{"id":237,"date":"2023-09-03T13:15:51","date_gmt":"2023-09-03T11:15:51","guid":{"rendered":"https:\/\/martin-in.space\/?p=237"},"modified":"2023-09-22T21:58:52","modified_gmt":"2023-09-22T19:58:52","slug":"ngc-6888-the-crescent-nebula","status":"publish","type":"post","link":"https:\/\/martin-in.space\/index.php\/2023\/09\/03\/ngc-6888-the-crescent-nebula\/","title":{"rendered":"NGC 6888 (The Crescent Nebula)"},"content":{"rendered":"\n

Hmlovina NGC 6888 je emisn\u00e1 hmlovina nach\u00e1dzaj\u00faca sa v s\u00fahvezd\u00ed Labu\u0165. Je od n\u00e1s vzdialen\u00e1 pribli\u017ene 5000 sveteln\u00fdch rokov aj je ve\u013ekos\u0165 je pribli\u017ene 25 sveteln\u00fdch rokov. Bola objaven\u00e1 Williamom Herschelom v roku 1792. V strede hmloviny sa nach\u00e1dza Wolf-Raytova<\/a> hviezda, ktorej r\u00fdchle hviezdne vetry vytl\u00e1\u010daj\u00fa plyn a prach, ktor\u00fd sa n\u00e1sledne zr\u00e1\u017ea s pomalej\u0161ou ob\u00e1lkou, ktor\u00e1 bola vyvrhnut\u00e1 pred asi 250 000 rokmi. Hviezda v strede m\u00e1 ozna\u010denie WR 136.<\/p>\n\n\n\n\n\n\n\n

Plyn je tvoren\u00fd at\u00f3mami vod\u00edka a kysl\u00edka, presnej\u0161ie ionizovan\u00fdm vod\u00edkom Halpha a ionizovan\u00fdm kysl\u00edkom OIII. Preto na viz\u00e1len pozorovanie sa odpor\u00fa\u010da pou\u017ei\u0165 filter OIII, ktor\u00fd zv\u00fdrazn\u00ed \u0161truktur\u00fa hmloviny.<\/p>\n\n\n\n

Fotografovanie<\/h1>\n\n\n\n

Hmlovina je dostupn\u00e1 na fotografovanie aj men\u0161\u00edmi \u010falekoh\u013eadmi, v mojom pr\u00edpade SkyWatcher Evostar 80 ED. Ke\u010f\u017ee hmlovina \u017eiari v \u010diarach ioniozvan\u00e9ho vod\u00edka a kysl\u00edka, je vhodn\u00e9 pou\u017ei\u0165 \u00fazkopasmov\u00e9 filtre, napr. nejak\u00fd dualband, ktor\u00fd prep\u00fa\u0161\u0165a \u010diary vod\u00edka a kysl\u00edka.<\/p>\n\n\n\n

RGB<\/h2>\n\n\n\n

Na fotenie som pou\u017eil farebnu (OSC – one shot color) kameru. Prv\u00fd pokus teda bol najprv fotenie \u010disto v RGB s t\u00fdm, \u017ee som jednu noc venoval aj foteniu cez dualband filter. Chcel som t\u00fdm zv\u00fdrazni\u0165 plynn\u00fa ob\u00e1lku. V\u00fdsledok si mo\u017eno prezrie\u0165 ni\u017e\u0161ie:<\/p>\n\n\n\n

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NGC 6888 HaRGB<\/figcaption><\/figure>\n\n\n\n

Viac \u00fadajov je na linke: https:\/\/astrob.in\/2yb7ru\/0\/<\/a>.<\/p>\n\n\n\n

Dualband (\u010diara ionizovan\u00e9ho vod\u00edka a kysl\u00edka)<\/h2>\n\n\n\n

Po pokuse spomenut\u00e9ho vy\u0161\u0161ie sa mi v\u00fdsledok pr\u00edli\u017e nepozd\u00e1val. Tak som sk\u00fasil nafoti\u0165 hmlovinu ce dualband filter, ke\u010f\u017ee ako bolo spomenut\u00e9, hmlovina najviac \u017eiari v \u010diare ionizovah\u00e9 vod\u00edka. V\u00fdsledok tohoto postupu sa mi pozd\u00e1va lep\u0161\u00ed, vidno viac detailov.<\/p>\n\n\n\n

\"\"
NGC 6888 cez dualband filter<\/figcaption><\/figure>\n\n\n\n

Ako vidno, tak na tejto sn\u00edmke vidno detailnej\u0161ie aj okolit\u00e9 oblaky prachu a plynu. Ku sn\u00edmku som u\u017e len pridal hviezdy z RGB, ke\u010f\u017ee s\u00fa kraj\u0161ie a v\u00fdraznej\u0161ie.<\/p>\n\n\n\n

Viac info o tomto sn\u00edmku mo\u017eno zisti\u0165 z linku: https:\/\/astrob.in\/6xbk5l\/0\/<\/a>.<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Hmlovina NGC 6888 je emisn\u00e1 hmlovina nach\u00e1dzaj\u00faca sa v s\u00fahvezd\u00ed Labu\u0165. Je od n\u00e1s vzdialen\u00e1 pribli\u017ene 5000 sveteln\u00fdch rokov aj je ve\u013ekos\u0165 je pribli\u017ene 25 sveteln\u00fdch rokov. Bola objaven\u00e1 Williamom Herschelom v roku 1792. V strede hmloviny sa nach\u00e1dza Wolf-Raytova … Pokra\u010dova\u0165 v \u010d\u00edtan\u00ed →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":242,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10,14],"tags":[],"class_list":["post-237","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-astrofoto","category-hmloviny"],"_links":{"self":[{"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/posts\/237","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/comments?post=237"}],"version-history":[{"count":3,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/posts\/237\/revisions"}],"predecessor-version":[{"id":243,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/posts\/237\/revisions\/243"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/media\/242"}],"wp:attachment":[{"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/media?parent=237"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/categories?post=237"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/martin-in.space\/index.php\/wp-json\/wp\/v2\/tags?post=237"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}