IAU CBET 4565<\/p>\n
(100015) 1989 SR7
\nV. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
\nK. Hornoch, and P. Kusnirak, Ondrejov Observatory; J. Oey, Blue Mountains
\nObservatory, Leura, NSW, Australia; R. Groom, Darling Range Observatory,
\nPerth, Western Australia; A. Aznar, Astronomia Para Todos Observatories Group,
\nSpain; and A. Sota, Observatorio de Sierra Nevada, Instituto de Astrofisica de
\nAndalucia-CSIC, report that photometric observations taken with a 0.35-m
\ntelescope at the Sopot Observatory in Serbia, a 0.65-m telescope at the
\nOndrejov Observatory, a 0.35-m telescope at the Blue Mountains Observatory, a
\n0.30-m telescope at the Darling Range Observatory, and a 0.90-m telescope at
\nthe Sierra Nevada Observatory during Sept. 9-Oct. 12 reveal that minor planet
\n(100015) is a binary system with an orbital period of 20.65 \u00c2\u00b1 0.01 hr. The
\nprimary shows a period of 2.4172 \u00c2\u00b1 0.0002 hr and has a lightcurve amplitude
\nof 0.05 mag at solar phases 7-22 degrees, suggesting a nearly spheroidal
\nshape. Mutual eclipse\/occultation events that are 0.13 to 0.21 magnitude deep
\nindicate a secondary-to-primary mean-diameter ratio of 0.35 \u00c2\u00b1 0.02. The
\nmean absolute R magnitude in the Cousins system is H_R = 15.55 \u00c2\u00b1 0.11,
\nassuming the phase-relation slope parameter G = 0.24 \u00c2\u00b1 0.11.<\/p>\n
2018 October 23,\u00a0 Daniel W. E. Green<\/p>\n
http:\/\/www.cbat.eps.harvard.edu\/cbet\/RecentCBETs.html<\/p>\n","protected":false},"excerpt":{"rendered":"
IAU CBET 4565 (100015) 1989 SR7 V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova, K. Hornoch, and P. Kusnirak, Ondrejov Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia; R. Groom, Darling Range Observatory, Perth, Western Australia; A. Aznar, Astronomia Para Todos Observatories Group, Spain; and A. Sota, Observatorio de Sierra Nevada, Instituto de […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[7],"tags":[],"class_list":["post-496","post","type-post","status-publish","format-standard","hentry","category-papers-and-letters"],"acf":[],"_links":{"self":[{"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/posts\/496","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/aptog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=496"}],"version-history":[{"count":4,"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/posts\/496\/revisions"}],"predecessor-version":[{"id":500,"href":"https:\/\/aptog.com\/index.php?rest_route=\/wp\/v2\/posts\/496\/revisions\/500"}],"wp:attachment":[{"href":"https:\/\/aptog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=496"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/aptog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=496"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/aptog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=496"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}