{"id":38001,"date":"2006-08-22T02:54:00","date_gmt":"2006-08-22T02:54:00","guid":{"rendered":"http:\/\/weblogs.madrimasd.org\/\/astrofisica\/archive\/2006\/08\/22\/38001.aspx"},"modified":"2006-08-22T02:54:00","modified_gmt":"2006-08-22T02:54:00","slug":"el-baile-de-los-planetas-ii","status":"publish","type":"post","link":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/2006\/08\/22\/38001","title":{"rendered":"El baile de los planetas (II)"},"content":{"rendered":"
David Barrado y Navascu\u00e9s<\/p>\n

Seguimos con la discusi\u00f3n sobre qu\u00e9 es y qu\u00e9 no es un planeta…<\/p><\/div>\n

<\/p>\n

La reuni\u00f3n de la asamblea general de la Uni\u00f3n Astron\u00f3mica Internacional continua en Praga. En los diferentes corrillos domina la conversaci\u00f3n sobre la propuesta de definici\u00f3n del t\u00e9rmino \u00abplaneta<\/b>\u00ab. Me comentan que el disgusto de un n\u00famero significativo de astr\u00f3nomos es grande, el desacuerdo es evidente.  La pol\u00edtica domina. El sector americano insiste en conservar el status para Plut\u00f3n, y garantizarlo para 2003 UB(313), ambos descubiertos por americanos, de manera que el Sistema Solar contendr\u00eda doce planetas en lugar de los nueve tradicionales (o los ocho si se eliminase a Plut\u00f3n de la lista, opci\u00f3n que yo apoyo). El lobby funciona a diferentes niveles. Un ejemplo, art\u00edculo de Gibor Basri y Mike Brown<\/a> (descubridor de 2003 UB) en astro-ph, el repositorio de  art\u00edculos astron\u00f3micos, esta misma ma\u00f1ana.<\/p>\n

Mientas tanto, una propuesta alternativa adquiere m\u00e1s y m\u00e1s fuerza. La votaci\u00f3n ser\u00e1 este mismo jueves.<\/p>\n

Propuesta alternativa, que traducir\u00e9 a lo largo de la ma\u00f1ana (cortes\u00eda de Javier Licandro): <\/p>\n

New proposal for Resolution 5: Definition of a Planet<\/b><\/font><\/font><\/p>\n

(1) A planet is a celestial body that (a) is by far the largest object in its local population [1], (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape [2], (c) does not produce energy by any nuclear fusion mechanism [3].<\/p>\n

<\/font><\/font><\/span><\/font><\/font> <\/p>\n

(2) According to point (1) the eight classical planets discovered before 1900, which move in nearly circular orbits close to the ecliptic plane are the only planets of our Solar System. All the other objects in orbit around the Sun are smaller than Mercury. We recognize that there are objects that fulfill the criteria (b) and (c) but not criterion (a). Those objects are defined as \u00abdwarf\u00bb planets. Ceres as well as Pluto and several other large Trans-Neptunian objects belong to this category. In contrast to the planets, these objects typically have highly inclined orbits and\/or large eccentricities. <\/font><\/font><\/span><\/font><\/font> <\/p>\n


(3) All the other natural objects orbiting the Sun that do not fulfill any of the previous criteria shall be referred to collectively as \u201cSmall Solar System Bodies\u201d.[4]<\/font><\/font><\/span><\/font><\/font><\/p>\n

PD: Traducci\u00f3n de la propuesta alternativa.<\/p>\n

Un planeta es un objeto celeste que:
a) es el de mayor objeto de la poblaci\u00f3n local,
b) contiene suficiente masa como para que su fuerza de gravedad sea dominante, de manera que se encuentre en equilibrio hidrost\u00e1tico,
c) no produce energ\u00eda a partir de reacciones nucleares de fusi\u00f3n.<\/p>\n

ENLACES:
 Planetas: preguntas y respuestas de la IAU<\/a><\/p>\n

M\u00e1s en:
 El baile de los planetas<\/a>
El baile de los planetas (II)<\/a>
 El baile de los planetas (III)<\/a>
 \u00bfQu\u00e9 es un planeta?… <\/a><\/p>\n<\/div>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

David Barrado y Navascu\u00e9s Seguimos con la discusi\u00f3n sobre qu\u00e9 es y qu\u00e9 no es un planeta…<\/p>\n","protected":false},"author":32,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0},"categories":[64,60,554,559],"tags":[],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":4}},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/posts\/38001"}],"collection":[{"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/users\/32"}],"replies":[{"embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/comments?post=38001"}],"version-history":[{"count":0,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/posts\/38001\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/media?parent=38001"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/categories?post=38001"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/tags?post=38001"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}