{"id":14223,"date":"2021-06-07T20:25:02","date_gmt":"2021-06-07T20:25:02","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=14223"},"modified":"2021-06-19T07:20:17","modified_gmt":"2021-06-19T07:20:17","slug":"c-2021-j1-maury-attard-la-comete-francaise-que-lon-nesperait-plus","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/07\/c-2021-j1-maury-attard-la-comete-francaise-que-lon-nesperait-plus\/","title":{"rendered":"C\/2021 J1 Maury-Attard, la com\u00e8te fran\u00e7aise inesp\u00e9r\u00e9e"},"content":{"rendered":"<p><strong>Des astronomes amateurs fran\u00e7ais viennent de d\u00e9couvrir une nouvelle com\u00e8te, C\/2021 J1 Maury-Attard, gr\u00e2ce \u00e0 un proc\u00e9d\u00e9 ing\u00e9nieux.<\/strong><\/p>\n<h5>Grand bonheur pour une lointaine com\u00e8te :<\/h5>\n<p>Ne vous faites aucune illusion : vous ne verrez pas la com\u00e8te C\/2021 J1 Maury-Attard. L&#8217;astre chevelu, de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 19 lors de sa d\u00e9couverte le 9 mai, est incomparablement plus faible que la belle <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/07\/19\/la-comete-neowise-dans-le-parc-naturel-regional-du-morvan\/\" target=\"_blank\" rel=\"noopener\">Neowise<\/a>. Mais ses d\u00e9couvreurs, <a href=\"https:\/\/www.spaceobs.com\/Blog-de-Alain-Maury\" target=\"_blank\" rel=\"noopener\">Alain Maury<\/a> et Georges Attard, sont des astronomes amateurs combl\u00e9s. Le premier a mont\u00e9 son observatoire dans le d\u00e9sert d&#8217;Atacama au Chili. Au milieu d&#8217;une for\u00eat de coupoles qu&#8217;il met \u00e0 la disposition des astronomes, il utilise deux t\u00e9lescopes (bient\u00f4t quatre) pour traquer ast\u00e9ro\u00efdes et com\u00e8tes. Le second prend le relais \u00e0 distance quand il se r\u00e9veille en France et analyse les donn\u00e9es recueillies.<\/p>\n<figure id=\"attachment_14226\" aria-describedby=\"caption-attachment-14226\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2.jpg\" rel=\"lightbox[14223]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-14226\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2-450x295.jpg\" alt=\"\" width=\"450\" height=\"295\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2-450x295.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2-1024x671.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2-768x503.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP2.jpg 1300w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14226\" class=\"wp-caption-text\">Actuellement deux t\u00e9lescopes install\u00e9s au Chili sont impliqu\u00e9s dans le projet MAP de recherche de com\u00e8tes et d&#8217;ast\u00e9ro\u00efdes men\u00e9 par des amateurs. \u00a9 SpaceObs\/MAP<\/figcaption><\/figure>\n<p>Un troisi\u00e8me comp\u00e8re, Daniel Parrott, est l&#8217;auteur du logiciel qui permet de rep\u00e9rer d&#8217;\u00e9ventuels astres mobiles au milieu des \u00e9toiles. \u00c0 eux trois, ils constituent le noyau dur du <a href=\"https:\/\/www.spaceobs.com\/fr\/Blog-de-Alain-Maury\/MAP-historique-et-description\" target=\"_blank\" rel=\"noopener\">projet MAP<\/a>.<!--more--><\/p>\n<h5>MAP fouille le ciel austral :<\/h5>\n<p>MAP (initiales de Maury\/Attard\/Parrott) a pour ambition de d\u00e9nicher des petits corps du Syst\u00e8me solaire dans le ciel austral. Il s&#8217;articule autour de deux (et bient\u00f4t quatre) t\u00e9lescopes \u00e0 grand champ de type RASA (<em>Rowe Ackerman Schmidt Astrograph<\/em>) ayant 28 centim\u00e8tres de diam\u00e8tre pour seulement 62 centim\u00e8tres de distance focale. Des cam\u00e9ras <a href=\"https:\/\/www.futura-sciences.com\/tech\/definitions\/tech-cmos-2442\/\" target=\"_blank\" rel=\"noopener\">CMOS<\/a> install\u00e9es au foyer d\u00e9livrent des images \u00e0 tr\u00e8s grand champ (plus de 3\u00b0 de c\u00f4t\u00e9). Le logiciel <a href=\"https:\/\/www.tycho-tracker.com\/\" target=\"_blank\" rel=\"noopener\">Tycho-Tracker<\/a> con\u00e7u par Daniel Parrott permet de d\u00e9tecter les objets c\u00e9lestes en mouvement en utilisant la technique du suivi synth\u00e9tique.<\/p>\n<p><iframe loading=\"lazy\" title=\"AV7 SpeedRotale\" width=\"474\" height=\"356\" src=\"https:\/\/www.youtube.com\/embed\/KBa3ip31Ccw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Denis Huber, du bureau du <a href=\"https:\/\/www.gapra.fr\/\" target=\"_blank\" rel=\"noopener\">GAPRA<\/a> (association dont sont membres Alain Maury et Georges Attard), nous en dit plus : &#8221; <em>Le suivi synth\u00e9tique consiste \u00e0 additionner les images entre elles avec plusieurs hypoth\u00e8ses de d\u00e9calages dans toutes les directions. Les \u00e9toiles pr\u00e9sentes sur cette image dessinent des train\u00e9es lumineuses. Si au milieu de tout \u00e7a il y a un point qui ne bouge pas, c&#8217;est soit un ast\u00e9ro\u00efde, soit une com\u00e8te ou un satellite<\/em> (voir animation ci-dessus).<em> On r\u00e9colte les donn\u00e9es la nuit au Chili et on les analyse le matin en France. Si n\u00e9cessaire, il est possible de refaire alors une image de confirmation avant que le jour ne se l\u00e8ve au Chili.<\/em> &#8221;<\/p>\n<figure id=\"attachment_14232\" aria-describedby=\"caption-attachment-14232\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3.jpg\" rel=\"lightbox[14223]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14232 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3-450x245.jpg\" alt=\"\" width=\"450\" height=\"245\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3-450x245.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3-1024x558.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3-768x419.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP3.jpg 1224w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14232\" class=\"wp-caption-text\">L&#8217;observatoire d&#8217;Alain Maury au Chili et ses nombreuses coupoles. \u00a9 SpaceObs\/MAP<\/figcaption><\/figure>\n<h5>Faux ast\u00e9ro\u00efde et vraie com\u00e8te :<\/h5>\n<p>Le 9 mai 2021, Alain Maury\u00a0 et Georges Attard d\u00e9couvraient leurs dixi\u00e8me <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-geocroiseur-876\/\" target=\"_blank\" rel=\"noopener\">ast\u00e9ro\u00efde g\u00e9ocroiseur<\/a>, 1581K01. Sur les images de confirmation, ils ont remarqu\u00e9 que l&#8217;astre en question \u00e9tait entour\u00e9 d&#8217;un faible halo, une coma ou chevelure. Les instances astronomiques ont confirm\u00e9 quelques jours plus tard la nature com\u00e9taire de l&#8217;objet en question. Et le 2 juin, la com\u00e8te a \u00e9t\u00e9 officiellement baptis\u00e9e C\/2021 J1 Maury-Attard.<\/p>\n<figure id=\"attachment_14231\" aria-describedby=\"caption-attachment-14231\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP4.jpg\" rel=\"lightbox[14223]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-14231 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP4-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP4-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/06\/MAP4.jpg 640w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-14231\" class=\"wp-caption-text\">Lorsqu&#8217;il sera pleinement op\u00e9rationnel, le projet MAP comprendra quatre t\u00e9lescopes \u00e0 grand champ charg\u00e9s de traquer ast\u00e9ro\u00efdes et com\u00e8tes. \u00a9 SpaceObs\/MAP<\/figcaption><\/figure>\n<p>Comme a tenu \u00e0 le pr\u00e9ciser Alain Maury : &#8221; <em>C&#8217;est la premi\u00e8re com\u00e8te d\u00e9couverte en utilisant la technique du suivi synth\u00e9tique, mise au point par le <a href=\"https:\/\/science.jpl.nasa.gov\/people\/Shao\/\" target=\"_blank\" rel=\"noopener\">Dr Michael Shao<\/a> et son \u00e9quipe au JPL et que nous utilisons gr\u00e2ce au programme Tycho-Tracker d\u00e9velopp\u00e9 par Daniel Parrott, avec l&#8217;aide et la complicit\u00e9 de Joaquin Fabrega (<\/em>ce dernier met \u00e0 disposition son t\u00e9lescope au Chili pour des images de confirmation<em>)<\/em>. &#8221;<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/05\/7p-pons-winnecke-la-comete-franco-allemande-est-de-retour\/\" target=\"_blank\" rel=\"noopener\">7P\/Pons-Winnecke, la com\u00e8te franco-allemande, est de retour<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/23\/interview-michel-ory-astronome-amateur-et-chasseur-de-cometes\/\" target=\"_blank\" rel=\"noopener\">Interview : Michel Ory, chasseur de com\u00e8tes (et d\u2019ast\u00e9ro\u00efdes)<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/01\/13\/la-comete-c-2021-a1-leonard-sannonce-prometteuse\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Leonard va-t-elle tenir ses promesses en 2021 ?<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur <a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>Des astronomes amateurs fran\u00e7ais viennent de d\u00e9couvrir une nouvelle com\u00e8te, C\/2021 J1 Maury-Attard, gr\u00e2ce \u00e0 un proc\u00e9d\u00e9 ing\u00e9nieux. Grand bonheur pour une lointaine com\u00e8te : Ne vous faites aucune illusion : vous ne verrez pas la com\u00e8te C\/2021 J1 Maury-Attard. L&#8217;astre chevelu, de magnitude 19 lors de sa d\u00e9couverte le 9 mai, est incomparablement plus &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/06\/07\/c-2021-j1-maury-attard-la-comete-francaise-que-lon-nesperait-plus\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">C\/2021 J1 Maury-Attard, la com\u00e8te fran\u00e7aise inesp\u00e9r\u00e9e<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":14226,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[87],"tags":[3049,3046,93,3047,3048],"class_list":["post-14223","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-les-hommes-et-le-ciel","tag-alain-maury","tag-c-2021-j1-maury-attard","tag-comete","tag-daniel-parott","tag-georges-attard"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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