{"id":38228,"date":"2006-08-24T09:49:00","date_gmt":"2006-08-24T09:49:00","guid":{"rendered":"http:\/\/weblogs.madrimasd.org\/\/astrofisica\/archive\/2006\/08\/24\/38228.aspx"},"modified":"2006-08-24T09:49:00","modified_gmt":"2006-08-24T09:49:00","slug":"los-ocho-magnificos-pluton-no-es-un-planeta","status":"publish","type":"post","link":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/2006\/08\/24\/38228","title":{"rendered":"Los ocho magn\u00edficos: Plut\u00f3n no es un planeta"},"content":{"rendered":"
David Barrado y Navascu\u00e9s<\/p>\n

Se vot\u00f3… Plut\u00f3n no es un planeta. <\/div>\n

<\/p>\n

\n
La Uni\u00f3n Astron\u00f3mica Internacional, en su asamblea plenaria delebrada en Praga, finalmente ha establecido una definici\u00f3n del t\u00e9rmino planeta<\/b>, al menos en lo referente al Sistema Solar. Seg\u00fan la misma, Plut\u00f3n deja de ser un planeta, para pasar a ser el prototipo de un nuevo tipo de objetos, los \u00abplanetas enanos\u00bb. Sustantivo y nombre van juntos. Tal vez un gui\u00f3n uni\u00e9ndolos ser\u00eda lo m\u00e1s apropiado, o el acu\u00f1ar una palabra en castellano. La propuesta denomin\u00e1ndolos \u00abplutonianos\u00bb no ha sido aceptada.<\/p>\n


El \u00abnuevo Sistema Solar\u00bb, donde claramente se distingue ente los ocho planetas y los \u00abplanetas enanos\u00bb (Ceres, Plut\u00f3n, y 2003UB(313) -nombre provisional). Cr\u00e9dito IAU.<\/i><\/p>\n

Dentro de la categor\u00eda de \u00abplaneta enano\u00bb se encuentran Plut\u00f3n, Ceres y 2003UB(313).<\/p>\n

Por tanto, el Sistema Solar se queda con ocho planetas: Mercurio, Venus, la Tierra, Marte, J\u00fapiter, Saturno, Urano y Neptuno.<\/p>\n

<\/div>\n


<\/strong> <\/p>\n

\n

The IAU members gathered at the 2006 General Assembly agreed that a \u00abplanet\u00bb is defined as a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit. <\/p>\n

This means that the Solar System consists of eight \u00abplanets\u00bb Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune. A new distinct class of objects called \u00abdwarf planets\u00bb was also decided. It was agreed that \u00abplanets\u00bb and \u00abdwarf planets\u00bb are two distinct classes of objects. The first members of the \u00abdwarf planet\u00bb category are Ceres, Pluto and 2003 UB313 (temporary name). More \u00abdwarf planets\u00bb are expected to be announced by the IAU in the coming months and years. Currently a dozen candidate \u00abdwarf planets\u00bb are listed on IAU’s \u00abdwarf planet\u00bb watchlist, which keeps changing as new objects are found and the physics of the existing candidates becomes better known.<\/p>\n

The \u00abdwarf planet\u00bb Pluto is recognised as an important proto-type of a new class of trans-Neptunian objects. The IAU will set up a process to name these objects.<\/p>\n

Below are the planet definition Resolutions that were passed.<\/p>\n


RESOLUTION 5A<\/strong>
The IAU therefore resolves that \u00abplanets\u00bb and other bodies in our Solar System be defined into three distinct categories in the following way:<\/p>\n

(1) A \u00abplanet\u00bb1<\/sup> is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.<\/p>\n

(2) A \u00abdwarf planet\u00bb is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape2<\/sup> , (c) has not cleared the neighbourhood around its orbit, and (d) is not a satellite.<\/p>\n

(3) All other objects3<\/sup> except satellites orbiting the Sun shall be referred to collectively as \u00abSmall Solar-System Bodies\u00bb.

1<\/sup>The eight planets are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
2<\/sup>An IAU process will be established to assign borderline objects into either dwarf planet and other categories.
3<\/sup>These currently include most of the Solar System asteroids, most Trans-Neptunian Objects (TNOs), comets, and other small bodies. <\/p>\n

 <\/p>\n

<\/a> RESOLUTION 6A<\/strong>
The IAU further resolves:<\/p>\n

Pluto is a \u00abdwarf planet\u00bb by the above definition and is recognized as the prototype of a new category of trans-Neptunian objects.<\/p><\/div>\n

PD: <\/p>\n

  • SEA\/IAU: Los Planetas del Sistema Solar y la nueva definici\u00f3n de la Uni\u00f3n Astron\u00f3mica Internacional<\/a><\/b> <\/li>\n","protected":false},"excerpt":{"rendered":"

    David Barrado y Navascu\u00e9s Se vot\u00f3… Plut\u00f3n 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":[64,553,60,554,559],"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\/38228"}],"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=38228"}],"version-history":[{"count":0,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/posts\/38228\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/media?parent=38228"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/categories?post=38228"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.madrimasd.org\/blogs\/astrofisica\/wp-json\/wp\/v2\/tags?post=38228"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}