Fr\u00e5n The Astronomer\u00b4s Telegram uppf\u00e5ngar vi detta HST-bildbidrag<\/a>, f\u00f6rfattare Quanzhi Ye <\/strong>(U. Maryland) och Man-To Hui<\/strong> (U. Hawaii). Vi k\u00f6r p\u00e5 engelska i originalskicket:<\/p>\n\n\n “We report the continuing fragmentation of long-period comet C\/2019 Y4 (ATLAS), initially reported by ATel #13620, #13622, and #13629, with four major fragments designated A to D in MPEC 2020-H28 using ground-based observations up to UT 2020 April 18. Single-epoch observation with Hubble Space Telescope on UT 2020 April 20.5 (HST\/GO-16089, PI Ye) showed only two remaining major fragments, likely A and B in the Minor Planet Center identification, each consists of 1 to 2 brighter components and a couple more fainter components, situated 4 arcsec from each other along their common orbit. Fragments C and D seem to have been reduced into a handful of fainter fragments. At the time of the observation, the comet was at a heliocentric distance of 1.10 au and a geocentric distance of 0.98 au. A preliminary composite image can be found at https:\/\/www.astro.umd.edu\/~qye\/shared\/2019Y4_HST_20200420.png. <\/p>\n\n\n\n Tack till kompisen Christer Sv\u00e4rd <\/strong>som dokumenterat detta toppm\u00f6te \u00f6ver \u00c5hus: Venus ovan, m\u00e5nen nedan. Tittips: Dubbelklicka upp bilden p\u00e5 din sk\u00e4rm!<\/p>\n\n\n <\/p>","protected":false},"excerpt":{"rendered":" Kometen g\u00e5r itu Att n\u00e5got g\u00e5tt galet med ATLAS-kometen – eg. C\/2019 Y4 (ATLAS) –\u00a0det har vi ju f\u00f6rst\u00e5tt, om ingenting annat s\u00e5 visade ju H\u00e5kan Barreg\u00e5rds bild p\u00e5 den tilltagande fragmenteringen. Scrolla ner till H\u00e5kans bild h\u00e4r\u00a0i W-bloggen nr 31. Fr\u00e5n The Astronomer\u00b4s Telegram uppf\u00e5ngar vi detta HST-bildbidrag, f\u00f6rfattare Quanzhi Ye (U. Maryland) och… L\u00e4s mer »Nr 34 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\/83872"}],"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=83872"}],"version-history":[{"count":13,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/83872\/revisions"}],"predecessor-version":[{"id":83890,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/posts\/83872\/revisions\/83890"}],"wp:attachment":[{"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/media?parent=83872"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/categories?post=83872"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-json\/wp\/v2\/tags?post=83872"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}![\"\"](\"https:\/\/www.astb.se\/cassiopeiabloggen\/wp-content\/uploads\/2020\/04\/2019Y4_HST_202004201-300x195.png\")
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This research is based on observations made with the NASA\/ESA Hubble Space Telescope obtained from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with program HST GO 16089.”<\/p>\n\n\n\nToppm\u00f6te \u00f6ver \u00c5hus<\/h2>\n\n\n\n
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