<?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>0370-3908</journal-id>
<journal-title><![CDATA[Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. acad. colomb. cienc. exact. fis. nat.]]></abbrev-journal-title>
<issn>0370-3908</issn>
<publisher>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0370-39082017000200244</article-id>
<article-id pub-id-type="doi">10.18257/raccefyn.449</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Caldas y el gran cometa de 1807]]></article-title>
<article-title xml:lang="en"><![CDATA[Caldas and the great comet of 1807]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Portilla]]></surname>
<given-names><![CDATA[J. Gregorio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Ciencias Observatorio Astronómico Nacional]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>03</month>
<year>2017</year>
</pub-date>
<volume>41</volume>
<numero>159</numero>
<fpage>244</fpage>
<lpage>252</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0370-39082017000200244&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0370-39082017000200244&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0370-39082017000200244&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Se analizan las observaciones que realizó Francisco José de Caldas del gran cometa de 1807. A partir de distintas observaciones realizadas por astrónomos europeos, así como del conocimiento de los elementos orbitales del cometa, se calculó su trayectoria y se comparó con lo que observó Caldas, en particular, sobre su observación del 26 de septiembre de 1807, la que incluye coordenadas. Se discuten algunos aspectos tales como la forma como calculó las coordenadas del cometa así como la descripción morfológica del mismo. Se infiere la existencia de algún fenómeno atmosférico que dificultó, para Caldas, la observación adecuada de la cola del cometa. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Observations of the great comet of 1807 carried out by Francisco José de Caldas are analyzed. Starting from astronomical observations obtained by European astronomers as well as the knowledge of the orbital elements, the trajectory of the comet is calculated and then is compared with those reported by Caldas, in particular that of the 26 of september of 1807 which includes coordinates. Items such as how Caldas calculated the coordinates along with morphological description of the object is discussed. We infer the existence of some type of atmospheric phenomena which hindered, for Caldas, the ideal observation of the tail. © 2017. Acad. Colomb. Cienc. Ex. Fis. Nat.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Caldas, F. J.]]></kwd>
<kwd lng="es"><![CDATA[Cometa]]></kwd>
<kwd lng="es"><![CDATA[Gran cometa de 1807]]></kwd>
<kwd lng="en"><![CDATA[Caldas, F. J.]]></kwd>
<kwd lng="en"><![CDATA[Comet]]></kwd>
<kwd lng="en"><![CDATA[Great comet of 1807]]></kwd>
</kwd-group>
</article-meta>
</front><back>
<ref-list>
<ref id="B1">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Bode]]></surname>
<given-names><![CDATA[J. E.]]></given-names>
</name>
</person-group>
<source><![CDATA[Uranographia Sive Astrorum Descriptio]]></source>
<year>1801</year>
<publisher-loc><![CDATA[Berlín ]]></publisher-loc>
</nlm-citation>
</ref>
<ref id="B2">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caballero]]></surname>
<given-names><![CDATA[J.M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Particularidades de Santafé]]></source>
<year>1946</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Biblioteca Popular de Cultura Colombiana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B3">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caldas]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Semanario del Nuevo Reino de Granada]]></source>
<year>1942</year>
<volume>1</volume>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Biblioteca Popular de Cultura Colombiana]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B4">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caldas]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Obras Completas de Francisco José de Caldas]]></source>
<year>1966</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Nacional de Colombia, Imprenta Nacional]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B5">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caldas]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cartas de Caldas]]></source>
<year>1978</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales &amp; Colciencias]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B6">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Caldas]]></surname>
<given-names><![CDATA[F. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cartas de Caldas Ilustradas]]></source>
<year>2016</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Universidad Distrital Francisco José de Caldas, Asociación de Amigos de la Casa Museo Caldas y Academia Colombiana de Ciencias Exactas, Físicas y Naturales]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B7">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Díaz]]></surname>
<given-names><![CDATA[S.]]></given-names>
</name>
</person-group>
<source><![CDATA[Nueva Aproximación a Francisco José de Caldas]]></source>
<year>1997</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Academia Colombiana de Historia, Editora Guadalupe]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B8">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Farrar]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[An Elementary Treatise on Astronomy]]></source>
<year>1827</year>
<publisher-loc><![CDATA[Cambridge ]]></publisher-loc>
<publisher-name><![CDATA[Hilliard Metcalf and Co.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B9">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fortin]]></surname>
<given-names><![CDATA[M. J.]]></given-names>
</name>
</person-group>
<source><![CDATA[Atlas Céleste de Flamstéed]]></source>
<year>1776</year>
<publisher-loc><![CDATA[París ]]></publisher-loc>
<publisher-name><![CDATA[Approuve par l&#8217;Académie Royale des Sciences, F. G. Deschamps]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B10">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Guevara-Murua]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Clim. Past.]]></source>
<year>2014</year>
<volume>10</volume>
</nlm-citation>
</ref>
<ref id="B11">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández-de-Alba]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Historia Documental de la Real Expedición Botánica del Nuevo Reino de Granada después de la muerte de su director Don José Celestino Mutis 1808-1952]]></source>
<year>1986</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Fundación Segunda Expedición Botánica, Editora Guadalupe]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B12">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hockey]]></surname>
<given-names><![CDATA[T.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Biographical Encyclopedia of Astronomers]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Nueva York ]]></publisher-loc>
<publisher-name><![CDATA[Springer]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B13">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Humboldt]]></surname>
<given-names><![CDATA[A.]]></given-names>
</name>
</person-group>
<source><![CDATA[Alexander Von Humboldt en Colombia. Extractos de sus diarios]]></source>
<year>1982</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Academia Colombiana de Ciencias Exactas, Físicas y Naturales &amp; Academia de Ciencias de la República Democrática Alemana, Publicismo y Ediciones]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B14">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Kronk]]></surname>
<given-names><![CDATA[G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Cometography: A Catalog of Comets]]></source>
<year>2003</year>
<volume>2</volume>
<page-range>1800-99</page-range><publisher-loc><![CDATA[Cambridge ]]></publisher-loc>
<publisher-name><![CDATA[Cambridge University Press]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B15">
<nlm-citation citation-type="">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Moreno]]></surname>
<given-names><![CDATA[F.]]></given-names>
</name>
</person-group>
<source><![CDATA[El Astrolabio]]></source>
<year>2005</year>
<volume>5</volume>
<page-range>18</page-range></nlm-citation>
</ref>
<ref id="B16">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Nieto]]></surname>
<given-names><![CDATA[M.]]></given-names>
</name>
</person-group>
<source><![CDATA[Orden natural y orden social: ciencia y política en el Semanario del Nuevo Reyno de Granada]]></source>
<year>2007</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Legis S. A.]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B17">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Portilla]]></surname>
<given-names><![CDATA[J. G.]]></given-names>
</name>
</person-group>
<source><![CDATA[Elementos de Astronomía de Posición]]></source>
<year>2009</year>
<publisher-loc><![CDATA[Bogotá ]]></publisher-loc>
<publisher-name><![CDATA[Editorial Universidad Nacional de Colombia]]></publisher-name>
</nlm-citation>
</ref>
<ref id="B18">
<nlm-citation citation-type="book">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Russell]]></surname>
<given-names><![CDATA[J.]]></given-names>
</name>
</person-group>
<source><![CDATA[The Comets: A Descriptive Treatise Upon These Bodies]]></source>
<year>1852</year>
<publisher-loc><![CDATA[Londres ]]></publisher-loc>
<publisher-name><![CDATA[John W. Parker and Son]]></publisher-name>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
