{"id":85310,"date":"2020-08-20T14:56:49","date_gmt":"2020-08-20T13:56:49","guid":{"rendered":"http:\/\/www.astb.se\/cassiopeiabloggen\/?p=85310"},"modified":"2020-08-20T17:52:53","modified_gmt":"2020-08-20T16:52:53","slug":"nr-73-2020-2","status":"publish","type":"post","link":"https:\/\/www.astb.se\/cassiopeiabloggen\/2020\/08\/20\/nr-73-2020-2\/","title":{"rendered":"Nr 74 2020"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jordn\u00e4ra kyss mitt under supernovajakten<\/h2>\n\n\n\n<p>H\u00e5ll distansen, som FHM s\u00e4ger: Mitt under supernovajakten med Zwicky-instrumenteringen p\u00e5 Palomar Mountain, Californien, kunde h\u00e4rom dan noteras hur n\u00e4ra vi var en kyss n\u00e4r en asteroid pl\u00f6tsligt\u00a0kom fr\u00e5n solens h\u00e5ll och passerade jordklotet p\u00e5 avst\u00e5ndet av bara\u00a0en fj\u00e4rdedels jorddiameter &#8211; ett rekord s\u00e5 h\u00e4r l\u00e5ngt i NEO-projektet.<\/p>\n\n\n\n<p>Tack till <strong>Jesper Sollerman <\/strong>f\u00f6r tipset. Bilden nedan visar asteroiden 2020 QG n\u00e4r den ritar ett ljussp\u00e5r framf\u00f6r bakgrundsstj\u00e4rnorna. Bildenb tagen p\u00e5 Palomars h\u00f6jder:<\/p>\n\n\n<p><a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/?attachment_id=85319\" rel=\"attachment wp-att-85319\"><img decoding=\"async\" width=\"300\" height=\"214\" class=\"aligncenter size-medium wp-image-85319\" alt=\"\" src=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/2020_QG_2020_Aug_16_2020_10_23_08_UTC_with_cir.width-4501-300x214.png\" srcset=\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/2020_QG_2020_Aug_16_2020_10_23_08_UTC_with_cir.width-4501-300x214.png 300w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/2020_QG_2020_Aug_16_2020_10_23_08_UTC_with_cir.width-4501-200x143.png 200w, https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/08\/2020_QG_2020_Aug_16_2020_10_23_08_UTC_with_cir.width-4501.png 450w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n\n\n<p class=\"has-text-align-center\"><em>Bildk\u00e4lla:&nbsp; ZTF\/Caltech Optical Observatories<\/em><\/p>\n\n\n\n<p><a href=\"https:\/\/www.caltech.edu\/about\/news\/ztf-finds-closest-known-asteroid-fly-earth\">Alla fakta om h\u00e4ndelsen h\u00e4r.<\/a><\/p>\n\n\n\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<div class=\"nv-iframe-embed\"><iframe title=\"Asteroid 2020 QG&#039;s Earth flyby was the closest-known yet - Orbit animation\" width=\"1200\" height=\"675\" src=\"https:\/\/www.youtube.com\/embed\/IMUk4r95l9U?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe><\/div>\n<\/div><\/figure>\n\n\n\n<p>Om Zwicky-projektet ber\u00e4ttas i ett annat mess fr\u00e5n Jesper\u00a0 att han och hans supernovajagande kolleger inom The Zwicky Transient Facility (ZTF) Bright Transient Survey gemensamt bedriver den hittills st\u00f6rsta spektroskopiska SN-jakten. Sedan juni 2018 scannas norra natthimlen\u00a0av var tredje natt i tv\u00e5 filter och forskarna n\u00e5r alla variabla objekt ljusare utanf\u00f6r Vintergatan (exkluderande \u00e4ven galaxer med aktiva k\u00e4rnpartier, AGN)\u00a0\u00e4n magnituden 18,5-19,0.\u00a0\u00a0<\/p>\n\n\n\n<p>&#8220;We expect that by 2021 we will have completed a catalog of about 4000 ordinary supernovae and dozens to hundreds of &#8220;exotic&#8221; transients: tidal disruption events, superluminous supernovae, and the like. So far we have detected 3313 spectroscopically-confirmed supernovae and 38 additional spectroscopically-confirmed transients of other types. The large majority of these classifications were provided by our programs.&#8221;<\/p>\n\n\n\n<p>K\u00e4lla: <a href=\"https:\/\/www.astro.caltech.edu\/ztf\/bts\/bts.php\">https:\/\/www.astro.caltech.edu\/ztf\/bts\/bts.php<\/a><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jordn\u00e4ra kyss mitt under supernovajakten H\u00e5ll distansen, som FHM s\u00e4ger: Mitt under supernovajakten med Zwicky-instrumenteringen p\u00e5 Palomar Mountain, Californien, kunde h\u00e4rom dan noteras hur n\u00e4ra vi var en kyss n\u00e4r en asteroid pl\u00f6tsligt\u00a0kom fr\u00e5n solens h\u00e5ll och passerade jordklotet p\u00e5 avst\u00e5ndet av bara\u00a0en fj\u00e4rdedels jorddiameter &#8211; ett rekord s\u00e5 h\u00e4r l\u00e5ngt i NEO-projektet. Tack till&hellip;&nbsp;<a href=\"https:\/\/www.astb.se\/cassiopeiabloggen\/2020\/08\/20\/nr-73-2020-2\/\" rel=\"bookmark\">L\u00e4s mer &raquo;<span class=\"screen-reader-text\">Nr 74 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\/85310"}],"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=85310"}],"version-history":[{"count":23,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/85310\/revisions"}],"predecessor-version":[{"id":85336,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/85310\/revisions\/85336"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=85310"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=85310"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=85310"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}