{"id":23536,"date":"2011-11-21T15:29:22","date_gmt":"2011-11-21T14:29:22","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=23536"},"modified":"2011-11-21T22:06:46","modified_gmt":"2011-11-21T21:06:46","slug":"nr-290-2011","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2011\/11\/21\/nr-290-2011\/","title":{"rendered":"Nr 290 2011"},"content":{"rendered":"<h3><span style=\"text-decoration: underline;\">Utmaning f\u00f6r r\u00e4ddade JWST:<br \/>\n<\/span><\/h3>\n<h2>Hitta exoplaneter med faser!<\/h2>\n<p>Jag borde inte f\u00f6rv\u00e5nas \u00f6ver n\u00e5nting l\u00e4ngre inom astronomin, men jag m\u00e5ste erk\u00e4nna att\u00a0 jag fick tendens till st\u00e5p\u00e4ls n\u00e4r jag sprang p\u00e5 en story p\u00e5 n\u00e4tet om forskare som jagar exoplaneter som uppvisar m\u00e5nfaser. En exoplanet, om den ligger i r\u00e4tt riktning j\u00e4mf\u00f6rt med oss jordbor och har ett rimligt\u00a0 &#8220;\u00e5r&#8221;, b\u00f6r visa faser precis som m\u00e5nen, Venus och\u00a0 Merkurius &#8211; och Mars &#8211; i v\u00e5rt planetsystem.<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/seeingthepha.jpg\"><img decoding=\"async\" width=\"500\" height=\"500\" class=\"aligncenter size-full wp-image-23554\" style=\"width: 471px; height: 471px;\" title=\"Venus faser \u00e4r k\u00e4nda sen Galileis tid.\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/seeingthepha.jpg\" alt=\"\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/seeingthepha.jpg 500w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/seeingthepha-150x150.jpg 150w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/seeingthepha-300x300.jpg 300w\" sizes=\"(max-width: 500px) 100vw, 500px\" \/><\/a><\/p>\n<p>(Mosaiken ovan fr\u00e5n ESO)<\/p>\n<p><a href=\"http:\/\/arxiv.org\/PS_cache\/arxiv\/pdf\/1110\/1110.3087v1.pdf\">Franska astronomer, knutna till universitetet i Bordeaux, <\/a>har r\u00e4knat p\u00e5 saken och funderat p\u00e5 hur mycket ljus som g\u00e5r att detektera beroende p\u00e5 fasen och i vilka infrar\u00f6dav\u00e5gl\u00e4nder faserna b\u00e4st kan observeras. Mycket tycks bero p\u00e5 i vilken m\u00e5n en exoplanet har atmosf\u00e4r eller inte. Det enklaste &#8220;fallet&#8221; erbjuder en klippig stenplanet utan atmosf\u00e4r, och fransm\u00e4nnen tror att med upps\u00e4ndningen av infrar\u00f6dk\u00e4nsliga James Webb Space Telescope kommer exoplanetfaserna att g\u00e5 fr\u00e5n teori till astronomisk praktik.<\/p>\n<p>Exoplanetfaserna kan hj\u00e4lpa astronomerna att avg\u00f6ra en exoplanets best\u00e5ndsdelar, banradie, lutning och\u00a0 omloppstid, albedo m m, ja \u00f6verhuvud taget ge oss en uppsj\u00f6 annan nyttig information. Om inte moderstj\u00e4rnans eventuella variabilitet st\u00e4ller till det, f\u00f6r det \u00e4r en fakttor att r\u00e4kna med.<\/p>\n<p>\u00c4mnet \u00e4r extremt sp\u00e4nnande och kommer samtidigt som de gl\u00e4djande uppgiften dykt upp att JWST verkligen\u00a0 r\u00e4ddats och f\u00e5tt pengar av den amerikanska kongressen f\u00f6r 2012. I Senaten r\u00f6stades slantarna fram med r\u00f6stsiffrorna 70-30, i &#8220;Huset&#8221; slutade r\u00f6stsiffrorna med 298 vs 121 till JWST:s f\u00f6rdel.<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/JWST-HST-primary-mirrors.jpg\"><img decoding=\"async\" class=\"aligncenter size-large wp-image-23558\" title=\"Hubble-teleskopets eftertr\u00e4dare har f\u00e5tt gr\u00f6nt ljus. \" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/JWST-HST-primary-mirrors-1024x693.jpg\" alt=\"\" width=\"450\" height=\"304\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/JWST-HST-primary-mirrors-1024x693.jpg 1024w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/JWST-HST-primary-mirrors-300x203.jpg 300w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/JWST-HST-primary-mirrors.jpg 1414w\" sizes=\"(max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Kampanjen lyckades, och jag tror att m\u00e5nga amerikanska astronomer inom NASA-kollektivet \u00e4r heln\u00f6jda \u00f6ver st\u00f6det fr\u00e5n t ex oss europ\u00e9er. JWST \u00e4r ju en multinationell angel\u00e4genhet.<\/p>\n<p>Ber\u00e4knad upps\u00e4ndning \u00e4r om n\u00e5gra \u00e5r och d\u00e5 i en bana l\u00e5ngt utanf\u00f6r alla reparationsm\u00f6jligheter.<\/p>\n<h2>Solutbrott riktat mot Venus<\/h2>\n<p>Att jordklotet och v\u00e5r elektrifierande magnetosf\u00e4r p\u00e5verkas av solstormar typ CME, Coronal Mass Eruptions, vet vi. Men hur \u00e4r det med\u00a0 de andra inre planeterna? Just nu larmas det om <a href=\"http:\/\/spaceweather.com\/\">en CME med riktning mot Venus<\/a>, och det ska bli intressant att f\u00f6lja fenomenet d\u00e4rifr\u00e5n.<\/p>\n<p>Titt som t\u00e4tt noterar sonderna runt Merkurius och Venus om dessa solutbrott, som ju f\u00f6r det mesta n\u00e5r v\u00e5ra grannplaneter tidigare \u00e4n jorden. Lite grand beror detta p\u00e5 hur planeterna ligger i sina banor\u00a0 j\u00e4mf\u00f6rt med jorden. Ligger vi p\u00e5 rad i undre konjunktion \u00e4r saken klar, men fullt s\u00e5 enkelt \u00e4r det inte alltid.<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/venuscme_strip21.jpg\"><img decoding=\"async\" width=\"512\" height=\"347\" class=\"aligncenter size-full wp-image-23583\" style=\"width: 480px; height: 327px;\" title=\"Venus drabbas av solutbrott. Bilden \u00e4r fr\u00e5n i augusti i \u00e5r. Foto: SOHO\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/venuscme_strip21.jpg\" alt=\"\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/venuscme_strip21.jpg 512w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/venuscme_strip21-300x203.jpg 300w\" sizes=\"(max-width: 512px) 100vw, 512px\" \/><\/a><\/p>\n<h2>NASA-schabbel<\/h2>\n<p>J\u00e4nkarna lyckas inte med allt. N\u00e5tt \u00e4r helt fel med NASA:s n\u00e4tbaserade photojournal, som jag inte kommit \u00e5t p\u00e5 flera veckor. N\u00e5n som upplevt detsamma?<\/p>\n<p>Eller \u00e4r det min dator som mot f\u00f6rmodan konstrar?<\/p>\n<h2>FN r\u00e4ddar oss?<\/h2>\n<p>N\u00e4r ett g\u00e4ng experter m\u00f6ttes f\u00f6r en tid sedan f\u00f6r att prata om de asteroidrisker som jordklotet hela tiden \u00e4r utsatt f\u00f6r, var det <a href=\"http:\/\/www.oosa.unvienna.org\/oosa\/en\/COPUOS\/members.html\">FN-organet COPUOS som stod f\u00f6r inbjudan &#8211; Committee on the Peaceful Uses of Outer Space<\/a>.<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/2005_YU55_Carroll.jpg\"><img decoding=\"async\" class=\"alignleft size-medium wp-image-23547\" title=\"Asteroiden 2005 YU55 \u00e4r inte  &quot;st\u00f6rre&quot; \u00e4n ett vanligt hangarfartyg... Ill: Sky and Telescope\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/2005_YU55_Carroll-241x300.jpg\" alt=\"\" width=\"241\" height=\"300\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/2005_YU55_Carroll-241x300.jpg 241w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/2005_YU55_Carroll.jpg 322w\" sizes=\"(max-width: 241px) 100vw, 241px\" \/><\/a>N\u00e5n internationell \u00f6verenskommelse f\u00f6r plikten att varna varandra inf\u00f6r en annalkande asteroidkrasch, finns faktiskt inte. Vi litar som vanligt p\u00e5 att USA ska g\u00f6ra grovjobbet.<\/p>\n<p>Tsunamin h\u00e4rom l\u00e4rde oss en del om behovet av gr\u00e4ns\u00f6verskridande avtal, och nu riktas blickarna upp\u00e5t. Snabbfarande asteroiden 2005 YU55 hade i alla fall det goda med sig, att himlakroppen fick experterna att t\u00e4nka efter en g\u00e5ng till om ett varningssystem. Sen \u00e4r det fr\u00e5gan om v\u00e4rldens regeringar \u00e4r med p\u00e5 noterna (och notan!). I botten handlar det om framf\u00f6rh\u00e5llning, en maffig krasch av en sm\u00e5planet 10 mil tv\u00e4rs\u00f6ver intr\u00e4ffar statistiskt kanske vart 100:e miljonte \u00e5r, s\u00e5 vi har tid p\u00e5 oss n\u00e4r det g\u00e4ller s\u00e5dana bj\u00e4ssar.<\/p>\n<p>Men, men. Ju mindre de hotande himlakropparna \u00e4r, desto fler \u00e4r de ocks\u00e5, och det \u00e4r t\u00e4nkbart att vi f\u00e5r r\u00e4kna med en sm\u00e4ll av en 30-meters rymdsten vart 500:e \u00e5r. N\u00e5got liknande skedde i atmosf\u00e4ren \u00f6ver Sibirien 1908, s\u00e5 fenomenet \u00e4r inte bara hypotetiskt.<\/p>\n<p>S\u00e5 sent som 2008 ramlade en rej\u00e4l sten ner \u00f6ver Sudan och splittrades i sina best\u00e5ndsdelar, vilket W-bloggen tidigare ber\u00e4ttat om.<\/p>\n<p>2013 \u00e4r f\u00f6rhoppningen att FN ska ta itu med saken genom internationellt bindande avtal och rekommendationer, bl a med en sorts &#8220;kokbok i rymdkatastrofer&#8221;.<\/p>\n<p>Man m\u00e5 tycka vad man vill om FN och t ex dess kultur- och forskningsorgansiation UNESCO, som \u00e4r en del osannolika diktatorers lekstuga, men det \u00e4r tyv\u00e4rr det enda vi har att h\u00e5lla oss till. B\u00e4ttre \u00e4n ett halmstr\u00e5 i alla fall!<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/Halmstr_.jpg\"><img decoding=\"async\" class=\"aligncenter size-thumbnail wp-image-23550\" title=\"Typiskt halmstr\u00e5.\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/Halmstr_-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a><\/p>\n<h2>Nyfiken i en strut<\/h2>\n<p>Med murvelns r\u00e4tt \u00e4r jag enormt nyfiken p\u00e5 vad veckan b\u00e4r i sitt sk\u00f6te inom v\u00e5r sp\u00e4nnande vetenskap.<\/p>\n<p>Stay tuned s\u00e5 f\u00e5r du se!<\/p>\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/stay_tuned.jpg\"><img decoding=\"async\" class=\"aligncenter size-medium wp-image-23564\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/stay_tuned-300x226.jpg\" alt=\"\" width=\"300\" height=\"226\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/stay_tuned-300x226.jpg 300w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2011\/11\/stay_tuned.jpg 505w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Utmaning f\u00f6r r\u00e4ddade JWST: Hitta exoplaneter med faser! Jag borde inte f\u00f6rv\u00e5nas \u00f6ver n\u00e5nting l\u00e4ngre inom astronomin, men jag m\u00e5ste erk\u00e4nna att\u00a0 jag fick tendens till st\u00e5p\u00e4ls n\u00e4r jag sprang p\u00e5 en story p\u00e5 n\u00e4tet om forskare som jagar exoplaneter som uppvisar m\u00e5nfaser. En exoplanet, om den ligger i r\u00e4tt riktning j\u00e4mf\u00f6rt med oss jordbor&hellip;&nbsp;<a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/2011\/11\/21\/nr-290-2011\/\" rel=\"bookmark\">L\u00e4s mer &raquo;<span class=\"screen-reader-text\">Nr 290 2011<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","neve_meta_sidebar":"","neve_meta_container":"","neve_meta_enable_content_width":"","neve_meta_content_width":0,"neve_meta_title_alignment":"","neve_meta_author_avatar":"","neve_post_elements_order":"","neve_meta_disable_header":"","neve_meta_disable_footer":"","neve_meta_disable_title":"","footnotes":""},"categories":[3],"tags":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.8 - aioseo.com -->\n\t<meta name=\"description\" content=\"Utmaning f\u00f6r r\u00e4ddade JWST: Hitta exoplaneter med faser! 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