The Original Series]]'', the [[starship Enterprise]] visits a planet named Gamma Hydrae IV in the episode "[[The Deadly Years]]". Within the same fictional setting, a region of space designated "Section 10" of Gamma Hydrae lies within a demilitarized area called the [[Klingon Neutral Zone]]. This comes into play during the [[Kobayashi Maru]] scenario depicted in the film ''[[Star Trek II: The Wrath of Khan]]''.
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| == References ==
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| {{reflist|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=pasj60_4_781>{{citation | last1=Takeda | first1=Yoichi | last2=Sato | first2=Bun'ei | last3=Murata | first3=Daisuke | title=Stellar Parameters and Elemental Abundances of Late-G Giants | journal=Publications of the Astronomical Society of Japan | volume=60 | issue=4 | pages=781–802 |date=August 2008 | bibcode=2008PASJ...60..781T |arxiv = 0805.2434 }}</ref>
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| <ref name=mnras374_2_664>{{citation | display-authors=1 | last1=Cenarro | first1=A. J. | last2=Peletier | first2=R. F. | last3=Sánchez-Blázquez | first3=P. | last4=Selam | first4=S. O. | last5=Toloba | first5=E. | last6=Cardiel | first6=N. | last7=Falcón-Barroso | first7=J. | first8=Gorgas | last8=J. | last9=Jiménez-Vicente | first9=J. | title=Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters | journal=Monthly Notices of the Royal Astronomical Society | volume=374 | issue=2 | pages=664–690 |date=January 2007 | doi=10.1111/j.1365-2966.2006.11196.x | bibcode=2007MNRAS.374..664C |arxiv = astro-ph/0611618 }}</ref>
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| <ref name=scfs>{{citation | display-authors=1 | title=Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions | last1=Wielen | first1=R. | last2=Schwan | first2=H. | last3=Dettbarn | first3=C. | last4=Lenhardt | first4=H. | last5=Jahreiß | first5=H. | last6=Jährling | first6=R. | publisher=Astronomisches Rechen-Institut Heidelberg | issue=35 | year=1999 | bibcode=1999VeARI..35....1W }}</ref>
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| <ref name=coapa239_1>{{citation | last1=Bernacca | first1=P. L. | last2=Perinotto | first2=M. | title=A catalogue of stellar rotational velocities | journal=Contributi Osservatorio Astronomico di Padova in Asiago | volume=239 | issue=1 | year=1970 | bibcode=1970CoAsi.239....1B }}</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=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=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_* | |
| & = \frac{(10^{-3}\cdot 41.0\cdot 2.96)\ \text{AU}}{0.0046491\ \text{AU}/R_{\bigodot}} \\
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| & \approx 26\cdot R_{\bigodot}
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| \end{align}</math></ref>
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| <ref name=SIMBAD>{{citation | title=gam Hya -- Variable Star | work=SIMBAD Astronomical Object Database | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Gamma+Hydrae | accessdate=2012-02-23 }}</ref>
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| <ref name=flag>{{citation | title=Astronomy of the Brazilian Flag | url=http://www.fotw.net/flags/br_astro.html | publisher=FOTW Flags Of The World website }}</ref>
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| }}
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| {{Stars of Hydra}}
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| [[Category:Bayer objects|Hydrae, Gamma]]
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| [[Category:Flamsteed objects|Hydrae, 46]]
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| [[Category:Hydra (constellation)]]
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| [[Category:G-type giants]]
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Hi there. My title is Sophia Meagher even though it is not the name on my birth certification. Mississippi is where her house is but her husband desires them to move. I am truly fond of handwriting but I can't make it my profession truly. Invoicing is what I do.
Here is my webpage :: authentic psychic readings (seekavideo.com)