{"id":571,"date":"2016-02-19T11:42:03","date_gmt":"2016-02-19T11:42:03","guid":{"rendered":"http:\/\/www.astronotas.org\/messier\/?p=571"},"modified":"2019-12-01T16:00:16","modified_gmt":"2019-12-01T20:00:16","slug":"m31","status":"publish","type":"post","link":"https:\/\/www.astronotas.org\/messier\/m31\/","title":{"rendered":"Messier 31"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/031.gif\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"318\" height=\"318\" src=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/031.gif?resize=318%2C318\" alt=\"M31\" class=\"wp-image-1190\"\/><\/a><\/figure>\n\n\n\n<p><strong>Objeto: M31<\/strong><\/p>\n\n\n\n<p>Constelaci\u00f3n: Andromeda<br>Fecha: 1994.07.17 | Hora: 06:39 UT<br>Lugar: Jauca, Santa Isabel, PR<\/p>\n\n\n\n<p>Tipo de objeto: Galaxia espiral<br>Nombre: Galaxia de Andr\u00f3meda, NGC 224<br>Magnitud: 3.4 | Tama\u00f1o: 178&#8242; x 63&#8242;<br>A.R. 0h42.7m | Dec. 41\u00b016&#8242;<br>\u00c9poca: 2000.0<\/p>\n\n\n\n<p>Instrumento: Meade MTS-SN 6<br>Ocular: 25 mm. MA | Aumento: 30x<br>Campo aparente: 40\u00b0 | Campo actual: 1\u00b020&#8242;<br>Otros:<\/p>\n\n\n\n<p>Carta en Uranometr\u00eda 2000.0: 60<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/M31MosaicHaRGB8zenfoliosizecrop2.jpg\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"485\" src=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/M31MosaicHaRGB8zenfoliosizecrop2.jpg?resize=640%2C485\" alt=\"M31\" class=\"wp-image-1917\" srcset=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/M31MosaicHaRGB8zenfoliosizecrop2.jpg?w=1024&amp;ssl=1 1024w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/M31MosaicHaRGB8zenfoliosizecrop2.jpg?resize=300%2C227&amp;ssl=1 300w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/M31MosaicHaRGB8zenfoliosizecrop2.jpg?resize=768%2C582&amp;ssl=1 768w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><figcaption> Hunter Wilson [<a href=\"http:\/\/hwilson.zenfolio.com\/messier\/h2ae83e38#h13fcfd6d\">origen<\/a>] <\/figcaption><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Descripci\u00f3n<\/h3>\n\n\n\n<p><strong>Espa\u00f1ol:<\/strong> Hacer un dibujo que realmente haga justicia a la apariencia telesc\u00f3pica de M31 es pr\u00e1cticamente imposible. De hecho, el presente dibujo lo hice solamente con el prop\u00f3sito de completar el cat\u00e1logo de Messier (y despu\u00e9s de muchos a\u00f1os de estar contemplando este objeto con diferentes intrumentos). Este&nbsp;s\u00f3lo muestra la porci\u00f3n central de M31. De paso, se incluye a M32, que es la peque\u00f1a mancha sobre el lado izquierdo, seg\u00fan la orientaci\u00f3n del dibujo. Por otra parte, opt\u00e9 por no incluir a M110, que quedaba pr\u00f3xima al borde del campo de visi\u00f3n, directamende debajo del centro de M31 (seg\u00fan la orientaci\u00f3n del dibujo, nevamente). NGC 206, una nube de estrellas perteneciente a M31 \u2014que es suficientemente brillante como para tener su propia entrada en el <i>New General Catalogue<\/i>\u2014 quedaba fuera del campo de visi\u00f3n, hacia la izquierda.&nbsp;M31 es m\u00e1s que impresionante: se puede observar a simple vista con facilidad (tiene&nbsp;una magnitud combinada de 3.5, lo que la hace&nbsp;m\u00e1s brillante que la mayor\u00eda de las estrellas que vemos en el cielo), como una nubecilla alargada entre las d\u00e9biles estrellas de la constelaci\u00f3n de Andr\u00f3meda. Debido a su gran tama\u00f1o, s\u00f3lo es posible verla por secciones en cualquier telescopio (excepto aquel que tenga un campo de visi\u00f3n mayor de 3\u00b0). Los binoculares son los mejores instrumentos para apreciarla.&nbsp;Podr\u00eda decirse que s\u00f3lo M42, la Nebulosa de Ori\u00f3n, la supera en belleza, y entre las galaxias, definitivamente es la mejor para observadores del hemisferio norte.&nbsp;En telescopios sobre las 11 y 13 pulgadas de apertura (28 y 33 cm., respectivamente), es posible estudiar algunos de sus c\u00famulos globulares.<\/p>\n\n\n\n<p><strong>English:<\/strong>&nbsp;To do&nbsp;a sketch of M31 that really does justice to its telescopic appearance&nbsp;is virtually impossible. In fact, I did this one solely to&nbsp;complete the Messier Catalogue (and after many years of observing&nbsp;this object with different instruments). The sketch only shows the central area&nbsp;of M31. It also includes M32, which is the small nebulous spot on the left side, according to&nbsp;the sketch&#8217;s orientation. Moreover, I chose not to include M110, which was close to&nbsp;the edge of the field of view, directly&nbsp;below the center of M31 (according to&nbsp;the sketch). NGC 206, a cloud of stars belonging to M31 &#8211;which is bright enough to have its own entry in the New General Catalogue&#8211; was out of the field of view, to the left. M31 is more than impressive: it can be seen easily with the naked eye (it has a combined magnitude of 3.5, making it brighter than most stars we see in the nightsky), as a long puff among the faint stars of Andromeda. Due to its large size, it is only possible to partially see it in most&nbsp;telescopes (except for&nbsp;those that may be able to produce an extra large field of view of at least 3\u00b0). Binoculars are the best instruments to be appreciated M31. It can be argue that&nbsp;only M42, the Orion Nebula, is more beautiful than M31, and among&nbsp;galaxies, it is definitely the best for northern hemisphere observers. With 11 to 13 inch aperture (28 to&nbsp;33 cm., respectively) telescopes, it would be&nbsp;possible to observe&nbsp;some of its globular clusters.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1051\" height=\"1400\" src=\"https:\/\/i1.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg?fit=640%2C852\" alt=\"M31\" class=\"wp-image-1918\" srcset=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg?w=1051&amp;ssl=1 1051w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg?resize=225%2C300&amp;ssl=1 225w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg?resize=769%2C1024&amp;ssl=1 769w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/12\/m031-fsq.jpg?resize=768%2C1023&amp;ssl=1 768w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><figcaption>John Mirtle [<a href=\"http:\/\/www.astrofoto.ca\/john\/m031-106.htm\">origen<\/a>]<\/figcaption><\/figure>\n\n\n\n<p><strong>Cometarios de Messier en 1771:<\/strong> El cielo habiendo estado muy bueno la noche del 3 al 4 de agosto de 1764, y la constelaci\u00f3n de Andr\u00f3meda estando cerca del meridiano, examin\u00e9 &nbsp;atentamente la bella nebulosa de la cintura de Andr\u00f3meda, que fue descubierta en 1612 por Simon Marius, y que ha sido observada desde entonces con cuidado por diferentes astr\u00f3nomos, y en \u00faltimo lugar por M. le Gentil, quien ha dado una descripci\u00f3n bien amplia y detallada en el volumen de las Memorias de la Academia de 1759, <em>p\u00e1gina 453,<\/em> junto con un dibujo de sus apariencias. Solo reportar\u00e9 aqu\u00ed lo que he escrito en mi diario: utilic\u00e9 diferentes instrumentos para examinar esta nebulosa, y sobre todo un excelente telescopio gregoriano de 30 pulgadas de largo focal, el espejo principal teniendo 6 pulgadas de di\u00e1metro y&nbsp;aumentando ciento cuatro&nbsp;veces los objetos: el centro de esta nebulosa parec\u00eda muy claro con este instrumento, sin ninguna&nbsp;apariencia de estrellas; la luz disminuyendo hasta&nbsp;extinguirse; parec\u00eda dos conos o pir\u00e1mides de luz opuestas por su base, y cuyo eje estaba en la direcci\u00f3n de noroeste a sureste; los dos puntos de luz donde las dos cimas estaban m\u00e1s o menos alejado&nbsp;uno del otro de 40 minutos de grado; he dicho <em>m\u00e1s o menos<\/em> a causa de la dificultad&nbsp;para captar&nbsp;los&nbsp;dos extremos. La base com\u00fan de las dos pir\u00e1mides fue de 15 minutos: estas medidas fueron tomadas con un telescopio newtoniano de 4 pies y medio de largo focal, equipado con un micr\u00f3metro de hilo de seda. Con el mismo instrumento compar\u00e9 el&nbsp;centro de la cima de los dos conos de luz con la estrella&nbsp;\u03b3 de Andr\u00f3meda de cuarta magnitud que estaba bastante cerca, y a poca distancia de su paralelo. De estas observaciones, conclu\u00ed la ascenci\u00f3n recta del medio de esta nebulosa en&nbsp;7<span style=\"font-size: 13.3333px; line-height: 20px;\">\u00b0<\/span>&nbsp;26&#8242; 32&#8243;, y su declinaci\u00f3n en&nbsp;39<span style=\"font-size: 13.3333px; line-height: 20px;\">\u00b0<\/span>&nbsp;9&#8242; 32&#8243; boreal. Desde hace quince a\u00f1os que vi y observ\u00e9 esta nebulosa, no not\u00e9 ning\u00fan&nbsp;cambio en sus apariencias; habi\u00e9ndola siempre percibido de la misma forma.<\/p>\n\n\n\n<p><strong>Comentarios de Messier en 1784:<\/strong> La bella nebulosa de la cintura de Andr\u00f3meda, en forma de huso; M. Messier la examin\u00f3 con diferentes instrumentos, y no ha reconocido ninguna&nbsp;estrella: se asemeja a dos conos o pir\u00e1mides de luz opuestas por su base, cuyo eje es en direcci\u00f3n de noroeste a sureste; los dos puntos de luz o las dos cimas est\u00e1n m\u00e1s o menos alejadas una de la otra a 40 minutos de grado; la base com\u00fan de las dos pir\u00e1mides de 15 minutos. Esta nebulosa fue descubierta en 1612 por Simon <em>Marius<\/em> y observada despu\u00e9s por diferentes astr\u00f3nomos. M. le Gentil ha hecho un dibujo en las Memorias de la Academia de 1759, <em>p\u00e1gina 453. <\/em>Est\u00e1 reportada en el<em> Atlas<\/em> ingl\u00e9s.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong>Mapa para localizar a M31<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-style-default\"><a href=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/s031.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"576\" height=\"792\" src=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/s031.png?resize=576%2C792\" alt=\"Mapa para localizar a M31\" class=\"wp-image-846\" srcset=\"https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/s031.png?w=576&amp;ssl=1 576w, https:\/\/i0.wp.com\/www.astronotas.org\/messier\/wp-content\/uploads\/2019\/11\/s031.png?resize=218%2C300&amp;ssl=1 218w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/a><figcaption>Haga click para agrandar.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Objeto: M31 Constelaci\u00f3n: AndromedaFecha: 1994.07.17 | Hora: 06:39 UTLugar: Jauca, Santa Isabel, PR Tipo de objeto: Galaxia espiralNombre: Galaxia de Andr\u00f3meda, NGC 224Magnitud: 3.4 | Tama\u00f1o: 178&#8242; x 63&#8242;A.R. 0h42.7m | Dec. 41\u00b016&#8242;\u00c9poca: 2000.0 Instrumento: Meade MTS-SN 6Ocular: 25 mm.&hellip; <a href=\"https:\/\/www.astronotas.org\/messier\/m31\/\" class=\"more-link\">Continue Reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[133],"tags":[144,150,142,146,143,147,145],"class_list":["post-571","post","type-post","status-publish","format-standard","hentry","category-galaxias","tag-andromeda","tag-galaxia-de-andromeda","tag-m31","tag-m32","tag-messier-31","tag-messier-32","tag-ngc-224"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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