{"id":84465,"date":"2020-06-16T18:02:18","date_gmt":"2020-06-16T17:02:18","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=84465"},"modified":"2020-06-18T13:37:38","modified_gmt":"2020-06-18T12:37:38","slug":"nr-51-2020","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2020\/06\/16\/nr-51-2020\/","title":{"rendered":"Nr 51 2020"},"content":{"rendered":"\n

Unik parallaxm\u00e4tning fr\u00e5n New Horizons<\/h2>\n\n\n\n

Lite astronomihistoria handlar det onekligen om:  22-23 april i \u00e5r tog den med tiden fram\u00f6ver alltmer interstell\u00e4rt vandrande  Nasa-sonden New Horizons (Pluto h\u00e4rom \u00e5ret, remember?) ett par bilder in mot Vintergatan, som visar p\u00e5 intressanta exempel p\u00e5 parallaxeffekten: <\/a><\/p>\n\n\n\n

I fokus var dels stj\u00e4rnan Proxima Centauri, dels Wolf 359.<\/p>\n\n\n\n

Stj\u00e4rnhimlen ser annorlunda ut fr\u00e5n New Horizons “horisont” \u00e4n f\u00f6r oss h\u00e4r p\u00e5 jorden. Fixstj\u00e4rnor tillh\u00f6r sagans rike, allt r\u00f6r sig, inte ens stj\u00e4rnbilderna \u00e4r  statiska, allt \u00e4r som de gamla grekerna sa “panta rei”.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Proxima Centauri sedd fr\u00e5n tv\u00e5 h\u00e5ll.<\/em><\/p>\n\n\n\n

Baslinjen mellan jorden och New Horizon var vi fototillf\u00e4llet 7 miljarder kilometer. P\u00e5 jorden tog samtidigt robotteleskop i Australien och Arizona sina bilder.<\/p>\n\n\n\n

I pressmesset fr\u00e5n New Horizons-teamet uppt\u00e4cks att bakom  nyheten ligger \u00e4ven Brian May<\/strong>, den rockande astronomen i  Queens.<\/p>\n\n\n\n

F\u00f6rsta g\u00e5ngen en verifierbar stj\u00e4rnparallax uppm\u00e4ttes fr\u00e5n jorden var 1838. Redan Tycho Brahe <\/strong>f\u00f6rs\u00f6kte sig p\u00e5 uppgiften men misslyckades.<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n\n\n\n

Upphittat: Litium i \u00e4nnu en cepheid<\/h2>\n\n\n\n

\u00c4nnu en litiumrik cepheid har hittats i Vintergatan<\/a>, och det \u00e4r en st\u00f6rre sensation \u00e4n vad vi kanske inbillar oss. Hittills har bara fem kandidater bekr\u00e4ftats.<\/p>\n\n\n\n

RS Oph p\u00e5 g\u00e5ng?<\/h2>\n\n\n\n

Den rekurrenta novan RS Ophiuchus v\u00e4ntas stiga i ljusstyrka, rapporteras h\u00e4r. <\/a><\/p>\n\n\n\n

SS Cyg diskuteras i unikt “webinar”<\/h2>\n\n\n\n

Det flaggas f\u00f6r ett s\u00e5 kallat “webinar” d\u00e4r SS Cyg-intresserade variabilister kan delta. Det \u00e4r ASTB:aren Magnus Larsson<\/strong>, som ligger bakom projektet – affischnamnet \u00e4r novaexperten  Deanne 
Coppejans<\/strong> fr\u00e5n Northwestern University, US.<\/p>\n\n\n\n

M\u00e5nen k\u00f6r\u00a0\u00f6ver Venus<\/h2>\n\n\n\n

P\u00e5 f\u00f6rmiddagen 19 juni (fredag) passerar m\u00e5nen Venus – sannerligen mitt p\u00e5 ljusa dan! <\/p>\n\n\n\n

Enligt n\u00e4tet kan det d\u00e5 se ut s\u00e5 h\u00e4r:<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Som Per Ahlin <\/strong>p\u00e5pekade i f\u00f6rra numret av Popul\u00e4r Astronomi <\/em>st\u00e5r Venus 23 gr fr\u00e5n solen och b\u00f6r kunna ses visuellt, st\u00e5 helst i skuggan,  men obs: Var f\u00f6rsiktig om du anv\u00e4nder kikare eller teleskop. Solen st\u00e5r farligt n\u00e4ra.<\/p>\n","protected":false},"excerpt":{"rendered":"

Unik parallaxm\u00e4tning fr\u00e5n New Horizons Lite astronomihistoria handlar det onekligen om:  22-23 april i \u00e5r tog den med tiden fram\u00f6ver alltmer interstell\u00e4rt vandrande  Nasa-sonden New Horizons (Pluto h\u00e4rom \u00e5ret, remember?) ett par bilder in mot Vintergatan, som visar p\u00e5 intressanta exempel p\u00e5 parallaxeffekten: I fokus var dels stj\u00e4rnan Proxima Centauri, dels Wolf 359. Stj\u00e4rnhimlen ser annorlunda ut fr\u00e5n… L\u00e4s mer »Nr 51 2020<\/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\/84465"}],"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=84465"}],"version-history":[{"count":17,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/84465\/revisions"}],"predecessor-version":[{"id":84491,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/84465\/revisions\/84491"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=84465"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=84465"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=84465"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}