{"id":3744,"date":"2024-05-26T10:20:34","date_gmt":"2024-05-26T08:20:34","guid":{"rendered":"http:\/\/www.astrobobo.net\/?p=3744"},"modified":"2024-05-26T13:08:57","modified_gmt":"2024-05-26T11:08:57","slug":"tranzit-issa-24-5-2024","status":"publish","type":"post","link":"https:\/\/www.astrobobo.net\/?p=3744","title":{"rendered":"Tranzit ISSa, 24..5.2024."},"content":{"rendered":"<p>Zanimljiva situacija mi se dogodila u petak, 24.5.2024., prilikom poku\u0161aja snimanja preleta ISS-a (Me\u0111unarodne svemirske postaje). Naime, nedavno sam otkrio odli\u010dan program <a href=\"https:\/\/www.heavenscape.com\/\" target=\"_blank\" rel=\"noopener\">SkyTrack<\/a> koji mo\u017ee upravljati nekim astronomskim monta\u017eama tako da kontinuirano prati prelet satelita u zemljinoj orbiti. Probao sam ga svega dva puta do sada, a u petak je bila odli\u010dna prilika jer je ISS prolazio skoro to\u010dno preko zenita, \u0161to zna\u010di da nas je dijelila najmanja udaljenost. <span class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u x1yc453h\" dir=\"auto\">S obzirom da postaja orbitira na visini 400 km ako prolazi dalje od zenita prema horizontu, stvarna udaljenost mo\u017ee biti i vi\u0161e od 1000 km.<\/span><\/p>\n<p>Nadao sam se uhvatiti neke bolje detalje nego prvi puta (<a href=\"https:\/\/www.youtube.com\/watch?v=lcjuG4aOztI\" target=\"_blank\" rel=\"noopener\">na YT mo\u017eete vidjeti moj prvi poku\u0161aj<\/a>). Na vrijeme sam postavio opremu, ali po\u010deli su zezati oblaci, pa je priprema bila dosta u\u017eurbana. SkyTrack ima odli\u010dnu mogu\u0107nost da se trasa preleta satelita unaprijed (automatski!) snimi kratkim ekspozicijama i tako verificira je li teleskop usmjeren to\u010dno tamo gdje \u0107e satelit pro\u0107i (<a href=\"https:\/\/astrobackyard.com\/plate-solving\/\" target=\"_blank\" rel=\"noopener\">plate solving<\/a>). To je vrlo va\u017eno za precizno centriranje satelita u vidnom polju. Program je to uspje\u0161no odradio s ekspozicijama od samo 2 sekunde!<\/p>\n<p>Me\u0111utim, kad je krenuo prelet oko 21:40 (19:30 UT), ISS se lijepo vidio golim okom, ali nije bio u vidnom polju kamere! Provjerio sam kroz tra\u017eilac teleskopa i zbilja, bio je skroz na rubu vidnog polja samog tra\u017eioca. Prili\u010dno frustriran, isklju\u010dio sam pra\u0107enje u softveru i nekako uspio manualno, koriste\u0107i kontroler, naciljati ISS koji je ve\u0107 bio na odlasku. Evo rezultata:<\/p>\n<p><iframe title=\"ISS transit, 23.5.2024.\" width=\"1240\" height=\"698\" src=\"https:\/\/www.youtube.com\/embed\/wZfeeaEVOEk?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n<p>Snimano je u primarnom fokusu Pentax 105 SDP apo refraktora (670 mm), monta\u017ea iOptron HAE29, kamera Player One Uranus-C (585 \u010dip). PiPP program je izvukao pojedina\u010dne sli\u010dice gdje je bio ISS i centrirao ga u vidnom polju, ina\u010de je to sve jako plesalo okolo.<\/p>\n<p>Bilo mi je jako \u010dudno da je ba\u0161 toliko proma\u0161io ISS. Nakon toga sam probao snimiti prelet jednog od mnogih raketnih boostera koji se jo\u0161 kotrljaju orbitom &#8211; booster je bio perfektno centriran u vidnom polju!<\/p>\n<p>Tek sljede\u0107i dan mi je sinulo da svemirska postaja povremeno ima reboost za podizanje orbite. Postaja je ogromna, pa na nju \u010dak i na visini od oko 400 km utje\u010de trenje s ono malo atmosfere \u0161to se jo\u0161 tamo nalazi. Zato se orbita polagano smanjuje i potrebno je podizanje orbite. ISS to radi nekih dvadesetak puta godi\u0161nje. Ovo je graf na poznatoj web stranici za identifikaciju satelita, Heavens Above:<\/p>\n<p><a href=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png\"><img fetchpriority=\"high\" decoding=\"async\" data-attachment-id=\"3745\" data-permalink=\"https:\/\/www.astrobobo.net\/?attachment_id=3745\" data-orig-file=\"https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png\" data-orig-size=\"814,721\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"ISS height 2024\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png\" class=\"aligncenter size-full wp-image-3745\" src=\"http:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png\" alt=\"\" width=\"814\" height=\"721\" srcset=\"https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png 814w, https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024-339x300.png 339w, https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024-226x200.png 226w, https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024-768x680.png 768w\" sizes=\"(max-width: 814px) 100vw, 814px\" \/><\/a>Kao \u0161to vidite, zadnja crta prikazuje veliki reboost, podizanje visine orbite s 411 km na 415. Istra\u017euju\u0107i dalje, naletio sam na <a href=\"https:\/\/forum.nasaspaceflight.com\/index.php?PHPSESSID=n00i9uq2dhsl5s0qlqb5blkh27&amp;topic=32006.3860\" target=\"_blank\" rel=\"noopener\">ovaj forum<\/a> gdje pi\u0161e:<\/p>\n<blockquote><p><strong>Current schedule of ISS flight events<\/strong><br \/>\n<em>UTC time is used in table<\/em><\/p>\n<p>2024<br \/>\nMay 24\u00a0 14:16:00 &#8211; ISS orbit&#8217;s reboost by Cygnus (NG-20) &#8220;S.S. Patricia &#8220;Patty&#8221; Hilliard Robertson&#8221; engines (dV= +1.1 m\/s)<br \/>\nMay 24\u00a0 <span class=\"bbc_color\">23:03:00<\/span> &#8211; ISS orbit&#8217;s reboost by Cygnus (NG-20) &#8220;S.S. Patricia &#8220;Patty&#8221; Hilliard Robertson&#8221; engines (dV= +1.1 m\/s)<\/p><\/blockquote>\n<p>Dakle, par sati prije preleta ISS je podigao svoju orbitu, a orbitalni elementi o\u010dito nisu bili odmah a\u017eurirani, pa je program usmjerio teleskop na krivo mjesto! Tako\u0111er sam naletio na <a href=\"https:\/\/www.cloudynights.com\/topic\/923470-iss-2024-may-25th\/\" target=\"_blank\" rel=\"noopener\">objavu na CloudyNights forumu<\/a> gdje je jedan \u010dlan tako\u0111er imao problema s ciljanjem ISS-a (pogledajte snimku, odli\u010dna je!), \u0161to je potvrdilo da se dogodio reboost!<\/p>\n<p>Iako sam bio frustriran \u0161to nisam uspio po\u0161teno uhvatiti ovaj prelet ISSa, na kraju je jako fora da sam pogodio trenutak nakon reboosta. Promet u orbiti je dinami\u010dan i na ovaj na\u010din mo\u017eemo osobno sudjelovati u pra\u0107enju aktivnosti.<\/p>\n<p>Za kraj evo i video boostera SL-16 R\/B. Video pokazuje to\u010dno kako je bilo snimano, bez ikakve stabilizacije, izrez sredine vidnog polja je napravljen odmah u programu Firecapture. Radi se o drugom stupnju rakete Zenit-2 koja je <a href=\"https:\/\/in-the-sky.org\/spacecraft.php?id=28353\" target=\"_blank\" rel=\"noopener\">iz Bajkonura lansirana 2004. godine<\/a>, a sada orbitira na visini oko 850 km.<\/p>\n<p><iframe title=\"SL-16 R\/B\" width=\"1240\" height=\"930\" src=\"https:\/\/www.youtube.com\/embed\/iu0rrmgpBgY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Zanimljiva situacija mi se dogodila u petak, 24.5.2024., prilikom poku\u0161aja snimanja preleta ISS-a (Me\u0111unarodne svemirske postaje). Naime, nedavno sam otkrio odli\u010dan program SkyTrack koji mo\u017ee upravljati nekim astronomskim monta\u017eama tako da kontinuirano prati prelet satelita u zemljinoj orbiti. Probao sam ga svega dva puta do sada, a u petak je bila odli\u010dna prilika jer je [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3745,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[15,123],"tags":[33,417,416,418],"class_list":["post-3744","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-izvjestaji","category-video","tag-iss","tag-medunarodna-svemirska-postaja","tag-satelit","tag-skytrack"],"acf":[],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/www.astrobobo.net\/wordpress\/wp-content\/uploads\/2024\/05\/ISS-height-2024.png","jetpack_sharing_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/3744","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3744"}],"version-history":[{"count":3,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/3744\/revisions"}],"predecessor-version":[{"id":3749,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/posts\/3744\/revisions\/3749"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=\/wp\/v2\/media\/3745"}],"wp:attachment":[{"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astrobobo.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}