{"id":25044,"date":"2026-02-25T12:00:00","date_gmt":"2026-02-25T12:00:00","guid":{"rendered":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/politique\/comete-3i-atlas-ejecte-cocktail-organique-inattendu"},"modified":"2026-02-26T02:51:52","modified_gmt":"2026-02-26T02:51:52","slug":"comete-3i-atlas-ejecte-cocktail-organique-inattendu","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/sao-tome-e-principe\/toutes-les-actualites\/comete-3i-atlas-ejecte-cocktail-organique-inattendu","title":{"rendered":"Com\u00e8te 3I\/Atlas \u00c9jecte Cocktail Organique Inattendu"},"content":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. <\/strong><\/span>Des hydrocarbures mais aussi des alcools. Ces familles de mole\u0301cules \u2013 et probablement bien d\u2019autres encore \u2013 sont pre\u0301sentes dans la come\u0300te 3I\/Atlas, objet ce\u0301leste forme\u0301 autour d\u2019une autre e\u0301toile que le Soleil qui traverse actuellement notre Syste\u0300me solaire apre\u0300s avoir voyage\u0301 pendant plusieurs milliards d\u2019anne\u0301es dans l\u2019espace. C\u2019est seulement le troisie\u0300me objet interstellaire identifie\u0301 a\u0300 ce jour, apre\u0300s 1I\/\u2019Oumuamua en 2017 et 2I\/Borisov en 2019. Et la premie\u0300re fois que les scientifiques de\u0301tectent des mole\u0301cules organiques au sein de ces fascinants visiteurs, gra\u0302ce a\u0300 l\u2019armada de te\u0301lescopes et de sondes spatiales qui scrutent 3I\/Atlas depuis plusieurs mois.<\/p>\n

Come\u0300te e\u0301teinte<\/b><\/p>\n

Repe\u0301re\u0301 alors qu\u2019il s\u2019e\u0301loignait de\u0301ja\u0300 du Soleil, 1I\/\u2019Oumuamua ressemblait a\u0300 une sorte de come\u0300te e\u0301teinte, sans e\u0301mission gazeuse de\u0301tectable, et n\u2019a pu e\u0302tre observe\u0301 qu\u2019une vingtaine de jours. Quasiment aucune information n\u2019a pu e\u0302tre ainsi recueillie sur la composition chimique de l\u2019instrus et ce faisant sur son syste\u0300me stellaire d\u2019origine. Les configurations e\u0301taient beaucoup plus favorables avec 2I\/Borisov. De\u0301tecte\u0301 avant le pe\u0301rihe\u0301lie (point de l\u2019orbite ou\u0300 l\u2019objet est au plus proche du Soleil), il pre\u0301sentait une activite\u0301 come\u0301taire bien marque\u0301e avec son nuage de poussie\u0300res et de gaz de plus en plus important a\u0300 mesure que les glaces se re\u0301chauffaient et se sublimaient. En analysant pendant pre\u0300s de dix mois la lumie\u0300re e\u0301mise par le halo come\u0301taire, les scientifiques de\u0301tecteront ainsi du carbone diatomique, du monoxyde de carbone, du cyanoge\u0300ne et de la vapeur d\u2019eau.<\/p>\n

Une varie\u0301te\u0301 de substances<\/b><\/p>\n

Identifie\u0301 le 1er juillet 2025 par le re\u0301seau de te\u0301lescopes ATLAS alors qu\u2019il se trouvait a\u0300 proximite\u0301 de Jupiter et filait a\u0300 toute trombe (246 000 km\/h) vers le Syste\u0300me solaire interne, le troisie\u0300me spe\u0301cimen est encore plus inte\u0301ressant pour les astronomes. Il libe\u0300re tellement de poussie\u0300res et de gaz que le noyau come\u0301taire \u2013 qui mesurerait plusieurs kilome\u0300tres de large, bien plus que 1I\/\u2019Oumuamua et 2I\/Borisov \u2013 n\u2019a toujours pas e\u0301te\u0301 visualise\u0301. En deux mois d\u2019analyses, les experts avaient de\u0301ja\u0300 collecte\u0301 davantage d\u2019informations qu\u2019apre\u0300s un an d\u2019observations de 2I\/Borisov \u2013 gra\u0302ce aussi, faut-il souligner, au te\u0301lescope spatial James Webb de la Nasa qui n\u2019existait pas a\u0300 l\u2019e\u0301poque. Une varie\u0301te\u0301 de substantes ont e\u0301te\u0301 ainsi rapidement identifie\u0301es: eau gazeuse et solide, monoxyde et dioxyde de carbone, sulfure de carbonyle, acide cyanhydrique, du cyanoge\u0300ne ainsi que du nickel et du fer.<\/p>\n

De l\u2019autre co\u0302te\u0301 du Soleil<\/b><\/p>\n

Les mesures ont cependant e\u0301te\u0301 interrompues vers la fin du mois de septembre, 3I\/Atlas passant he\u0301las de l\u2019autre co\u0302te\u0301 du Soleil par rapport a\u0300 la Terre \u2013 notamment lors du pe\u0301rihe\u0301lie le 29 octobre ou\u0300 les de\u0301gazages sont particulie\u0300rement intenses. Mais a\u0300 partir de fin novembre, une panoplie d\u2019instruments ont pu observer a\u0300 nouveau 3I\/Atlas qui avait commence\u0301 a\u0300 s\u2019e\u0301loigner du Soleil pour ne jamais y revenir. C\u2019est le cas, en particulier, du te\u0301lescope James Webb qui a pointe\u0301 ses yeux surpuissants les 15, 16 et 27 de\u0301cembre vers la come\u0300te interstellaire alors qu\u2019elle se trouvait a\u0300 quelque 350 millions de kilome\u0300tres de notre e\u0301toile.<\/p>\n

Premie\u0300re de\u0301tection de me\u0301thane<\/b><\/p>\n

Gra\u0302ce au de\u0301tecteur MIRI conc\u0327u en partie par l\u2019Agence spatiale europe\u0301enne, il a permis ainsi \u00ab la premie\u0300re de\u0301tection de me\u0301thane dans un objet interstellaire \u00bb, annoncent des astronomes de l\u2019Institut de technologie de Californie (Etats-Unis). Ils pre\u0301cisent que cette mole\u0301cule organique apparait plus tardivement que l\u2019eau dans les processus de de\u0301gazage, sugge\u0301rant \u00ab un appauvrissement en me\u0301thane des couches superficielles \u00bb de la come\u0300te, sa surface ayant e\u0301te\u0301 probablement alte\u0301re\u0301e par les rayonnements cosmiques du milieu interstellaire. Le rapport entre la quantite\u0301 de me\u0301thane et d\u2019eau est par ailleurs le\u0301ge\u0300rement enrichi au regard de la plupart des come\u0300tes du Syste\u0300me solaire, sugge\u0301rant que 3I\/Atlas se serait forme\u0301e dans une re\u0301gion tre\u0300s froide riche en glaces carbone\u0301es.<\/p>\n

Une activite\u0301 de\u0301multiplie\u0301e<\/b><\/p>\n

Un autre instrument de pointe confirme ce re\u0301sultat et apporte des informations ine\u0301dites: le te\u0301lescope spatial SPHEREx lance\u0301 en mars 2025, qui re\u0301alise une cartographie spectroscopique comple\u0300te du ciel (e\u0301toiles, poussie\u0300res interstellaires…) tous les six mois environ dans l\u2019infrarouge, mais peut examiner aussi des cibles opportunes a\u0300 l\u2019inte\u0301rieur du Syste\u0300me solaire comme 3I\/Atlas. En aou\u0302t 2025, alors que la come\u0300te e\u0301tait encore e\u0301loigne\u0301e du Soleil entre Jupiter et Mars, il n\u2019avait de\u0301tecte\u0301 que la vapeur d\u2019eau et du monoxyde de carbone ainsi que d\u2019importantes e\u0301missions de gaz carbonique. Mais les mesures re\u0301alise\u0301es par SPHEREx du 8 au 15 de\u0301cembre montrent a\u0300 quel point l\u2019activite\u0301 come\u0301taire s\u2019est depuis intensifie\u0301e: la quantite\u0301 de vapeur d\u2019eau a e\u0301te\u0301 multiplie\u0301e par 40 et de dioxyde de carbone par 80 ! `<\/p>\n

Chimie pre\u0301biotique<\/b><\/p>\n

\u00ab Maintenant que l\u2019e\u0301nergie du Soleil a eu le temps de pe\u0301ne\u0301trer profonde\u0301ment dans la come\u0300te, les glaces intactes enfouies sous la surface se re\u0301chauffent et entrent en e\u0301ruption, libe\u0301rant un cocktail de substances chimiques qui n\u2019avaient pas e\u0301te\u0301 expose\u0301es a\u0300 l\u2019espace depuis plusieurs milliards d\u2019anne\u0301es \u00bb, explique le cosmologiste Phil Korngut du Caltech, un des auteurs de l\u2019e\u0301tude. La signature spectrale caracte\u0301ristique des compose\u0301s organiques apparait ainsi tre\u0300s clairement dans les nouvelles mesures de SPHEREx. Me\u0302me si ces donne\u0301es ne permettent pas encore de distinguer les diffe\u0301rentes substances, elles correspondent manifestement a\u0300 des hydrocarbures (me\u0301thane, e\u0301thane, etc.), des alcools (notamment le me\u0301thanol) ou au formalde\u0301hyde \u2013 mole\u0301cules qui permettent de fabriquer des assemblages plus complexes tels des acides amine\u0301s et ont du\u0302 jouer un ro\u0302le central sur Terre dans la chimie pre\u0301biotique. \u00ab Sur notre plane\u0300te, les mole\u0301cules organiques constituent la base des processus biologiques me\u0302me si elles peuvent e\u0302tre fabrique\u0301es par des phe\u0301nome\u0300nes qui n\u2019impliquent pas la vie \u00bb, rele\u0300ve la Nasa.<\/p>\n

Pour plus d’informations et d’analyses sur la S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – S\u00e3o Tom\u00e9 e Pr\u00edncipe. Des hydrocarbures mais aussi des alcools. Ces familles de mole\u0301cules \u2013 et probablement bien d\u2019autres encore \u2013 sont pre\u0301sentes dans la come\u0300te 3I\/Atlas, objet ce\u0301leste forme\u0301 autour d\u2019une autre e\u0301toile que le Soleil qui traverse actuellement notre Syste\u0300me solaire apre\u0300s avoir voyage\u0301 pendant plusieurs milliards d\u2019anne\u0301es dans l\u2019espace. C\u2019est […]<\/p>\n","protected":false},"author":82,"featured_media":25043,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[56],"class_list":["post-25044","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-sao-tome-e-principe"],"yoast_head":"\nCom\u00e8te 3I\/Atlas \u00c9jecte Cocktail Organique Inattendu - S\u00e3o Tom\u00e9 e Pr\u00edncipe<\/title>\n<meta name=\"description\" content=\"Des hydrocarbures mais aussi des alcools. 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