{"id":9859,"date":"2018-11-09T17:29:40","date_gmt":"2018-11-09T17:29:40","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9859"},"modified":"2018-11-21T16:57:35","modified_gmt":"2018-11-21T16:57:35","slug":"lastronome-d-machholz-decouvre-sa-douzieme-comete%e2%80%8f","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/09\/lastronome-d-machholz-decouvre-sa-douzieme-comete%e2%80%8f\/","title":{"rendered":"L’astronome D. Machholz d\u00e9couvre sa douzi\u00e8me com\u00e8te"},"content":{"rendered":"

\u00c0 l’heure de la surveillance automatis\u00e9e du ciel nocturne, l\u2019astronome amateur am\u00e9ricain D. Machholz vient de d\u00e9couvrir visuellement sa douzi\u00e8me com\u00e8te.<\/strong>\u200f<\/p>\n

L’exploit est \u00e0 peine imaginable : alors que le ciel nocturne est depuis quelques ann\u00e9es sous la surveillance constante de r\u00e9seaux de t\u00e9lescopes automatis\u00e9s (comme ceux du\u00a0Catalina Sky Survey<\/a>\u00a0<\/em>install\u00e9s dans les monts Santa Catalina pr\u00e8s de Tucson en Arizona) qui traquent tous les astres en mouvement (com\u00e8tes<\/a> et ast\u00e9ro\u00efdes<\/a>), l’astronome am\u00e9ricain Donald Machholz vient de d\u00e9couvrir visuellement sa douzi\u00e8me com\u00e8te le 7 novembre (de magnitude<\/a> 10) \u00e0 l’aide d’un t\u00e9lescope de 47 centim\u00e8tres de diam\u00e8tre (d\u00e9couverte qu’il partage avec les japonais S. Fujikawa et M. Iwamoto, d’o\u00f9 son nom : C\/2018 V1 Machholz\u2013Fujikawa\u2013Iwamoto).<\/p>\n

\"\"<\/a>
D. Machholz pose ici \u00e0 c\u00f4t\u00e9 d’une paire de jumelles d\u00e9di\u00e9e \u00e0 la recherche de com\u00e8tes.<\/figcaption><\/figure>\n

Ce passionn\u00e9 de com\u00e8tes \u00e2g\u00e9 de 66 ans (que l’on peut suivre sur Twitter<\/a> et Facebook<\/a>) a d\u00e9couvert son premier astre chevelu il y a 40 ans !<\/p>\n

Sa derni\u00e8re trouvaille remontant \u00e0 2010, cet amateur obstin\u00e9 a pass\u00e9 depuis 746 heures \u00e0 scruter le ciel avec diff\u00e9rents instruments avant de faire sa douzi\u00e8me d\u00e9couverte. Sa recette ? Une parfaite connaissance des champs d’\u00e9toiles qu’il balaie inlassablement \u00e0 l’aube ou au cr\u00e9puscule quand le Soleil<\/a> n’est pas tr\u00e8s loin, l\u00e0 o\u00f9 les t\u00e9lescopes automatis\u00e9s ne pointent pas…<\/p>\n

\"\"<\/a>
La com\u00e8te 96\/PMachholz dans le champ du coronographe de la sonde SOHO en 2017.<\/figcaption><\/figure>\n

M\u00eame si les com\u00e8tes d\u00e9nich\u00e9es visuellement par D. Machholz n’ont pas beaucoup marqu\u00e9 les esprits car leur \u00e9clat \u00e9tait modeste, il a notamment rep\u00e9r\u00e9 96P\/Machholz (image ci-dessus, \u00e0 voir\u00a0ici pr\u00e8s du Soleil<\/a> en octobre 2017) trois mois apr\u00e8s le passage de la\u00a0com\u00e8te de Halley<\/a>\u00a0en 1986. Il observait \u00e0 l’\u00e9poque \u00e0 l\u2019aide de la paire de jumelles de 130 mm de diam\u00e8tre que l’on voit \u00e0 ses c\u00f4t\u00e9s.<\/p>\n

Les amoureux du ciel qui se pr\u00e9parent \u00e0 observer le retour de 46P\/Wirtanen la com\u00e8te de l’ann\u00e9e<\/a>, seront sans doute heureux de savoir que les astronomes amateurs<\/a> peuvent encore faire de telles d\u00e9couvertes !<\/p>\n","protected":false},"excerpt":{"rendered":"

\u00c0 l’heure de la surveillance automatis\u00e9e du ciel nocturne, l\u2019astronome amateur am\u00e9ricain D. Machholz vient de d\u00e9couvrir visuellement sa douzi\u00e8me com\u00e8te.\u200f L’exploit est \u00e0 peine imaginable : alors que le ciel nocturne est depuis quelques ann\u00e9es sous la surveillance constante de r\u00e9seaux de t\u00e9lescopes automatis\u00e9s (comme ceux du\u00a0Catalina Sky Survey\u00a0install\u00e9s dans les monts Santa Catalina … Continuer la lecture de L’astronome D. Machholz d\u00e9couvre sa douzi\u00e8me com\u00e8te<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":9860,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2069,2596,93,2346,2595],"class_list":["post-9859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-astronome-amateur","tag-c-2018-v1-machholz-fujikawa-iwamoto","tag-comete","tag-comete-96pmachholz","tag-d-machholz"],"yoast_head":"\nL'astronome D. Machholz d\u00e9couvre sa douzi\u00e8me com\u00e8te<\/title>\n<meta name=\"description\" content=\"\u00c0 l'heure de la surveillance automatis\u00e9e du ciel nocturne, l\u2019astronome amateur am\u00e9ricain D. 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