{"id":4367,"date":"2010-06-23T12:29:37","date_gmt":"2010-06-23T11:29:37","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=4367"},"modified":"2010-06-23T20:34:45","modified_gmt":"2010-06-23T19:34:45","slug":"nt-84-2010","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2010\/06\/23\/nt-84-2010\/","title":{"rendered":"Nr 84 2010"},"content":{"rendered":"<h2>En proffsig ockultation!<\/h2>\n<figure id=\"attachment_4378\" aria-describedby=\"caption-attachment-4378\" style=\"width: 350px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/617990434.jpg\"><img decoding=\"async\" class=\"size-full wp-image-4378\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/617990434.jpg\" alt=\"\" width=\"350\" height=\"262\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/617990434.jpg 350w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/617990434-300x224.jpg 300w\" sizes=\"(max-width: 350px) 100vw, 350px\" \/><\/a><figcaption id=\"caption-attachment-4378\" class=\"wp-caption-text\">En stj\u00e4rna f\u00f6rm\u00f6rkas. Ill: NASA<\/figcaption><\/figure>\n<p>Det \u00e4r inte bara vi amat\u00f6rastronomer som g\u00e5r i v\u00e4ntans tider &#8211; jag t\u00e4nker f\u00f6rst\u00e5s p\u00e5 Roma-ockultationen 8 juli. Proffsastronomerna sysslar p\u00e5 sin kant med ett mycket sp\u00e4nnande projekt:<\/p>\n<p>Att m\u00e4ta n\u00e5gra av de\u00a0 70 000 k\u00e4nda +100 km KBO:na,\u00a0 objekten i Kuiper-b\u00e4ltet, med hj\u00e4lp av stj\u00e4rnor som ockulteras, f\u00f6rm\u00f6rkas.\u00a0 F\u00f6r\u00e4ndringen i\u00a0 en stj\u00e4rnas ljusstyrka hj\u00e4lper oss m\u00e4ta ett KBO:s storlek,\u00a0 dess temperatur, eventuellt f\u00f6rekommande atmosf\u00e4r med mera.<\/p>\n<p>Skolexemplet ges av KBO 55636, som i oktober i fjor ockulterade en stj\u00e4rna. En rad observatorier i v\u00e4rlden var inkopplade p\u00e5 ockultationen &#8211; en hel vetenskap bara att ber\u00e4kna banan \u00f6ver stj\u00e4rnan! -, som fastnade p\u00e5 pl\u00e5tarna bl a hos n\u00e5gra \u00a0 Hawaii-teleskop. Ockultationen varade i cirka 10 sekunder, och genom att m\u00e4ta hastigheten p\u00e5 Kuiper-objektets skugga kom forskarna fram till att dess storlek r\u00f6r sig om 143 kilometer (plusminus 5 km)<\/p>\n<p>D\u00e4refter kunde de ber\u00e4kna objektets albedo, som \u00e4r ett m\u00e5tt p\u00e5 ytans reflektion av solljuset och som ber\u00e4ttar om ytans beskaffenhet, och h\u00e4r kommer vi till den stora \u00f6verraskningen:<\/p>\n<p>Albedot \u00e4r s\u00e5 h\u00f6gt att ytan bara kan best\u00e5 av en myckenhet is och sn\u00f6. Forskarna hade f\u00f6rv\u00e4ntat sig en m\u00f6rk, smutsig\u00a0 yta. I rapporten, publicerad i<em> Nature<\/em>, talas om att &#8220;the dynamical age implies either that KBO 55636 has an active resurfacing mechanism, or that fresh water-ice in the outer Solar System can persist for gigayear timescales&#8221;.<\/p>\n<p>Jag gillar uttrycket &#8220;gigayear&#8221;!<\/p>\n<p>Den \u00f6vergripande teorin om att m\u00e5nga av Kuiper-b\u00e4ltets himlakroppar \u00e4r resultat av en st\u00f6rre planetkollision f\u00f6r cirka en miljard \u00e5r sedan &#8211; en sm\u00e4ll med en inblandad isig sm\u00e5planet som ett av offren &#8211; anses ha styrkts.<\/p>\n<p>Forskarteamet bakom <a href=\"http:\/\/web.mit.edu\/press\/2010\/kuiper-release.html\" target=\"_self\">ockultationen leddes av\u00a0 professor James Elliot vid klassiska MIT<\/a>, Michigan Institute of Technology. Elliot\u00a0 har i fem \u00e5r studerat &#8220;sitt&#8221; KBO, och n\u00e4sta m\u00e5l f\u00f6r honom \u00e4r att studera liknande KBO-ockultationer med hj\u00e4lp av SOFIA (Stratospheric Observatory for Infrared Astronomy),\u00a0 NASA:s helt unika,\u00a0 ombyggda BOEING-jumbo med ett infrar\u00f6tt teleskop\u00a0 i flygplanets bakre delar.<\/p>\n<p>PS.\u00a0 KBO 55636 har en app magnitud runt 19.<\/p>\n<h2>Mango och Tango separerar 3 augusti<\/h2>\n<p>&#8211; PRISMA tuffar p\u00e5 d\u00e4r ute i sin omloppsbana, <a href=\"http:\/\/www.prismasatellites.se\/bloggen.aspx\" target=\"_self\">ber\u00e4ttar Krister Sj\u00f6lander i sin Prisma-blogg i dag<\/a>.<\/p>\n<p>Den svenska satelliten har nu b\u00f6rjat navigera efter stj\u00e4rnor i st\u00e4llet f\u00f6r solen.<\/p>\n<p>3 augusti \u00e4r det meningen att &#8220;mor&#8221; och &#8220;dotter&#8221; ska separeras; Mango och Tango ska sen formationsflyga och visa vad de och d\u00e4rmed den huvudsakligen svenska Prisma-tekniken duger till.<\/p>\n<h2>Snapsvisor med astronomiska motiv (2)<\/h2>\n<figure id=\"attachment_4381\" aria-describedby=\"caption-attachment-4381\" style=\"width: 150px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/Einstein-laughing2.jpg\"><img decoding=\"async\" class=\"size-thumbnail wp-image-4381\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/Einstein-laughing2-150x150.jpg\" alt=\"\" width=\"150\" height=\"150\" \/><\/a><figcaption id=\"caption-attachment-4381\" class=\"wp-caption-text\">Hade gillat &quot;sin&quot; snapsvisa! <\/figcaption><\/figure>\n<p>Dagens vers med titeln\u00a0 <em>E = mc2<\/em> vann faktisk snapsvise-SM 2006, \u00e4r skriven p\u00e5 melodin till <em>Sk\u00e5nska slott och herres\u00e4ten<\/em> och har tv\u00e5 f\u00f6rfattare: Rolf Malm\u00f6str\u00f6m, \u00c4ngelholm, Jan Carlestam, \u00d6rkelljunga.<\/p>\n<p>S\u00e5 h\u00e4r g\u00e5r den:<\/p>\n<p><span style=\"text-decoration: underline;\"><strong>N\u00e4r Einstein studerade massan och ljuset<br \/>\ns\u00e5 ljusnade pl\u00f6tsligt problemet med ruset:<br \/>\nEtt glas med en hel massa Renat uti<br \/>\nf\u00f6rvandlas i kroppen till ren energi. <\/strong><\/span><\/p>\n<p>I juryn satt bl a Horace Engdahl, och juryns\u00a0 motivering l\u00f6d:<br \/>\n&#8220;Visan \u00f6verbrygger (obs medvetet stavfel) klyftan mellan naturvetenskap och konst och visar att allting icke \u00e4r relativt, som Einstein trodde, utan att det i tillvaron finns n\u00e5got absolut.&#8221;<\/p>\n<h2>Turistf\u00e4llor f\u00f6r ET<\/h2>\n<p>Om vi s\u00e4ger att jag \u00e4r en ung ET, \u00e4r nyfiken och vill kolla in jordbornas intresse och utforskning f\u00f6r astronomin och rymdfarten genom historien, vilka \u00e4r det ABSOLUTA &#8220;m\u00e5sten&#8221; ur historisk synvinkel? En rimlig\u00a0 guidtur borde ta ET till f\u00f6ljande platser:<\/p>\n<p><strong>1. Tycho Brahes Hven-l\u00e4mningar. <\/strong><\/p>\n<p>Sj\u00e4lvklar startpunkt f\u00f6r att visa hur l\u00e5ngt jordborna kom med obev\u00e4pnat \u00f6ga.<\/p>\n<p><strong>2. Greenwich-observatoriet, London. <\/strong><\/p>\n<p>Mest f\u00f6r att visa hur astronomi och marina handels- och v\u00e4rldsherrav\u00e4lde-intressen (jakten p\u00e5 longituden) en g\u00e5ng gick hand i hand.<\/p>\n<figure id=\"attachment_4368\" aria-describedby=\"caption-attachment-4368\" style=\"width: 200px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/day-of-discovery-birr-castle-telescope-ireland.jpg\"><img decoding=\"async\" class=\"size-full wp-image-4368 \" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/day-of-discovery-birr-castle-telescope-ireland.jpg\" alt=\"\" width=\"200\" height=\"150\" \/><\/a><figcaption id=\"caption-attachment-4368\" class=\"wp-caption-text\">Ett m\u00e5ste f\u00f6r ET! Foto: Birr Castle<\/figcaption><\/figure>\n<p><strong>3. Lord Rosses teleskop<\/strong><\/p>\n<p>P\u00e5 Birr Castle p\u00e5 Gr\u00f6na \u00d6n\u00a0 l\u00e4r Lord Rosse bygga Leviathan, tidens (1840-talet) st\u00f6rsta teleskop med vilken han bl a fick syn p\u00e5 de f\u00f6rsta spiralgalaxerna.<\/p>\n<p><strong>4. Mount Wilson<\/strong><\/p>\n<p>Med Hooker-teleskopet kunde den nya v\u00e4rldsbilden sl\u00e5s fast. Edwin Hubble fastslog universums expansion med hj\u00e4lp av\u00a0 bilder tagna med 2,5-metersreflektorn.<\/p>\n<p><strong>5. Einstein-tornet i Berlin, Potsdam<\/strong><\/p>\n<p>H\u00e4r f\u00f6rs\u00f6kte Einsteins kolleger p\u00e5 1920-talet fastsl\u00e5 den gravitionella r\u00f6df\u00f6rskjutningen. Men instrumenten och tekniken var \u00e4nd\u00e5 f\u00f6r grova och inexakta.<\/p>\n<p><strong>6. Peenem\u00fcnde<\/strong><\/p>\n<p>Inte f\u00f6r krigets skull utan f\u00f6r rymdfartens och rymdutforskningens skull. Med V2:an ville tyska solforskare studera solens ultravioletta koronautstr\u00e5lning, men Hitler f\u00f6rbj\u00f6d. Varje raket skulle f\u00e4lla bomber \u00f6ver London.<\/p>\n<p><strong><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/images1.jpeg\"><img decoding=\"async\" class=\"alignleft size-full wp-image-4375\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2010\/06\/images1.jpeg\" alt=\"\" width=\"117\" height=\"88\" \/><\/a>7. Jodrell Bank<\/strong><\/p>\n<p>F\u00f6r att h\u00e4r utf\u00f6rdes n\u00e5gra av de fr\u00e4msta radioastronomiska observationerna redan p\u00e5 50-talet.<\/p>\n<p>Har ET tur kan han\/hon f\u00e5 ett fikasnack med teleskopets skapare,\u00a0 Sir ACB Lovell, 97.<\/p>\n<p><strong>8. Vatikan-observatoriet, Rom<\/strong><\/p>\n<p>Ja, varf\u00f6r inte? De katolska astronomerna kan ju ber\u00e4tta om dagens forskning och om kyrkans f\u00f6rf\u00f6ljelse av Galileo Galilei och varf\u00f6r Giordano Bruno br\u00e4ndes p\u00e5 b\u00e5l.<\/p>\n<p><strong>9. Niels Bohrs grav, Assistens kirkeg\u00e5rd<\/strong><\/p>\n<p>P\u00e5 denna rara kyrkog\u00e5rd i K\u00f6penhamn fick Bohr, den moderna atomteorins skapare, sin sista vila.<strong><br \/>\n<\/strong><\/p>\n<p><strong>10. Helgoland<\/strong><\/p>\n<p>H\u00e4r satt Werner Heisenberg en vacker morgon 1925\u00a0 och &#8220;kom p\u00e5&#8221; den moderna kvantfysiken.<\/p>\n<h2>Annons 2050 (aprop\u00e5 f\u00f6rra bloggen)<\/h2>\n<p>Uthyres: Lavar\u00f6r p\u00e5 m\u00e5nen med takf\u00f6nster.<\/p>\n<p>Svar till NASA.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En proffsig ockultation! Det \u00e4r inte bara vi amat\u00f6rastronomer som g\u00e5r i v\u00e4ntans tider &#8211; jag t\u00e4nker f\u00f6rst\u00e5s p\u00e5 Roma-ockultationen 8 juli. Proffsastronomerna sysslar p\u00e5 sin kant med ett mycket sp\u00e4nnande projekt: Att m\u00e4ta n\u00e5gra av de\u00a0 70 000 k\u00e4nda +100 km KBO:na,\u00a0 objekten i Kuiper-b\u00e4ltet, med hj\u00e4lp av stj\u00e4rnor som ockulteras, f\u00f6rm\u00f6rkas.\u00a0 F\u00f6r\u00e4ndringen i\u00a0&hellip;&nbsp;<a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/2010\/06\/23\/nt-84-2010\/\" rel=\"bookmark\">L\u00e4s mer &raquo;<span class=\"screen-reader-text\">Nr 84 2010<\/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=\"En proffsig ockultation! 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