<?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>0185-1101</journal-id>
<journal-title><![CDATA[Revista mexicana de astronomía y astrofísica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. mex. astron. astrofis]]></abbrev-journal-title>
<issn>0185-1101</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Astronomía]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-11012017000200014</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Searching for Artificial Equilibrium Points to Place Satellites &#8220;Above and Below&#8221; L3 in the Sun-Earth System]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Almeida Jr.]]></surname>
<given-names><![CDATA[A. K. de]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Prado]]></surname>
<given-names><![CDATA[Antonio F. B. A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sanchez]]></surname>
<given-names><![CDATA[Diogo M.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yokoyama]]></surname>
<given-names><![CDATA[Tadashi]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Instituto Nacional de Pesquisas Espaciais  ]]></institution>
<addr-line><![CDATA[São José dos Campos SP]]></addr-line>
<country>Brazil</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidade Estadual Paulista  ]]></institution>
<addr-line><![CDATA[ SP]]></addr-line>
<country>Brazil</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2017</year>
</pub-date>
<volume>53</volume>
<numero>2</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-11012017000200014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-11012017000200014&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-11012017000200014&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT Regarding practical applications of L3 of the Sun-Earth system, there are few studies with the goal of placing a spacecraft at this point, or in orbit around it. One of the main problems in placing a spacecraft near this equilibrium point is the fact that it is located behind the Sun with respect to the Earth. The Sun would be blocking direct communication between the spacecraft and the Earth. The present research gives several options to solve this problem by using a solar sail to place one or two spacecraft above and/or below the Ecliptic plane. This sail could also be used for the mission itself, to collect energy or particles. By using an adequate size, location and attitude of the solar sail, the equilibrium point can be moved from its original location to allow communications between the spacecraft and the Earth. A preliminary study of a solar sail that uses this strategy is shown here.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN En relación al punto L3 del sistema Sol-Tierra, hay pocos estudios para colocar naves espaciales cerca de ese punto de equilibrio, debido a la dificultad de comunicarse con la nave, pues ésta se encuentra detrás del Sol vista desde la Tierra. Nuestro estudio proporciona varas opciones para resolver este problema, mediante el uso de una vela solar para colocar una o dos naves arriba o abajo del plano de la eclíptica. Esta vela también podría servir para recolectar energía o partículas. Con un tamaño, localización y actitud adecuados para la vela solar, el punto de equilibrio puede alejarse de su posición original para permitir la comunicación entre la nave y la tierra. Se presenta un estudio preliminar que emplea esta estrategia para la comunicación.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[celestial mechanics]]></kwd>
<kwd lng="en"><![CDATA[occultations]]></kwd>
<kwd lng="en"><![CDATA[planets and satellites]]></kwd>
<kwd lng="en"><![CDATA[general]]></kwd>
<kwd lng="en"><![CDATA[space vehicles]]></kwd>
<kwd lng="en"><![CDATA[instuments]]></kwd>
</kwd-group>
</article-meta>
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