{"id":246920,"date":"2021-09-20T11:35:00","date_gmt":"2021-09-20T10:35:00","guid":{"rendered":"https:\/\/www.unistellar.com\/blog\/a-fall-tour-of-the-universe-with-unistellar\/"},"modified":"2022-11-29T23:06:20","modified_gmt":"2022-11-29T22:06:20","slug":"une-visite-automnale-de-lunivers-avec-unistellar","status":"publish","type":"blog","link":"https:\/\/www.unistellar.com\/fr\/blog\/une-visite-automnale-de-lunivers-avec-unistellar\/","title":{"rendered":"Une visite automnale de l’univers avec Unistellar"},"content":{"rendered":"

[et_pb_section fb_built=\u00a0\u00bb1″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bbgcid-579abc80-458a-43b5-90b5-efa821d39207″ custom_padding=\u00a0\u00bb4px||0px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{%22gcid-579abc80-458a-43b5-90b5-efa821d39207%22:%91%22background_color%22%93}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][dsm_breadcrumbs _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/dsm_breadcrumbs][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=\u00a0\u00bb1″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb background_color=\u00a0\u00bbgcid-579abc80-458a-43b5-90b5-efa821d39207″ custom_margin=\u00a0\u00bb||-24px|||\u00a0\u00bb custom_padding=\u00a0\u00bb1px||6px|||\u00a0\u00bb global_colors_info=\u00a0\u00bb{%22gcid-579abc80-458a-43b5-90b5-efa821d39207%22:%91%22background_color%22%93}\u00a0\u00bb][et_pb_row _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_text _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb]<\/p>\n

C\u2019est bient\u00f4t l\u2019automne dans l\u2019h\u00e9misph\u00e8re nord, et nous avons d\u00e9j\u00e0 pr\u00e9vu de partir \u00e0 la recherche de nos objets c\u00e9lestes pr\u00e9f\u00e9r\u00e9s pour cette saison. D\u00e9couvrez le top 10 des cibles c\u00e9lestes d\u2019Unistellar : galaxies, n\u00e9buleuses, plan\u00e8tes, pluies de m\u00e9t\u00e9ores, constellations, ast\u00e9ro\u00efdes, etc.<\/span><\/p>\n

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Une paire d\u2019amas d\u2019\u00e9toiles formant le Double Amas, NGC 869 et NGC 884, assembl\u00e9s par l\u2019utilisateur d\u2019Unistellar eVscope David Rowe (Royaume-Uni).<\/em><\/p>\n

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Constellation de Pers\u00e9e<\/h2>\n

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Le h\u00e9ros grec Pers\u00e9e est visible pendant toute la saison automnale de l\u2019h\u00e9misph\u00e8re nord. La constellation abrite l\u2019\u00e9toile du d\u00e9mon, ou Algol, et un certain nombre d\u2019objets vifs du ciel profond, tels que le double amas et la petite n\u00e9buleuse de l\u2019halt\u00e8re. Elle est \u00e9galement \u00e0 l\u2019origine de\u00a0<\/span>la c\u00e9l\u00e8bre pluie de m\u00e9t\u00e9ores des Pers\u00e9ides<\/a>, qui a atteint son apog\u00e9e en ao\u00fbt.<\/p>\n

\u00ab Le double amas de Pers\u00e9e\u2026 une beaut\u00e9 du ciel bor\u00e9al, m\u00eame si Messier l\u2019a rat\u00e9 ! \u00bb.\u00a0<\/span><\/i>\u2013 David Rowe<\/p>\n

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Galaxie d\u2019Androm\u00e8de et ses compagnons galactiques assembl\u00e9s par l\u2019utilisateur d\u2019Unistellar eVscope Romain Girard (Suisse)<\/p>\n

<\/em><\/p>\n

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Galaxie d\u2019Androm\u00e8de<\/h2>\n

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Le voisin le plus proche de la Voie lact\u00e9e,\u00a0<\/span>Androm\u00e8de<\/a>, \u00e9galement connu sous le nom de Messier 31, se trouve \u00e0 seulement 2,5 millions d\u2019ann\u00e9es-lumi\u00e8re. De m\u00eame masse que la Voie lact\u00e9e, Androm\u00e8de contient pr\u00e8s de deux fois plus d\u2019\u00e9toiles. Elle est plus visible en automne et en hiver dans l\u2019h\u00e9misph\u00e8re nord, atteignant son point culminant vers minuit en octobre. Dans l\u2019h\u00e9misph\u00e8re sud, la meilleure p\u00e9riode pour l\u2019observer est le mois de novembre.<\/p>\n

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La Lune (\u00e0 gauche) et V\u00e9nus (\u00e0 droite) dans le ciel nocturne<\/p>\n

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V\u00e9nus<\/h2>\n

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V\u00e9nus est le deuxi\u00e8me objet le plus lumineux du ciel nocturne, apr\u00e8s la Lune. La plan\u00e8te la plus chaude de notre syst\u00e8me solaire, V\u00e9nus est couverte de nuages d\u2019acide sulfurique qui obscurcissent sa surface. L\u2019ann\u00e9e derni\u00e8re, la d\u00e9couverte d\u2019un gaz connu sous le nom de phosphine dans l\u2019atmosph\u00e8re de V\u00e9nus a suscit\u00e9 un int\u00e9r\u00eat scientifique accru pour notre \u00ab plan\u00e8te s\u0153ur \u00bb. Bien qu\u2019il n\u2019existe aucune preuve directe de vie sur V\u00e9nus, la NASA et l\u2019ESA ont r\u00e9cemment s\u00e9lectionn\u00e9 de nouvelles missions spatiales robotis\u00e9es qui nous permettront d\u2019en apprendre davantage sur ce monde intriguant. \u00c0 la mi-septembre, V\u00e9nus sera visible juste apr\u00e8s le cr\u00e9puscule, et sera tr\u00e8s brillante en novembre. Observez cette brillante plan\u00e8te \u00e0 l\u2019\u0153il nu, avec des jumelles ou un t\u00e9lescope.<\/p>\n

[\/et_pb_text][et_pb_image src=\u00a0\u00bbhttps:\/\/www.unistellar.com\/wp-content\/uploads\/2022\/11\/helix-nebula-tateki-goto-600×600-1.jpeg\u00a0\u00bb title_text=\u00a0\u00bbhelix-nebula-tateki-goto-600×600″ align=\u00a0\u00bbcenter\u00a0\u00bb _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_text_color=\u00a0\u00bb#B3B3B3″ hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]<\/p>\n

La n\u00e9buleuse Helix captur\u00e9e par l\u2019utilisateur d\u2019Unistellar eVscope \u5f8c\u85e4\u5e72\u57ce Tateki Goto (Japon)
\n<\/em><\/p>\n

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N\u00e9buleuse de l\u2019h\u00e9lice (NGC 7293)<\/h2>\n

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La n\u00e9buleuse Helix se trouve \u00e0 650 ann\u00e9es-lumi\u00e8re, ce qui fait d\u2019elle la n\u00e9buleuse la plus proche de nous. Elle donne un aper\u00e7u de l\u2019avenir de notre Soleil, rejetant du plasma chaud \u00e0 mesure qu\u2019il se d\u00e9sint\u00e8gre en une minuscule \u00e9toile naine blanche. Le rayonnement infrarouge intense de la naine blanche \u00e9claire les gaz qui s\u2019\u00e9chappent, formant un anneau frappant. Utilisez des jumelles ou un t\u00e9lescope afin d\u2019observer le nuage brumeux de la n\u00e9buleuse Helix dans la\u00a0<\/span>constellation de l\u2019Aquarius<\/a>. Vous pouvez profiter de cette n\u00e9buleuse vibrante pendant toute la dur\u00e9e de l\u2019automne \u00e0 partir de l\u2019h\u00e9misph\u00e8re nord.<\/p>\n

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La n\u00e9buleuse du voile occidental, dans la constellation du Cygne, captur\u00e9e par l\u2019utilisateur du eVscope d\u2019Unistellar, Chuck Brown (USA).<\/span><\/p>\n

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Constellation du Cygne<\/h2>\n

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Le\u00a0<\/span>cygne<\/a>\u00a0<\/span>abrite l\u2019ast\u00e9risme de la Croix du Nord, ainsi que Deneb, l\u2019une des \u00e9toiles les plus brillantes du ciel nocturne. Dans l\u2019h\u00e9misph\u00e8re nord, elle est visible \u00e0 l\u2019\u0153il nu \u2013 notamment ses six \u00e9toiles les plus brillantes \u2013 pendant toute la saison automnale.<\/p>\n

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Le grand amas de P\u00e9gase captur\u00e9 par Scott Kardel (USA), utilisateur de l\u2019 eVscope d\u2019Unistellar.<\/p>\n

<\/em><\/p>\n

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Grand amas de P\u00e9gase (Messier 15)<\/h2>\n

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Cet amas globulaire plac\u00e9 au sein de P\u00e9gase se trouve \u00e0 33 600 ann\u00e9es-lumi\u00e8re de distance et a un diam\u00e8tre de 175 ann\u00e9es-lumi\u00e8re. Par temps clair, il est visible \u00e0 l\u2019\u0153il nu, un t\u00e9lescope permettant de voir les \u00e9toiles individuelles. P\u00e9gase est visible pendant tout l\u2019automne \u00e0 travers l\u2019h\u00e9misph\u00e8re nord.<\/p>\n

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\u00ab De juin \u00e0 ao\u00fbt, le ciel est rempli d\u2019amas d\u2019\u00e9toiles globulaires, mais \u00e0 l\u2019approche de l\u2019automne, ils se font rares, ce qui fait de M15 mon amas globulaire pr\u00e9f\u00e9r\u00e9 pour l\u2019automne. Les preuves recueillies \u00e0 l\u2019aide du t\u00e9lescope spatial Hubble sugg\u00e8rent qu\u2019un trou noir d\u2019une masse 4 000 fois sup\u00e9rieure \u00e0 celle du Soleil se cache en son noyau. \u00bb<\/i>\u00a0<\/span>\u2013 Scott Kardel<\/p>\n

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Observez les ast\u00e9ro\u00efdes troyens Polymele et Eurybates<\/h2>\n

 <\/p>\n

Ces deux ast\u00e9ro\u00efdes sont des Trojans, ce qui signifie qu\u2019ils partagent l\u2019orbite de Jupiter. En octobre prochain, vous pourrez assister au lancement par la NASA de la mission\u00a0<\/span>Lucy<\/a>, destin\u00e9e \u00e0 \u00e9tudier les trojans, et rejoindre la communaut\u00e9 Unistellar pour les observer les 20 et 23 octobre. Apprenez-en plus sur les\u00a0<\/span>occultations d\u2019ast\u00e9ro\u00efdes<\/a>\u00a0<\/span>et comment participer aux programmes de\u00a0<\/span>science participative d\u2019Unistellar sur les ast\u00e9ro\u00efdes<\/a>!<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/www.unistellar.com\/wp-content\/uploads\/2022\/11\/orionids-meteor-shower-600×357-1.jpeg\u00a0\u00bb title_text=\u00a0\u00bborionids-meteor-shower-600×357″ align=\u00a0\u00bbcenter\u00a0\u00bb _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]<\/p>\n

La pluie de m\u00e9t\u00e9ores des Orionides<\/h2>\n

 <\/p>\n

La com\u00e8te de Halley passe tous les 75 ans, mais la Terre se d\u00e9place chaque ann\u00e9e \u00e0 travers la tra\u00een\u00e9e de d\u00e9bris qu\u2019elle laisse derri\u00e8re elle, entra\u00eenant la pluie de m\u00e9t\u00e9ores des Orionides. Ces m\u00e9t\u00e9ores semblent provenir de la constellation d\u2019Orion et durent environ une semaine, avec un pic d\u2019observation les 20 et 21 octobre.<\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_column type=\u00a0\u00bb4_4″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][et_pb_image src=\u00a0\u00bbhttps:\/\/www.unistellar.com\/wp-content\/uploads\/2022\/11\/iris-nebula-jon-burton-600×600-1.jpeg\u00a0\u00bb title_text=\u00a0\u00bbiris-nebula-jon-burton-600×600″ align=\u00a0\u00bbcenter\u00a0\u00bb _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_image][et_pb_text _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb text_text_color=\u00a0\u00bb#B3B3B3″ hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]<\/p>\n

La n\u00e9buleuse de l\u2019Iris, pr\u00e9sente au sein de la constellation du C\u00e9ph\u00e9e, captur\u00e9e par l\u2019utilisateur de l\u2019eVscope d\u2019Unistellar, Jon Burton (Royaume-Uni).
\n<\/em><\/p>\n

[\/et_pb_text][et_pb_text _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb hover_enabled=\u00a0\u00bb0″ global_colors_info=\u00a0\u00bb{}\u00a0\u00bb sticky_enabled=\u00a0\u00bb0″]<\/p>\n

Constellation de C\u00e9ph\u00e9e<\/h2>\n

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C\u00e9ph\u00e9e, p\u00e8re d\u2019Androm\u00e8de, abrite sept \u00e9toiles principales dont Alpha Cephei, deux galaxies spirales, un amas ouvert et deux n\u00e9buleuses. La constellation abrite \u00e9galement le quasar hyperlumineux S5 0014+81, aliment\u00e9 par un trou noir supermassif 10 000 fois plus grand que celui situ\u00e9 au centre de notre galaxie. C\u00e9ph\u00e9e est plus visible au mois de novembre dans l\u2019h\u00e9misph\u00e8re nord.<\/p>\n

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Eclipse lunaire partielle vue \u00e0 Mannheim, Allemagne (2019)
\n<\/em><\/p>\n

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Eclipse lunaire partielle<\/h2>\n

 <\/p>\n

Le 19 novembre, les personnes situ\u00e9es en Am\u00e9rique du Nord, ainsi que dans certaines parties de l\u2019Europe, de l\u2019Asie, de l\u2019Australie et de l\u2019Am\u00e9rique du Sud, pourront observer une \u00e9clipse lunaire partielle, lorsque la Lune passera \u00e0 travers l\u2019ombre de la Terre, avec un pic vers 6 heures UTC.<\/p>\n

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Bonus : Science citoyenne des exoplan\u00e8tes<\/h2>\n

 <\/p>\n

Les citoyens scientifiques d\u2019Europe, d\u2019Am\u00e9rique du Nord et du Japon pourront en septembre participer \u00e0 la confirmation de l\u2019existence d\u2019une\u00a0<\/span>exoplan\u00e8te<\/a>, une plan\u00e8te situ\u00e9e au-del\u00e0 de notre syst\u00e8me solaire. TOI (TESS Object of Interest) 2121.01, est une exoplan\u00e8te candidate pour le Transiting Exoplanet Survey Satellite (TESS), la mission actuelle de recherche d\u2019exoplan\u00e8tes de la NASA. TOI 2121.01 pr\u00e9sente une masse environ 7 fois sup\u00e9rieure \u00e0 celle de Jupiter et tourne autour d\u2019une petite \u00e9toile naine K, froide et de couleur orange, tous les 2,3 jours. D\u00e9couvrez comment participer \u00e0 la\u00a0<\/span>science citoyenne des exoplan\u00e8tes unistellaires<\/a>.<\/p>\n

 <\/p>\n

Pour plus de plaisir \u00e0 observer l\u2019automne,\u00a0<\/span>cr\u00e9ez votre propre carte des \u00e9toiles<\/a>, personnalis\u00e9e en fonction de votre date, heure et lieu. Et continuez \u00e0 consulter le blog\u00a0<\/span>Unistellar<\/a>\u00a0<\/span>pour d\u00e9couvrir d\u2019autres merveilles du ciel.<\/p>\n

 <\/p>\n

Clear skies!\u00a0<\/i><\/p>\n

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Further readings<\/h2>\n

[\/et_pb_text][et_pb_divider color=\u00a0\u00bb#FDB82B\u00a0\u00bb _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb width=\u00a0\u00bb15%\u00a0\u00bb global_colors_info=\u00a0\u00bb{}\u00a0\u00bb][\/et_pb_divider][dsm_post_carousel post_type=\u00a0\u00bbblog\u00a0\u00bb posts_number=\u00a0\u00bb6″ pagi_color=\u00a0\u00bb#FDB82B\u00a0\u00bb pagi_active_color=\u00a0\u00bb#FDB82B\u00a0\u00bb navi_color=\u00a0\u00bb#FDB82B\u00a0\u00bb post_item_bg_color=\u00a0\u00bbgcid-84086a3f-4df3-4dea-91c2-75d1b92f5c80″ _builder_version=\u00a0\u00bb4.18.0″ _module_preset=\u00a0\u00bbdefault\u00a0\u00bb global_colors_info=\u00a0\u00bb{%22gcid-84086a3f-4df3-4dea-91c2-75d1b92f5c80%22:%91%22post_item_bg_color%22%93}\u00a0\u00bb][\/dsm_post_carousel][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"

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