[{"@context":"https:\/\/schema.org\/","@type":"Article","@id":"https:\/\/www.mistrkancl.cz\/posledni-rozlouceni-pred-srazkou\/#Article","mainEntityOfPage":"https:\/\/www.mistrkancl.cz\/posledni-rozlouceni-pred-srazkou\/","headline":"Posledn\u00ed rozlou\u010den\u00ed p\u0159ed sr\u00e1\u017ekou","name":"Posledn\u00ed rozlou\u010den\u00ed p\u0159ed sr\u00e1\u017ekou","description":"Rossetaputovala vesm\u00edrem p\u0159es 12 let a svou pou\u0165 zakon\u010dila pl\u00e1novan\u00fd n\u00e1razem do komety \u010curjumov-Gerasimenko z v\u00fd\u0161ky 15,4 km v p\u00e1tek 30. 9. 2016. T\u011bsn\u011b p\u0159ed dopadem po\u0159\u00eddila zat\u00edm nezn\u00e1m\u00fd sn\u00edmek povrchu komety. Sond\u011b se poda\u0159ilo po\u0159\u00eddit \u0159adu fotografi\u00ed povrchu planety za pomoci kamery OSIRIS. Rozm\u011bln\u011bn\u00e1 data fotografi\u00ed zas\u00edlala na zemi v jednotliv\u00fdch datov\u00fdch paketech z d\u016fvod\u016f telemetrie. Spr\u00e1vu dat […]","datePublished":"2017-08-11","dateModified":"2023-05-09","author":{"@type":"Person","@id":"https:\/\/www.mistrkancl.cz\/author\/#Person","name":"","url":"https:\/\/www.mistrkancl.cz\/author\/","identifier":1,"image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/baa231f7e1963b29d6549eb0e137b049d877d4e97c51386f463c7d4fc98329bd?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/baa231f7e1963b29d6549eb0e137b049d877d4e97c51386f463c7d4fc98329bd?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"mistrkancl.cz","logo":{"@type":"ImageObject","@id":"\/logo.png","url":"\/logo.png","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/www.mistrkancl.cz\/wp-content\/uploads\/img_a297076_w2370_t1507741687.jpg","url":"https:\/\/www.mistrkancl.cz\/wp-content\/uploads\/img_a297076_w2370_t1507741687.jpg","height":0,"width":0},"url":"https:\/\/www.mistrkancl.cz\/posledni-rozlouceni-pred-srazkou\/","about":["Zbo\u017e\u00ed"],"wordCount":428,"articleBody":"Rossetaputovala vesm\u00edrem p\u0159es 12 let a svou pou\u0165 zakon\u010dila pl\u00e1novan\u00fd n\u00e1razem do komety \u010curjumov-Gerasimenko z v\u00fd\u0161ky 15,4 km v p\u00e1tek 30. 9. 2016. T\u011bsn\u011b p\u0159ed dopadem po\u0159\u00eddila zat\u00edm nezn\u00e1m\u00fd sn\u00edmek povrchu komety.Sond\u011b se poda\u0159ilo po\u0159\u00eddit \u0159adu fotografi\u00ed povrchu planety za pomoci kamery OSIRIS. Rozm\u011bln\u011bn\u00e1 data fotografi\u00ed zas\u00edlala na zemi v jednotliv\u00fdch datov\u00fdch paketech z d\u016fvod\u016f telemetrie. Spr\u00e1vu dat mn\u011bli na starosti v\u011bde\u010dt\u00ed pracovn\u00edci z Institutu Maxe Plancka v G\u00f6ttingenu. Teprve pozd\u011bji Holger Sierks, zodpov\u011bdn\u00fd za v\u00fdstupy z kamery OSIRIS, objevil n\u011bkolik dal\u0161\u00edch datov\u00fdch paket\u016f, o jej\u00ed\u017e existenci nem\u011bli v\u011bdci tu\u0161en\u00ed.Tato data obsahovala \u010d\u00e1st fotografie, kterou software k automatick\u00e9 identifikaci sn\u00edmk\u016f prvotn\u011b chybn\u011b vyhodnotil. P\u0159i odesl\u00e1n\u00ed t\u011bsn\u011b p\u0159ed n\u00e1razem se nepoda\u0159ilo fotografii odeslat kompletn\u00ed sn\u00edmek (23 048 byt\u016f) byl rozlo\u017een do \u0161esti paket\u016f, ze kter\u00fdch \u00fasp\u011b\u0161n\u011b dorazily jen t\u0159i pot\u00e9 se sonda rozt\u0159\u00ed\u0161tila o povrch komety.   Po mraven\u010d\u00ed tak\u0159ka restaur\u00e1torsk\u00e9 pr\u00e1ci v\u011bdc\u016f se poda\u0159ilo ru\u010dn\u011b z\u00edskat 12 228 byt\u016f, co\u017e je skoro polovina p\u016fvodn\u00ed fotografie d\u00edky \u010demu\u017e bylo mo\u017en\u00e9 sn\u00edmek zrekonstruovat. Palubn\u00ed syst\u00e9m sondy kv\u016fli zp\u016fsobu datov\u00e9 komprese nezas\u00edl\u00e1 data pixel od pixelu, ale po vrstv\u00e1ch. Co\u017e umo\u017enuje odes\u00edlat podstatn\u011b detailn\u011bj\u0161\u00ed fotografie.Nakonec se poda\u0159ilo z\u00edskat 53% dat, co\u017e neznamen\u00e1, \u017ee sch\u00e1z\u00ed polovina sn\u00edmku, ale jen rozost\u0159en\u00ed a sn\u00ed\u017een\u00ed kvality sn\u00edmku. Na m\u00edsto komprese v pom\u011bru 1:20, v\u011bdci dos\u00e1hli kompresn\u00edho pom\u011bru 1:38, co\u017e obr\u00e1zek rozost\u0159ilo a vytratili se n\u011bkter\u00e9 detaily.\t\tPosledn\u00ed sn\u00edmekPochopiteln\u011b to souvis\u00ed s technick\u00fdmi parametry kamery OSIRIS, kter\u00e1 nen\u00ed konstruov\u00e1na pro po\u0159izov\u00e1n\u00ed sn\u00edmk\u016f z bezprost\u0159edn\u00ed bl\u00edzkosti. V\u011bdci zkusili vy\u0159adit barevn\u00fd filtr, \u010d\u00edm\u017e se poda\u0159ilo kameru „p\u0159eost\u0159it“ na bl\u00edzko. P\u016fvodn\u00ed domn\u011bl\u00e9 sn\u00edmky po\u0159\u00edzen\u00e9 sondou byli z v\u00fd\u0161ky 23,3 a\u017e 26,2 metr\u016f nad povrchem komety. Posledn\u00ed nov\u011b objeven\u00fd sn\u00edmek je z v\u00fd\u0161ky 17,9 a\u017e 21 metr\u016f o rozm\u011brech jeden kr\u00e1t jeden metr. Vzd\u00e1lenosti jsou uv\u00e1d\u011bny z\u00e1m\u011brn\u011b v rozsahu p\u00e1r metr\u016f, jeliko\u017e si odborn\u00edci nejsou jisti spr\u00e1vnosti v\u00fdpo\u010dtu za pou\u017eit\u00ed modelu a tvaru komety.                                                                                                                                                                                                                                                                                                                                                                                        4.1\/5 - (15 votes)        "},{"@context":"https:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Posledn\u00ed rozlou\u010den\u00ed p\u0159ed sr\u00e1\u017ekou","item":"https:\/\/www.mistrkancl.cz\/posledni-rozlouceni-pred-srazkou\/#breadcrumbitem"}]}]