{"id":12017,"date":"2011-03-24T09:57:43","date_gmt":"2011-03-24T08:57:43","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=12017"},"modified":"2011-03-24T10:02:31","modified_gmt":"2011-03-24T09:02:31","slug":"nr-77-2011","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2011\/03\/24\/nr-77-2011\/","title":{"rendered":"Nr 77 2011"},"content":{"rendered":"

Fr\u00e5n exoplanet till brun stj\u00e4rna… och tillbaka igen?<\/h2>\n
\"\"<\/a>
Ju mindre stj\u00e4rndv\u00e4rg, desto st\u00f6rre gasplanet? Ill:Jon Lomberg\/Gemini Observatory.<\/figcaption><\/figure>\n

F\u00f6r att demonstrera likheterna i den flytande gr\u00e4nsen mellan sm\u00e5 bruna dv\u00e4rgar och stora gasplaneter, har gamle MARS:ianen Arne Lindengard<\/strong> agerat detektiv och s\u00f6kt p\u00e5 n\u00e4tet efter koordinaterna f\u00f6r det senast uppt\u00e4ckta ultrakalla stj\u00e4rnsystemet (se f\u00f6rra bloggen):<\/p>\n

– L\u00e4s och h\u00e4pna, det finns med i katalogen \u00f6ver exoplaneter p\u00e5 n\u00e4tet: http:\/\/exoplanet.eu\/<\/a>.\u00a0 Detta kalla stj\u00e4rnsystem ligger i syd\u00f6stra delen av Bj\u00f6rnvaktaren. Precisa koordinater::<\/p>\n

* Right Asc. Coord.\t14h 58m 29s
\n* Decl. Coord.\t+10g 13′ 43″<\/p>\n

– P\u00e5 siten finns en sida \u00f6ver systemet: http:\/\/exoplanet.eu\/star.php?st=CFBDS+1458,<\/a> som ger lite mer k\u00f6tt p\u00e5 benen. Men det finns ingen optisk magnitud angiven, bara infrar\u00f6da magnituder f\u00f6r tre olika v\u00e5gl\u00e4ngder, ber\u00e4ttar Arne.<\/p>\n

En koll hos forskarteamet, ger ytterligare lite besked:<\/p>\n

THE STAR<\/span><\/p>\n

Name\u00a0\u00a0 \u00a0CFBDS 1458
\nDistance\u00a0\u00a0 \u00a023.1 (\u00b1 2.4) pc
\nSpectral Type\u00a0\u00a0 \u00a0T9.5
\nApparent Magnitude H\u00a0\u00a0 \u00a020.18
\nApparent Magnitude J\u00a0\u00a0 \u00a019.86
\nApparent Magnitude K\u00a0\u00a0 \u00a020.63
\nMass\u00a0\u00a0 \u00a024 (\u00b1 16) Msun \u00a0\u00a0 \u00a0ref.
\nAge\u00a0\u00a0 \u00a03 (\u00b1 2) Gyr \u00a0\u00a0 \u00a0ref.
\nEffective Temperature\u00a0\u00a0 \u00a0540 (\u00b1 60) K \u00a0\u00a0 \u00a0ref.
\n<\/span><\/p>\n

PLANET<\/span><\/p>\n

Name\u00a0\u00a0 \u00a0CFBDS 1458 b
\nDiscovered in\u00a0\u00a0 \u00a02011
\nMass\u00a0\u00a0 \u00a06.5 (\u00b1 4.5) MJ \u00a0\u00a0 \u00a0ref.
\n*-Planet Dist. (proj.)\u00a0\u00a0 \u00a02.6 AU \u00a0\u00a0 \u00a0ref.
\nOrbital period\u00a0\u00a0 \u00a040 (\u00b1 24) days \u00a0\u00a0 \u00a0ref.
\nUpdate\u00a0\u00a0 \u00a002\/03\/11<\/p>\n

– Molecules detected :<\/p>\n

Name\u00a0\u00a0 \u00a0CFBDS 1458 b
\nMolecules\u00a0\u00a0 \u00a0None<\/p>\n

I abstraktet till forskarteamets rapport st\u00e5r s\u00e5 h\u00e4r (urs\u00e4kta att det blir mycket p\u00e5 engelska\u00a0 i denna notis):<\/p>\n

“Given its low luminosity, atypical colors and cold temperature, CFBDS J1458+10B is a promising candidate for the hypothesized Y spectral class. However, regardless of its ultimate classification, CFBDS J1458+10AB provides a new benchmark for measuring the properties of brown dwarfs and gas-giant planets, testing substellar models, and constraining the low-mass limit for star formation.”<\/span><\/p>\n

Hela rapporten finns h\u00e4r som pdf-fil:<\/p>\n

http:\/\/arxiv.org\/pdf\/1103.0014v2<\/a><\/p>\n

Hans Bengtssons ABC<\/h2>\n

\"\"<\/a>Framme vid bokstaven L som i Ludvig kommer\u00a0 Hans Bengtsson<\/strong> i sitt ABC f\u00f6r astronomer<\/em><\/span> i dag in p\u00e5 en kompis till Cornelis Vreeswijk<\/strong>:<\/p>\n

L<\/span>yran har jag vart p\u00e5 sa polaren P\u00e4r,<\/span><\/p>\n

s\u00e5 mitt himmelska hem blir f\u00f6rmodligen d\u00e4r.<\/span><\/p>\n

Merkurius faser<\/h2>\n

\"\"<\/a>Jag letade efter info om vem som f\u00f6rst fastslog att Merkurius uppvisade faser. Galilei <\/strong>var snubblande n\u00e4ra men riktigt s\u00e4kra blev vi inte f\u00f6rr\u00e4n 1639, allts\u00e5 n\u00e4stan trettio \u00e5r efter det att Galilei riktat sitt lilla l\u00e5gf\u00f6rstornde teleskop mot himlavalvet.<\/p>\n

Den definitive uppt\u00e4ckaren hette Giovanni Battista Zupi<\/strong> eller\u00a0 Zupus och var en av dessa duktiga, observerande Jesuitpr\u00e4ster som var med om att krossa den gamla v\u00e4rldsbilden – trots den egna kyrkans motst\u00e5nd.<\/p>\n

En fyrkantig fullm\u00e5ne!<\/h2>\n
\"\"<\/a>
M\u00e5nfotot togs vid Colville River Delta i Canada av James Helmericks<\/figcaption><\/figure>\n

Den konstigaste bilden av l\u00f6rdagsfullm\u00e5nen se vi h\u00e4r. P\u00e5 spaceweather.com finns en direkt m\u00e4rklig fyrkantig superm\u00e5ne<\/a>, fotograferad i Alaska av James Helmericks<\/strong>. \u00d6verraskad \u00e4r inte ordet f\u00f6r det han s\u00e5g, tyckte och t\u00e4nkte.<\/p>\n

Jag t\u00e4nkte ett tag att han m\u00f6jligen fotat fullm\u00e5nen genom backspegeln i sin bil, men s\u00e5 var det inte.Detta var vad han s\u00e5g!<\/p>\n

En expert p\u00e5 optiska fenomen i atmosf\u00e4ren beskriver f\u00f6r sajten\u00a0 fenomenet som resultat av en h\u00e4gring typ “fata morgana”<\/a>, som ger s\u00e5na h\u00e4r effekter till f\u00f6ljd av olika varma luftlager. Fenomenet \u00e4r speciellt vanligt i arktiska trakter, n\u00e4ra horisonten.<\/p>\n","protected":false},"excerpt":{"rendered":"

Fr\u00e5n exoplanet till brun stj\u00e4rna… och tillbaka igen? F\u00f6r att demonstrera likheterna i den flytande gr\u00e4nsen mellan sm\u00e5 bruna dv\u00e4rgar och stora gasplaneter, har gamle MARS:ianen Arne Lindengard agerat detektiv och s\u00f6kt p\u00e5 n\u00e4tet efter koordinaterna f\u00f6r det senast uppt\u00e4ckta ultrakalla stj\u00e4rnsystemet (se f\u00f6rra bloggen): – L\u00e4s och h\u00e4pna, det finns med i katalogen \u00f6ver… L\u00e4s mer »Nr 77 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":[],"_links":{"self":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/12017"}],"collection":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/comments?post=12017"}],"version-history":[{"count":20,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/12017\/revisions"}],"predecessor-version":[{"id":12042,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/12017\/revisions\/12042"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=12017"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=12017"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=12017"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}