{"id":38702,"date":"2025-07-08T10:56:47","date_gmt":"2025-07-08T08:56:47","guid":{"rendered":"https:\/\/karmaka.de\/?p=38702"},"modified":"2025-07-08T10:56:48","modified_gmt":"2025-07-08T08:56:48","slug":"a-portrait-throughout-perihelion-of-the-nh2-rich-interstellar-comet-2i-borisov","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=38702","title":{"rendered":"A portrait throughout perihelion of the NH2-rich interstellar comet 2I\/Borisov<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Sophie E. Deam, Michele T. Bannister, Cyrielle Opitom, Matthew M. Knight, Ryan Ridden-Harper, Darryl Z. Seligman, Alan Fitzsimmons, Aur\u00e9lie Guilbert-Lepoutre, Emmanuel Jehin, Laurent Jorda, Michael Marsset, Youssef Moulane, Philippe Rousselot, Pierre Vernazza, Bin Yang<\/p>\n\n\n\n<p>Submitted to PSJ, Draft version July 8, 2025<\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/pdf\/2507.05051\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The interstellar comet 2I\/Borisov is the first interstellar object where compositional characterisation was possible throughout its entire perihelion passage. We report all 16 epochs of a comprehensive optical observation campaign with ESO VLT&#8217;s integral field spectrograph MUSE, spanning 126 days from 2019 November 14 to 2020 March 19. The spatial dust emission of 2I\/Borisov was predominantly smooth, with no seasonal effect. A jet-like feature was consistently visible. The gas production morphology of its coma was also smooth and similar for C2, NH2, and CN:: symmetric around the photocentre. The production rates of these species gently declined into and beyond perihelion, until 2I&#8217;s outburst and splitting event in early 2020 March. C2, NH2, and CN: production rates all increased, with NH2 being the most significant; the dust emission also slightly reddened. 2I\/Borisov is a carbon-depleted, relatively NH2-rich comet when compared to those comets yet measured in the Solar System.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Sophie E. Deam, Michele T. Bannister, Cyrielle Opitom, Matthew M. Knight, Ryan Ridden-Harper, Darryl Z. Seligman, Alan Fitzsimmons, Aur\u00e9lie Guilbert-Lepoutre, Emmanuel Jehin, Laurent Jorda, Michael Marsset, Youssef Moulane, Philippe Rousselot, Pierre Vernazza, Bin Yang Submitted&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[179],"tags":[5942,1870,6033],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38702"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=38702"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38702\/revisions"}],"predecessor-version":[{"id":38703,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/38702\/revisions\/38703"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=38702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=38702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=38702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}