{"id":205192,"date":"2020-10-09T12:47:45","date_gmt":"2020-10-09T11:47:45","guid":{"rendered":"http:\/\/zakrasnejsivimperk.cz\/?p=205192"},"modified":"2021-08-06T15:25:30","modified_gmt":"2021-08-06T14:25:30","slug":"ceska-astronomicka-spolecnost-titul-ceska-astrofotografie-mesice-za-zari-2020-ziskal-snimek-lbn468-temna-a-reflexni-mlhovina-v-cefeovi-jehoz-autorem-je-tomas-zabransky","status":"publish","type":"post","link":"https:\/\/zakrasnejsivimperk.cz\/?p=205192","title":{"rendered":"\u010cESK\u00c1 ASTRONOMICK\u00c1 SPOLE\u010cNOST: Titul \u010cesk\u00e1 astrofotografie m\u011bs\u00edce za z\u00e1\u0159\u00ed 2020 z\u00edskal sn\u00edmek LBN468 – temn\u00e1 a reflexn\u00ed mlhovina v Cefeovi, jeho\u017e autorem je Tom\u00e1\u0161 Z\u00e1bransk\u00fd"},"content":{"rendered":"
Na na\u0161\u00ed obloze je n\u011bkolik souhv\u011bzd\u00ed, kter\u00e1 nikdy nezapadaj\u00ed. Jsou tak bl\u00edzko nebesk\u00e9ho p\u00f3lu, \u017ee se ani p\u0159i nejv\u011bt\u0161\u00ed snaze b\u011bhem ot\u00e1\u010den\u00ed Zem\u011b prost\u011b pod obzor nedostanou. N\u011bkter\u00e1 jsou zn\u00e1m\u00e1, jako nap\u0159\u00edklad Mal\u00fd medv\u011bd \u010di Velk\u00e1 medv\u011bdice nebo Kasiopeia. Ta jsou ostatn\u011b t\u00e9m\u011b\u0159 nep\u0159ehl\u00e9dnuteln\u00e1, bohat\u00e1 na hv\u011bzdy a jasn\u00e9 galaxie, hv\u011bzdokupy \u010di mlhoviny. Souhv\u011bzd\u00ed Cefea, kter\u00e9 tak\u00e9 pat\u0159\u00ed mezi tato takzvan\u00e1 cirkumpol\u00e1rn\u00ed souhv\u011bzd\u00ed, je \u00fapln\u011b jin\u00e9. Chud\u00e9 na hv\u011bzdy i objekty vzd\u00e1len\u00e9ho vesm\u00edru vypl\u0148uje prostor mezi Mal\u00fdm medv\u011bdem, Drakem, Labut\u00ed, Je\u0161t\u011brkou, Kasiopeiou a \u017dirafou. Kupodivu jej znali ji\u017e ve star\u00e9m \u0158ecku, nebo\u0165 se o n\u011bm zmi\u0148uje astronom Ptolemaios.<\/h6>\n

\"\"Toto souhv\u011bzd\u00ed p\u0159edstavuj\u00edc\u00ed kr\u00e1le b\u00e1jn\u00e9 Etiopie, otce Andromedy, m\u00e1 ov\u0161em p\u0159eci jen alespo\u0148 dv\u011b zaj\u00edmavosti. Jeho nejjasn\u011bj\u0161\u00ed hv\u011bzda Alderamin, b\u00edl\u00fd podobr o jasnosti 2,2 mag, vzd\u00e1len\u00fd 49 sv\u011bteln\u00fdch let a 17 kr\u00e1t sv\u00edtiv\u011bj\u0161\u00ed ne\u017e Slunce, bude pro na\u0161i Zemi za p\u0159ibli\u017en\u011b 7500 let velmi d\u016fle\u017eitou hv\u011bzdou. Vlivem precese nebo-li k\u00fdvav\u00e9mu pohybu zemsk\u00e9 osy bude v t\u00e9 dob\u011b zemsk\u00e1 osa m\u00ed\u0159it pr\u00e1v\u011b k t\u00e9to hv\u011bzd\u011b a ta bude na\u0161im vzd\u00e1len\u00fdm potomk\u016fm slou\u017eit jako pol\u00e1rka. Ostatn\u011b, stavitel\u00e9 egyptsk\u00fdch pyramid se p\u0159ed 5 tis\u00edci lety jako pol\u00e1rkou \u0159\u00eddili hv\u011bzdnou Thuban v souhv\u011bzd\u00ed Draka.<\/p>\n

Druh\u00fdm zaj\u00edmav\u00fdm faktem o souhv\u011bzd\u00ed jsou rozs\u00e1hl\u00e9 komplexy temn\u00fdch mlhovin, kter\u00e9 se v posledn\u00edch letech, s rozvojem pozorovac\u00ed a zpracovatelsk\u00e9 techniky, staly v\u00edtan\u00fdm c\u00edlem astrofotograf\u016f. Jedn\u00edm z nich je i autor tohoto sn\u00edmku Tom\u00e1\u0161 Z\u00e1bransk\u00fd. Ten jej nejen vyfotografoval, ale zaslal jej do sout\u011b\u017ee \u010cesk\u00e1 astrofotografie m\u011bs\u00edce, kterou za\u0161ti\u0165uje \u010cesk\u00e1 astronomick\u00e1 spole\u010dnost. A v z\u00e1\u0159ijov\u00e9m kole porota vybrala tento LBN468 – temn\u00e1 a reflexn\u00ed mlhovina v Cefeovi jako sn\u00edmek v\u00edt\u011bzn\u00fd.<\/p>\n

Ozna\u010den\u00ed LBN poch\u00e1z\u00ed ze jm\u00e9na Lynds\u00b4Catalogue of Bright Nebulae a p\u0159edstavuje jeden z astronomick\u00fdch katalog\u016f jasn\u00fdch mlhovin. P\u016fvodn\u011b byl vytvo\u0159en v roce 1960 a ze stejn\u00e9 autorsk\u00e9 d\u00edlny poch\u00e1z\u00ed i katalog LDN (Lynds’ Catalogue of Dark Nebulae), zahrnuj\u00edc\u00ed mlhoviny temn\u00e9.<\/p>\n

To \u017ee se jedn\u00e1 o oblast velmi dynamickou, m\u016f\u017eeme usoudit ji\u017e ze samotn\u00e9ho sn\u00edmku temn\u00e9 mlhoviny, kde se hust\u00e9 oblasti mezihv\u011bzdn\u00e9ho prachu a plynu p\u0159ekr\u00fdvaj\u00ed s reflexn\u00edmi mlhovinami. Ned\u00edv\u00e1me se toti\u017e na mrtvou oblast, ale na aktivn\u00ed oblast, kde vznikaj\u00ed nov\u00e9 hv\u011bzdy. Pokud se pozorn\u011b pod\u00edv\u00e1me na horn\u00ed \u010d\u00e1st reflexn\u00ed mlhoviny, nem\u016f\u017ee na\u0161\u00ed pozornosti uniknout n\u00e1padn\u00e1 drobounk\u00e1 temn\u00e1 mlhovina, na jej\u00edm\u017e konci se nach\u00e1z\u00ed slab\u00e1 prom\u011bnn\u00e1 hv\u011bzda PV Cep. U t\u00e9to hv\u011bzdy se nach\u00e1z\u00ed drobn\u00e1 bipol\u00e1rn\u00ed mlhovina, kter\u00e1 byla objevena teprve v roce 1977 a je zn\u00e1ma tak\u00e9 pod ozna\u010den\u00edm “Gyulbudaghianova” mlhovina. Hnac\u00edm motorem t\u00e9to mlhoviny je r\u00e1zov\u00e1 vlna z jet\u016f generovan\u00fdch smr\u0161\u0165uj\u00edc\u00ed se protohv\u011bzdou PV Cep v jej\u00edm centru. D\u00edky t\u00e9to interakci m\u011bn\u00ed mlhovina viditeln\u011b sv\u016fj tvar a je proto st\u0159edem pozornosti astrofyzik\u016f. Pohledem na tuto prom\u011bnnou hv\u011bzdu m\u00e1me jedine\u010dnou mo\u017enost sledovat prom\u011bnu mezihv\u011bzdn\u00e9 hmoty v hv\u011bzdu – okam\u017eiky hv\u011bzdn\u00e9ho stvo\u0159en\u00ed v tak\u0159\u00edkaj\u00edc p\u0159\u00edm\u00e9m p\u0159enosu.<\/p>\n

Mnoho m\u00edsta nezb\u00fdv\u00e1, a tak je\u0161t\u011b pod\u011bkujme nejen za porotce sout\u011b\u017ee \u010cAM, nejen za \u010ceskou astronomickou spole\u010dnost, ale snad i za ostatn\u00ed astronomy a milovn\u00edky kr\u00e1sna. Tento obr\u00e1zek by se jist\u011b vyj\u00edmal na mnoh\u00fdch v\u00fdstav\u00e1ch abstraktn\u00edho um\u011bn\u00ed. A pop\u0159ejme autorovi mnoho podobn\u00fdch sn\u00edmk\u016f, kter\u00e9 budeme s \u00fa\u017easem sledovat, stejn\u011b tak, jak \u010din\u00ed do hn\u011bdav\u00e9 mlhoviny p\u0159evt\u011blen\u00e1 busta mu\u017ee s udiven\u00fdm v\u00fdrazem ve tv\u00e1\u0159i a jasnou hv\u011bzdou m\u00edsto n\u00e1u\u0161nice v uchu.<\/p>\n

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\"\"<\/p>\n

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Autor:<\/strong> Tom\u00e1\u0161 Z\u00e1bransk\u00fd<\/p>\n

N\u00e1zev:<\/strong> LBN468 – temn\u00e1 a reflexn\u00ed mlhovina v Cefeovi<\/p>\n

M\u00edsto:<\/strong> \u017dehrovn\u00edk<\/p>\n

Datum:<\/strong> 21. 9. 2020<\/p>\n

Sn\u00edma\u010d:<\/strong> Modifikovan\u00fd Canon 6D<\/p>\n

Optika:<\/strong> TS-Optics APO PhotoLine 102\/714mm f\/7 FPL53 + TS-Optics 3” Photoline 0.79x reduktor, f\/5.53, ohnisko 564mm<\/p>\n

Mont\u00e1\u017e:<\/strong> EQ-6 SkyScan<\/p>\n

Popis:<\/strong> 413 expozic v d\u00e9lce 5 min. V\u00fdsledn\u00fd hrub\u00fd sn\u00edmek byl nejprve slo\u017een v programu DeepSkyStacker a pot\u00e9 postupn\u011b zpracov\u00e1v\u00e1n ve Photoshopu. Vyrovn\u00e1n\u00ed pozad\u00ed a fin\u00e1ln\u00ed barevn\u00e9 korekce byly provedeny v Pixinsight\\<\/p>\n

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V\u00edt\u011bzn\u00e9 sn\u00edmky v jednotliv\u00fdch m\u011bs\u00edc\u00edch a dal\u0161\u00ed informace si m\u016f\u017eete prohl\u00e9dnout na http:\/\/www.astro.cz\/cam\/.<\/strong><\/a><\/p>\n

Za porotu \u010cAM Marcel B\u011bl\u00edk, Hv\u011bzd\u00e1rna v \u00dapici<\/strong><\/p>\n

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