{"id":21590,"date":"2020-03-02T13:43:25","date_gmt":"2020-03-02T12:43:25","guid":{"rendered":"http:\/\/karmaka.de\/?p=21590"},"modified":"2020-03-04T19:05:38","modified_gmt":"2020-03-04T18:05:38","slug":"photometry-of-kuiper-belt-object-486958-arrokoth-from-new-horizons-lorri","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=21590","title":{"rendered":"Photometry of Kuiper belt object (486958) Arrokoth from New Horizons LORRI<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Jason D. Hofgartner, Bonnie J. Buratti, Susan D. Benecchi, Ross A. Beyer, Andrew Chenge, James T. Keane, Tod R. Lauer, Catherine B. Olkin, Joel W. Parker, Kelsi N. Singer, John R. Spencer , S. Alan Stern, Anne J. Verbiscer, Harold A.Weaver, New Horizons Geology, Geophysics Team, New Horizons LORRI Team<\/p>\n\n\n\n<p>Icarus<\/p>\n\n\n\n<p><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0019103520301147\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK<\/strong><\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/arxiv.org\/ftp\/arxiv\/papers\/2003\/2003.01224.pdf\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p>&#8220;Highlights<\/p>\n\n\n\n<p>\u2022    Geometric albedo\u202f&gt;\u202fthan mean but consistent with distribution of cold classical KBOs.<br>\n\u2022    Maps of normal reflectance &amp; hemispherical albedo of Arrokoth&#8217;s surface are presented.<br>\n\u2022    Normal reflectance of Arrokoth varies with location with \u2248Gaussian distribution.<br>\n\u2022    Normal reflectance distributions of Arrokoth&#8217;s two lobes are very similar.<br>\n\u2022    Hemispherical albedo varies substantially with both incidence angle and location.&#8221;<\/p>\n\n\n\n<p>&#8220;On January 1st 2019, the New Horizons spacecraft flew by the classical Kuiper belt object (486958) Arrokoth (provisionally designated 2014 MU69), possibly the most primitive object ever explored by a spacecraft. The I\/F of Arrokoth is analyzed and fit with a photometric function that is a linear combination of the Lommel-Seeliger (lunar) and Lambert photometric functions. Arrokoth has a geometric albedo of pv\u202f=\u202f0.21\u22120.04+0.05 at a wavelength of 550\u202fnm and \u22480.24 at 610\u202fnm. Arrokoth&#8217;s geometric albedo is greater than the median but consistent with a distribution of cold classical Kuiper belt objects whose geometric albedos were determined by fitting a thermal model to radiometric observations. Thus, Arrokoth&#8217;s geometric albedo adds to the orbital and spectral evidence that it is a cold classical Kuiper belt object. Maps of the normal reflectance and hemispherical albedo of Arrokoth are presented. The normal reflectance of Arrokoth&#8217;s surface varies with location, ranging from \u22480.10\u20130.40 at 610\u202fnm with an approximately Gaussian distribution. Both Arrokoth&#8217;s extrema dark and extrema bright surfaces are correlated to topographic depressions. Arrokoth has a bilobate shape and the two lobes have similar normal reflectance distributions: both are approximately Gaussian, peak at \u22480.25 at 610\u202fnm, and range from \u22480.10\u20130.40, which is consistent with co-formation and co-evolution of the two lobes. The hemispherical albedo of Arrokoth varies substantially with both incidence angle and location, the average hemispherical albedo at 610\u202fnm is 0.063\u202f\u00b1\u202f0.015. The Bond albedo of Arrokoth at 610\u202fnm is 0.062\u202f\u00b1\u202f0.015.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Jason D. Hofgartner, Bonnie J. Buratti, Susan D. Benecchi, Ross A. Beyer, Andrew Chenge, James T. Keane, Tod R. Lauer, Catherine B. Olkin, Joel W. Parker, Kelsi N. Singer, John R. Spencer , S. Alan&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[621,1513,181],"tags":[5470,1768,5469,1890,2110,1479],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21590"}],"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=21590"}],"version-history":[{"count":2,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21590\/revisions"}],"predecessor-version":[{"id":21597,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21590\/revisions\/21597"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}