(2019) VAN ALBADA
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov Observatory; R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; M. Husarik, M. Pikler, G, Cervak, and D. Tomko, Skalnate Pleso Observatory; B. Christmann, Soucieu-en-Jarrest, France; A. Aznar, Isaac Aznar Observatory, Alcublas, Valencia, Spain; D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; V. Chiorny, Kharkiv Observatory; and A. Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della Terra e Dell’Ambiente, University of Siena, report that photometric observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at the Shed of Science South Observatory, a 0.61-m telescope at the Skalnate Pleso Observatory, 0.28-m telescope at Soucieu-en-Jarrest, a 0.35-m telescope at the Isaac Aznar Observatory, a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.35-m telescope at the Organ Mesa Observatory, a 0.70-m telescope at the Chuguev station of the Kharkiv Observatory in Ukraine, and a 0.30-m telescope at the Astronomical Observatory of the University of Siena during Sept. 22-Oct. 26 reveal that minor planet (2019) is a binary system with an orbital period of 17.982 +/- 0.003 hr. The primary shows a period of 2.7294 +/- 0.0005 hr and has a lightcurve amplitude of 0.16 magnitude at solar phases 2-3 degrees. Mutual eclipse/occultation events that are 0.07 to 0.12 magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.26.
NOTE: These ‘Central Bureau Electronic Telegrams’ are sometimes superseded by text appearing later in the printed IAU Circulars.
(C) Copyright 2019 CBAT
2019 October 30 (CBET 4689) Daniel W. E. Green