{"id":8194,"date":"2019-03-30T11:22:35","date_gmt":"2019-03-30T10:22:35","guid":{"rendered":"http:\/\/outters.fr\/?p=8194"},"modified":"2025-07-15T17:04:08","modified_gmt":"2025-07-15T16:04:08","slug":"cg4-lhargb-ciel-austral","status":"publish","type":"post","link":"https:\/\/www.outters.fr\/?p=8194","title":{"rendered":"CG4-LHargb (Ciel Austral)"},"content":{"rendered":"

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CG4 molecular en LHa-rgb
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Donn\u00e9es techniques
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Donn\u00e9es scientifiques<\/h2><\/div>
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SOURCE WIKIPEDIA<\/p>\n

CG 4<\/b>, commonly referred to as God’s Hand<\/b>,[3]<\/a><\/sup> is a star-forming region<\/a> located in the Puppis<\/a> constellation, about 1,300 light-years (400\u00a0pc) from Earth.[4]<\/a><\/sup> It is one of several objects referred to as \u00ab\u00a0cometary globules<\/a>\u00ab\u00a0, because its shape is similar to that of a comet<\/a>.[1]<\/a><\/sup> It has a dense head formed of gas and dust,[1]<\/a><\/sup> which is around 1.5\u00a0ly (0.46\u00a0pc) in diameter,[3]<\/a><\/sup> and an elongated faint tail[1]<\/a><\/sup> around 8\u00a0ly (2.5\u00a0pc) in length.[3]<\/a><\/sup><\/p>\n

CG 4<\/span>, and the nearby cometary globules, generally point away from the Vela Supernova Remnant<\/a>, located at the center of the Gum Nebula<\/a>.[5]<\/a><\/sup><\/p>\n

Discovery<\/span><\/h2>\n

In 1976, photographs from the UK Schmidt Telescope<\/a>\u2014operated by the Australian Astronomical Observatory<\/a>\u2014showed several objects resembling comets, located in the Gum Nebula<\/a>,[1]<\/a><\/sup> an emission nebula<\/a> of the constellation. Due to their particular shape, these objects came to be known as cometary globules.[1]<\/a><\/sup> Each globule has a dense, dark, ruptured head and a very long tail, with the latter pointing away from the Vela Supernova Remnant<\/a>. As a part of the ESO Cosmic Gems program, the European Southern Observatory<\/a> released an image of CG 4<\/span> in January 2015 showing the head of the nebula.[1]<\/a><\/sup><\/p>\n

Structure<\/span><\/h2>\n

The head of cometary globule CG 4<\/span> resembles a comet with a dusty cavernous mouth, as photographed by the European Southern Observatory’s Very Large Telescope<\/a> in 2015.[6]<\/a><\/sup> Composed of relatively dense, dark matter, it is an opaque structure that is being illuminated by the glow of a nearby star.[7]<\/a><\/sup> An obscure red glow limbing the globule is possibly caused by emission from ionized hydrogen. The mouth of the globule appears to be ready to consume the edge-on spiral galaxy ESO 257-19<\/span>. In reality, the galaxy is over a hundred million light-years further away from the globule.[4]<\/a><\/sup><\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Observation data: J2000<\/a> epoch<\/a><\/th>\n<\/tr>\n
Right ascension<\/a><\/th>\n\u00a007h<\/sup>\u00a034m<\/sup>\u00a009.0s<\/sup>[2]<\/a><\/sup><\/td>\n<\/tr>\n
Declination<\/a><\/th>\n\u221246\u00b0\u00a054\u2032\u00a018\u2033[2]<\/a><\/sup><\/td>\n<\/tr>\n
Distance<\/th>\n1,300\u00a0ly<\/a>\u00a0\u00a0\u00a0(400\u00a0pc<\/a>)<\/td>\n<\/tr>\n
Constellation<\/a><\/th>\nPuppis<\/a><\/td>\n<\/tr>\n
Physical characteristics<\/th>\n<\/tr>\n
Dimensions<\/th>\n1.5\u00a0\u00d7\u00a08\u00a0ly (0.46\u00a0\u00d7\u00a02.45\u00a0pc)<\/td>\n<\/tr>\n
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Designations<\/th>\nBHR 21<\/span>, DCld 259.4-12.7<\/span>, FEST 2-30<\/span>, Sandqvist 103<\/span><\/td>\n<\/tr>\n
See also: Lists of nebulae<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div><\/div>
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Commentaires sur l'objet<\/h2><\/div>
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Objet mythique que l’on a pris le temps de faire avec 5 filtres. La Halpha apporte un plus non n\u00e9gligeable \u00e0 l’image.<\/p>\n

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Image Lrgb<\/h2><\/a><\/div><\/div><\/div>
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Version Halpha<\/h2><\/a><\/div>
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Your Content Goes Here<\/p>\n<\/div><\/div><\/div>

<\/div><\/div><\/div><\/div><\/div><\/div><\/p>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":7747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"footnotes":""},"categories":[129,152,335,378,96,102,125],"tags":[338,377],"class_list":["post-8194","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-observatoire-chili","category-toutes-categories","category-odk500","category-saison-2019","category-galaxie","category-nebuleuse","category-l-rvb-ha-oiii","tag-cielaustral","tag-cg4-molecular","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/8194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=8194"}],"version-history":[{"count":3,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/8194\/revisions"}],"predecessor-version":[{"id":8201,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/posts\/8194\/revisions\/8201"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=\/wp\/v2\/media\/7747"}],"wp:attachment":[{"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=8194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=8194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.outters.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=8194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}