<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0035-001X</journal-id>
<journal-title><![CDATA[Revista mexicana de física]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. fis.]]></abbrev-journal-title>
<issn>0035-001X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Física]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0035-001X2002000500010</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Periodic orbits for the elliptic case of the Sun-Earth-Moon problem in new coordinates]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Escalona-Buendía]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piña]]></surname>
<given-names><![CDATA[E.]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[Iztapalapa Distrito Federal]]></addr-line>
<country>México</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2002</year>
</pub-date>
<volume>48</volume>
<numero>5</numero>
<fpage>433</fpage>
<lpage>449</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0035-001X2002000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0035-001X2002000500010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0035-001X2002000500010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[We present a set of periodic and quasi-periodic orbits for the bidimensional case of the Sun-Earth-Moon problem using the coordinates recently introduced by Piria and Jimenez-Lara. Eliminating the restriction we used in a previous work that Earth-Moon system describes a circular orbit around the Sun, we recover the periodic orbits we have found, and we find periodic orbits for the elliptic case. We also find quasi-periodic orbits closer to the real case.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Presentamos un conjunto de órbitas periódicas y cuasi-periódicas para el caso bidimensional del problema Sol-Tierra-Luna, utilizando las coordenadas recientemente propuestas por E. Piña y L. Jiménez-Lara. Eliminando la restricción que hablamos utilizado en un trabajo anterior, de que el sistema Tierra-Luna describe una órbita circular en torno al Sol, recuperamos las soluciones periódicas que hablamos encontrado y encontramos soluciones periódicas para el caso elíptico; además de órbitas cuasi-periódicas cercanas al caso real.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Three body problem]]></kwd>
<kwd lng="en"><![CDATA[Moon theory]]></kwd>
<kwd lng="en"><![CDATA[celestial mechanics]]></kwd>
<kwd lng="es"><![CDATA[Problema de tres cuerpos]]></kwd>
<kwd lng="es"><![CDATA[teoría lunar]]></kwd>
<kwd lng="es"><![CDATA[mecánica celeste]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Investigaci&oacute;n</font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="4"><b>Periodic orbits for the elliptic case of the Sun&#45;Earth&#45;Moon problem in new</b> <b>coordinates</b></font></p>  	    <p>&nbsp;</p>  	    <p align="center"><font face="verdana" size="2"><b>A. Escalona&#45;Buend&iacute;a<sup>&dagger;</sup> and E. Pi&ntilde;a<sup>&Dagger;</sup></b></font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><i>Departamento. de F&iacute;sica, Universidad Aut&oacute;noma Metropolitana &#45; Iztapalapa. Apdo. Post. 55534. M&eacute;xico, D. F. 09340, M&eacute;xico.</i> <sup>&dagger;</sup> <a href="mailto:aheb@xanum.uam.mx">aheb@xanum.uam.mx</a></font></p> 	    <p align="justify"><font face="verdana" size="2"><sup>&Dagger;</sup> <a href="mailto:pge@xanum.uam.mx">pge@xanum.uam.mx</a><a href="mailto:pge@xanum.uam.mx"></a></font></p>      <p>&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Recibido el 29 de abril de 2002.    <br> 	Aceptado el 17 de junio de 2002.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Abstract</b></font></p>  	    <p align="justify"><font face="verdana" size="2">We present a set of periodic and quasi&#45;periodic orbits for the bidimensional case of the Sun&#45;Earth&#45;Moon problem using the coordinates recently introduced by Piria and Jimenez&#45;Lara. Eliminating the restriction we used in a previous work that Earth&#45;Moon system describes a circular orbit around the Sun, we recover the periodic orbits we have found, and we find periodic orbits for the elliptic case. We also find quasi&#45;periodic orbits closer to the real case.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Keywords:</b> Three body problem; Moon theory; celestial mechanics.</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>Resumen</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Presentamos un conjunto de &oacute;rbitas peri&oacute;dicas y cuasi&#45;peri&oacute;dicas para el caso bidimensional del problema Sol&#45;Tierra&#45;Luna, utilizando las coordenadas recientemente propuestas por E. Pi&ntilde;a y L. Jim&eacute;nez&#45;Lara. Eliminando la restricci&oacute;n que hablamos utilizado en un trabajo anterior, de que el sistema Tierra&#45;Luna describe una &oacute;rbita circular en torno al Sol, recuperamos las soluciones peri&oacute;dicas que hablamos encontrado y encontramos soluciones peri&oacute;dicas para el caso el&iacute;ptico; adem&aacute;s de &oacute;rbitas cuasi&#45;peri&oacute;dicas cercanas al caso real.</font></p>      <p align="justify"><font face="verdana" size="2"><b>Descriptores:</b> Problema de tres cuerpos; teor&iacute;a lunar; mec&aacute;nica celeste.</font></p>  	    ]]></body>
<body><![CDATA[<p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2">PACS: 46.10.&#45;z; 95.10.Ce; 96.20.&#45;n</font></p>  	    <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><a href="/pdf/rmf/v48n5/v48n5a10.pdf" target="_blank">DESCARGAR ART&Iacute;CULO EN FORMATO PDF</a></font></p>     <p>&nbsp;</p>  	    <p align="justify"><font face="verdana" size="2"><b>References</b></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">1. A. Escalona Buend&iacute;a &amp; E. Pi&ntilde;a, <i>Rev. Mex. de F&iacute;s.</i> <b>47</b> (2001) 525.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289129&pid=S0035-001X200200050001000001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">2. E. Pi&ntilde;a, <i>Celest. Mech.</i> <b>74</b> (1999) 163.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289131&pid=S0035-001X200200050001000002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">3. E. Pi&ntilde;a &amp; L. Jim&eacute;nez&#45;Lara, <i>Celest. Mech.</i> <b>81</b> (2002) 1.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289133&pid=S0035-001X200200050001000003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">4. Moshier S. AAv.5.4 Free Software, <a href="mailto:moshier@na&#45;net.ornl.gov">moshier@na&#45;net.ornl.gov</a></font>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289135&pid=S0035-001X200200050001000004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><p align="justify"><font face="verdana" size="2">5. <i>Astronomical Almanac</i> (U. S. Government Printing Office, 2001).</font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">6. M. Gutzwiller, <i>Rev. Mod. Phys.</i> <b>70</b> (1998) 589.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289137&pid=S0035-001X200200050001000005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">7. E. Pi&ntilde;a &amp; L. Jim&eacute;nez&#45;Lara, <i>Physica D</i><b> 26</b> (1987) 369.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289139&pid=S0035-001X200200050001000006&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">8. L. Jim&eacute;nez&#45;Lara &amp; A. Escalona&#45;Buend&iacute;a, <i>Celest. Mech.</i> <b>79</b> (2001) 97.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289141&pid=S0035-001X200200050001000007&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    ]]></body>
<body><![CDATA[<!-- ref --><p align="justify"><font face="verdana" size="2">9. D. Brouwer &amp; G. Hori, <i>Physics and Astronomy of the Moon</i> (Academic Press, New York, 1962).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289143&pid=S0035-001X200200050001000008&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>  	    <!-- ref --><p align="justify"><font face="verdana" size="2">10. V. Szebehely, <i>Theory of Orbits; the Restricted Problem of Three Bodies</i> (Academic&#45;Press, New York, 1967).    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=8289145&pid=S0035-001X200200050001000009&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --></font></p>      ]]></body><back>
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