{"id":300,"date":"2015-05-27T21:52:16","date_gmt":"2015-05-27T19:52:16","guid":{"rendered":"http:\/\/www.austrianaviationart.org\/cms\/?p=300"},"modified":"2015-05-27T21:53:16","modified_gmt":"2015-05-27T19:53:16","slug":"komet-lovejoy-c2014-q2","status":"publish","type":"post","link":"https:\/\/www.austrianaviationart.org\/cms\/komet-lovejoy-c2014-q2\/","title":{"rendered":"Komet Lovejoy C\/2014 Q2"},"content":{"rendered":"<p>Mein erster Komet!<\/p>\n<p>Lovejoy beehrt uns ab Mitte J\u00e4nner. Visuell ist er mit 4 mag an der Sichtbarkeitsgrenze eines guten Sternenhimmels, nur welcher von den Punkten ist es? Wer eine Digtalkamera hat, kann ihn aber leicht identifizieren, einfach mit erh\u00f6hter ISO (1600-3200) auf einem Stativ mit ca. 50-100mm Tele auf die richtige Sternenregion halten. Er ist eindeutig als gr\u00fcner Fleck zu erkennen. In weiterem Verlauf des J\u00e4nners wird er sich in Richtung Sonne bewegen, als weiter westlich zu sehen sein.<\/p>\n<p>Der Kern mit seinem Koma ist wie schon geschrieben stark gr\u00fcn\/blau, der Schweif einiges schw\u00e4cher, aber sehr lang. Eine <a title=\"Astroforum: Tommy Nawratil - Lovejoy mit Sigma 180mm\" href=\"http:\/\/www.astronomieforum.at\/viewtopic.php?f=34&amp;t=9620\" target=\"_blank\">Fotooptik um die 200-300mm<\/a> w\u00e4re da schon richtig, aber man sollte dann schon 1 Stunde Belichtungszeit aufwenden. Das geht nat\u00fcrlich nur mit entsprechender Nachf\u00fchrung mit Guiding, bleibt also eher den Profis vorbehalten.<\/p>\n<p>Ich hab mich nat\u00fcrlich auch versucht: So einfach er auf einem gro\u00dffl\u00e4chigen Foto zu finden ist, ihn im Sucherfernrohr (Fernglas) zu finden ist entsprechend schwieriger. Hat man ihn gefunden, sieht der gro\u00dfe nebeligen Fleck, durchaus nett aus, auch im Teleskop mit gro\u00dfem Gesichtsfeld (26mm Okular).<\/p>\n<p>Am 12.1.2014, vor allem aber am 13.1. gab es nach langen Monaten des Wartens endlich mal ein recht klare Nacht, entsprechend die Bilder der vielen <a title=\"Astronomieforum.at: Sonnensystem\" href=\"http:\/\/www.astronomieforum.at\/viewforum.php?f=34\" target=\"_blank\">Hobbyastronomen in der Foren<\/a>. So Atemberaubend die hochgeladenen Bilder auch waren: Sie zeigen eines, ohne Beherrschung von EBV (elektronischer Bildverarbeitung) kommt man da nicht ann\u00e4hernd hin. Es gibt zwar diverse Tools, die einem wichtige Schritte abnehmen, aber im Grunde muss man letztendlich noch im Photoshop zusammenf\u00fchren. Man mu\u00df es klar sagen: Die Wirklichkeit sieht ganz anders aus.<\/p>\n<p>Das Koma des Kometen ist recht hell, der Schweif relativ schwach. Der Komet bewegt sich recht stark zu den Hintergrundsternen. Ein Standartfunktion ist in der Astrofotografie, mehrere Einzelbilder aufaddieren (stacken). Vorher muss man sie nat\u00fcrlich Deckungsgleich bringende (registrieren).<\/p>\n<p>Bei Stacken des Kometen wird das Koma um den Kern nat\u00fcrlich viel gr\u00f6\u00dfer, daf\u00fcr tritt aber der Schweif deutlicher hervor. Bei der Ausrichtung der einzelnen Bilder kann man entweder auf die Sterne als Bezugspunkt gehen, dann aber verschiebt sich der Komet, oder auf den Kometen, dann sieht man aber die Sterne x-fach abgebildet, oder bei viele Bildern die Sterne als Strichspuren. Mit Softwarehilfe kann man das Rechnen lassen. Kompromiss ist es aber allemal. Man sollte auch bedenken, dass die Vorg\u00e4nge um den Kometen sehr dynamisch sein k\u00f6nnen, also auch lange Belichtungsserien die zusammengerechnet werden nicht unbedingt diese Unterschiede zeigen. Es ist in etwa so, wie wenn man versucht, Bilder einer flackernden Kerze \u00fcber einen l\u00e4ngeren Zeitraum zu verrechen.<\/p>\n<p>Hier mal meine ersten Versuche:<\/p>\n \n<!-- Start container 1 --><div id=\"wppa-modal-container-1\" class=\"wppa-modal-container\" style=\"position:relative;z-index:100000;\" data-wppa=\"yes\" ontouchmove=\"event.stopPropagation();\"><\/div><div id=\"wppa-container-wrapper-1\" class=\"alignnone wppa-container-wrapper \" style=\"width:100%;clear:both;padding:0;position:relative;\"><div id=\"wppa-container-1\" style=\"width:100%;\" class=\"wppa-container wppa-container-1 wppa-rev-9208003 wppa-prevrev-9207002 wppa-theme-9.2.08.003 wppa-api-9.2.08.003\"><svg id=\"wppa-ajax-spin-1\" class=\"wppa-ajax-spin uil-default\" width=\"120px\" height=\"120px\" viewBox=\"0 0 100 100\" preserveAspectRatio=\"xMidYMid\" stroke=\"\" style=\"width:120px; height:120px; position:fixed; top:50%; margin-top:-60px; left:50%; margin-left:-60px; opacity:1; display:none; 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id=\"wppa-container-1-end\"><\/div><\/div><\/div>\n<!-- End [wppa type=\"slide\" album=\"18\"] \/cms\/wp-json\/wp\/v2\/posts\/300 oc 1 37 queries in 19.3 ms. at 17:21. Max mem: 64.50 Mb. -->\n<p><span style=\"color: #000080;\">Ein paar kurze Infos zum Komet Lovejoy C\/2014 Q2<\/span><\/p>\n<p>Es war bereits der 5. Komet, den der Australische Hobbyastronom Terry Lovejoy entdeckte. Damals hatte er eine Helligkeit von 15 mag, also sehr schwach, Mitte J\u00e4nner, als er in ca. 70 Millionen km zwischen Erde und Marsbahn durchflog, stieg sie auf 3,8 mag (13.1.2015) an, damit konnte man ihn an klaren sternklaren N\u00e4chten au\u00dferhalb gr\u00f6\u00dferer St\u00e4dte sehen. Der Schweif war relativ schwach und strahlte in einem sch\u00f6nen gr\u00fcn. <a title=\"Why ISON look green\" href=\"http:\/\/www.planetary.org\/blogs\/guest-blogs\/2013\/20131028-why-does-ison-look-green.html\" target=\"_blank\">Spektroskopische Analysen<\/a> zeigten, dass die Farben haupts\u00e4chlich von Ionisierten Zweiatomigen Kohlenstoff (C2) stammten. Daneben auch noch di-Cyankohlenstoff (CN2)2. Der Schweif wurde bis 8 Grad (16fache der scheinbaren Mondgr\u00f6\u00dfe) lang. Relativ zur Sonne bewegte er sich mit um die 130.000 km\/h. Die Gr\u00f6\u00dfe des Kerns wurde auf ca. <a title=\"Nasa: Comet Lovejoy 1\/2014\" href=\"http:\/\/science.nasa.gov\/science-news\/science-at-nasa\/2012\/12jan_cometlovejoy\/\" target=\"_blank\">200m gesch\u00e4tzt eventuell sogar 500 m<\/a>. Damit der gr\u00f6\u00dfte seit 40 Jahren!<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mein erster Komet! Lovejoy beehrt uns ab Mitte J\u00e4nner. Visuell ist er mit 4 mag an der Sichtbarkeitsgrenze eines guten Sternenhimmels, nur welcher von den Punkten ist es? Wer eine Digtalkamera hat, kann ihn aber leicht identifizieren, einfach mit erh\u00f6hter ISO (1600-3200) auf einem Stativ mit ca. 50-100mm Tele auf die richtige Sternenregion halten. Er &hellip; <a href=\"https:\/\/www.austrianaviationart.org\/cms\/komet-lovejoy-c2014-q2\/\" class=\"more-link\"><span class=\"screen-reader-text\">Komet Lovejoy C\/2014 Q2<\/span> weiterlesen<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55],"tags":[90],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-comets","tag-kometen"],"_links":{"self":[{"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/posts\/300","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/comments?post=300"}],"version-history":[{"count":2,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/posts\/300\/revisions"}],"predecessor-version":[{"id":302,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/posts\/300\/revisions\/302"}],"wp:attachment":[{"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/media?parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/categories?post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.austrianaviationart.org\/cms\/wp-json\/wp\/v2\/tags?post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}