{"id":22303,"date":"2026-01-18T19:15:24","date_gmt":"2026-01-18T19:15:24","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=22303"},"modified":"2026-02-03T17:36:04","modified_gmt":"2026-02-03T17:36:04","slug":"6ac4721-une-comete-decouverte-par-des-amateurs","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/01\/18\/6ac4721-une-comete-decouverte-par-des-amateurs\/","title":{"rendered":"6AC4721, une com\u00e8te d\u00e9couverte par des amateurs"},"content":{"rendered":"<p><strong>Une \u00e9quipe d&#8217;amateurs vient de d\u00e9couvrir une nouvelle com\u00e8te, 6AC4721. Elle pourrait\u00a0 nous offrir un joli spectacle au printemps.<\/strong><\/p>\n<h5>Travail d&#8217;\u00e9quipe :<\/h5>\n<p>De toute \u00e9vidence, la d\u00e9couverte de 6AC4721 [nom d\u00e9finitif <strong>C\/2026 A1 (MAPS)<\/strong>] ne doit rien au hasard. C&#8217;est en effet la huiti\u00e8me <a href=\"https:\/\/cnes.fr\/dossiers\/cometes\" target=\"_blank\" rel=\"noopener\">com\u00e8te<\/a> \u00e0 mettre au cr\u00e9dit du programme MAPS. Sans parler des <a href=\"https:\/\/cnes.fr\/dossiers\/asteroides\" target=\"_blank\" rel=\"noopener\">ast\u00e9ro\u00efdes<\/a> : plus d&#8217;une centaine en 2025, de quoi faire r\u00eaver bien des professionnels. Mais qui sont donc les quatre mousquetaires de MAPS (initiales de Maury, Attard, Parrott et Signoret), tous amateurs ? <a href=\"https:\/\/www.spaceobs.com\/Blog-de-Alain-Maury\" target=\"_blank\" rel=\"noopener\">Alain Maury<\/a> a mont\u00e9 son observatoire (<a href=\"https:\/\/www.spaceobs.com\/fr\" target=\"_blank\" rel=\"noopener\">SpaceObs<\/a>) dans le d\u00e9sert d\u2019Atacama au Chili, o\u00f9 il accueille les amoureux des \u00e9toiles. Pendant qu&#8217;il leur fait admirer les beaut\u00e9s du ciel nocturne austral, quatre <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Chambre_de_Schmidt\" target=\"_blank\" rel=\"noopener\">t\u00e9lescopes de Schmidt<\/a> de 28 centim\u00e8tres de diam\u00e8tre (f\/2,2) enti\u00e8rement automatis\u00e9s traquent ast\u00e9ro\u00efdes et com\u00e8tes :<\/p>\n<figure id=\"attachment_22315\" aria-describedby=\"caption-attachment-22315\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/maps.jpg\" rel=\"lightbox[22303]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-22315\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/maps-450x338.jpg\" alt=\"\" width=\"450\" height=\"338\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/maps-450x338.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/maps-768x576.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/maps.jpg 800w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-22315\" class=\"wp-caption-text\">Les quatre t\u00e9lescopes qui servent \u00e0 d\u00e9tecter com\u00e8tes et ast\u00e9ro\u00efdes. \u00a9 SpaceObs\/MAPS<\/figcaption><\/figure>\n<p>Lorsqu&#8217;Alain va se coucher, <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Georges_Attard\" target=\"_blank\" rel=\"noopener\">Georges Attard<\/a> et <a href=\"https:\/\/www.astrosignoret.fr\/\" target=\"_blank\" rel=\"noopener\">Florian Signoret<\/a> (tous trois sont membres du <a href=\"https:\/\/www.gapra.fr\/\" target=\"_blank\" rel=\"noopener\">GAPRA<\/a>) prennent le relais quand ils se r\u00e9veillent en France. Informaticiens, ils ont d\u00e9velopp\u00e9 des programmes pour optimiser la recherche de nouveaux corps c\u00e9lestes sur les images astronomiques. Tout comme <a href=\"http:\/\/www.skaw.sk\/interview-with-daniel-parrott.html\" target=\"_blank\" rel=\"noopener\">Daniel Parrott<\/a>, auteur du logiciel <a href=\"https:\/\/www.tycho-tracker.com\/\" target=\"_blank\" rel=\"noopener\">Tycho Tracker<\/a>.<!--more--><\/p>\n<h5>Prometteuse com\u00e8te :<\/h5>\n<p>Le 13 janvier, la nuit est belle au Chili. Comme il le raconte sur <a href=\"https:\/\/www.spaceobs.com\/fr\/Blog-de-Alain-Maury\/Comete-MAPS\" target=\"_blank\" rel=\"noopener\">son blog<\/a>, Alain Maury en fait profiter un couple d&#8217;astronomes amateurs am\u00e9ricains. Puis, avant d&#8217;aller se coucher, il jette un coup d&#8217;\u0153il aux images enregistr\u00e9es cette nuit-l\u00e0. Le logiciel a d\u00e9tect\u00e9 un objet inconnu non r\u00e9pertori\u00e9, entour\u00e9 d&#8217;un faible halo. Il s&#8217;agit bien d&#8217;une com\u00e8te, la huiti\u00e8me d\u00e9couverte par l&#8217;\u00e9quipe. Elle se trouve alors dans la petite <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Colombe_(constellation)\" target=\"_blank\" rel=\"noopener\">constellation australe de la Colombe<\/a>, et sa <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> est de 17,8. Trois jours plus tard, l&#8217;astre chevelu, photographi\u00e9 par <a href=\"https:\/\/www.facebook.com\/photo?fbid=2328770577639761&amp;set=pcb.1666582504703259\" target=\"_blank\" rel=\"noopener\">Michael J\u00e4ger et Gerald Rhemann<\/a>, a d\u00e9j\u00e0 gagn\u00e9 en luminosit\u00e9 :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet.jpg\" rel=\"lightbox[22303]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-22304\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2026\/01\/comet.jpg 1201w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Cette com\u00e8te fait partie du <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Groupe_de_Kreutz\" target=\"_blank\" rel=\"noopener\">groupe de Kreutz<\/a>, un ensemble de petits astres chevelus (restes de la dislocation probable d\u2019une com\u00e8te g\u00e9ante au XIIe si\u00e8cle) qui s\u2019aventurent r\u00e9guli\u00e8rement \u00e0 proximit\u00e9 du <a href=\"https:\/\/cnes.fr\/dossiers\/soleil\" target=\"_blank\" rel=\"noopener\">Soleil<\/a>. Ce groupe compte quelques membres c\u00e9l\u00e8bres, comme par exemple <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/12\/21\/c2011-w3-lovejoy-letonnante-comete-de-decembre-2011\/\" target=\"_blank\" rel=\"noopener\">C\/2011 W3 Lovejoy<\/a>, et surtout <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-comete-ikeya-seki-6216\/\" target=\"_blank\" rel=\"noopener\">C\/1965 S1 (Ikeya-Seki)<\/a>. Que dire alors de 6AC4721 ? Les optimistes pronostiqueront une tr\u00e8s belle surprise fin mars au cr\u00e9puscule (la com\u00e8te sera au <a href=\"https:\/\/fr.wikipedia.org\/wiki\/P%C3%A9rih%C3%A9lie\" target=\"_blank\" rel=\"noopener\">p\u00e9rih\u00e9lie<\/a> le 4 avril). Les r\u00e9alistes leur rappelleront que de nombreux astres chevelus se sont d\u00e9sint\u00e9gr\u00e9s par le pass\u00e9 en s&#8217;approchant du Soleil. Quoi qu&#8217;il en soit, cette com\u00e8te est \u00e0 surveiller !<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/06\/26\/la-comete-13p-olbers-revient-nous-rendre-visite\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te 13P\/Olbers revient nous rendre visite<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/12\/la-comete-12p-pons-brooks-devoile-ses-charmes\/\" target=\"_blank\" rel=\"noopener\">12P\/Pons-Brooks nous d\u00e9voile ses charmes<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/09\/02\/la-comete-nishimura-assaillie-par-le-vent-solaire\/\" target=\"_blank\" rel=\"noopener\">La com\u00e8te Nishimura assaillie par le vent solaire<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/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>Une \u00e9quipe d&#8217;amateurs vient de d\u00e9couvrir une nouvelle com\u00e8te, 6AC4721. Elle pourrait\u00a0 nous offrir un joli spectacle au printemps. Travail d&#8217;\u00e9quipe : De toute \u00e9vidence, la d\u00e9couverte de 6AC4721 [nom d\u00e9finitif C\/2026 A1 (MAPS)] ne doit rien au hasard. C&#8217;est en effet la huiti\u00e8me com\u00e8te \u00e0 mettre au cr\u00e9dit du programme MAPS. Sans parler des &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2026\/01\/18\/6ac4721-une-comete-decouverte-par-des-amateurs\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">6AC4721, une com\u00e8te d\u00e9couverte par des amateurs<\/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":22304,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[3907,3049,3908,93,3904,3903,3906,3048,869,3905],"class_list":["post-22303","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-6ac4721","tag-alain-maury","tag-c-2026-a1-maps","tag-comete","tag-daniel-parrott","tag-florian-signoret","tag-gapra","tag-georges-attard","tag-groupe-de-kreutz","tag-maps"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>6AC4721, une com\u00e8te d\u00e9couverte par des amateurs<\/title>\n<meta name=\"description\" content=\"Une \u00e9quipe d&#039;amateurs vient de d\u00e9couvrir une nouvelle com\u00e8te, 6AC4721. 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