[Iaude] CBET 4523: 20180609 : (15745) YULIYA

[quai at eps.harvard.edu]

                                                  Electronic Telegram No. 4523
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(15745) YULIYA
     A. Aznar, Observatorio Isaac Aznar, Aras de los Olmos, Spain; O.
Vaduvescu, Isaac Newton Group and Instituto de Astrofisica de Canarias,
Spain; T. Wilson, Isaac Newton Group and University College, London; T.
Zegmott, Isaac Newton Group and University of Kent; and P. Pravec, Ondrejov
Observatory, report that photometric observations taken within the "European
Near Earth Asteroids Research" (EURONEAR) program with the 2.5-m Isaac
Newton Telescope and the 1.2-m Mercator telescope hosted at Roque de los
Muchachos Observatory (La Palma, Canary Islands, Spain) during Apr. 26-May 6
reveal that minor planet (15745) is a binary system with an orbital period
of 15.63 +/- 0.02 hr.  The primary shows a period of 3.2486 +/- 0.0003 hr
and has a lightcurve amplitude of 0.10 mag at solar phases 35.1-35.2 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events that
are 0.15- to 0.21-magnitude deep indicate a lower limit on the secondary-
to-primary mean-diameter ratio of 0.43.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2018 CBAT
2018 June 9                      (CBET 4523)              Daniel W. E. Green