Electronic Telegram No. 1150 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://www.cfa.harvard.edu/iau/cbat.html (1453) FENNIA B. D. Warner, Palmer Divide Observatory, Colorado Springs, CO; A. W. Harris, Space Science Institute; P. Pravec, Ondrejov Observatory; R. D. Stephens, Goat Mountain Astronomical Research Station, Yucca Valley, CA; D. Pray, Carbuncle Hill Observatory, Greene, RI; W. Cooney, J. Gross, and D. Terrell, Sonoita Research Observatory, Sonoita, AZ; S. Gajdos and A. Galad, Modra Observatory; and Yu. Krugly, Institute of Astronomy of Kharkiv National University, Main Astronomical Observatory of National Academy of Science of Ukraine, report that photometric observations made during Nov. 4-23 reveal that minor planet (1453) is a binary system with an orbital period of 22.99 +/- 0.01 hr. The primary shows a period of 4.4121 +/- 0.0001 hr, and it has a lightcurve amplitude of 0.18 mag, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.28 +/- 0.02. NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2007 CBAT 2007 December 1 (CBET 1150) Daniel W. E. Green