Electronic Telegram No. 4039
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(20325) 1998 HO_27
     D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; V. Benishek, Belgrade Observatory; J.
Pollock, Appalachian State University; W. Cooney and J. Gross, Sonoita
Research Observatory; D. Terrell, Southwest Research Institute; D. E.
Reichart, J. B. Haislip and A. P. LaCluyze, University of North Carolina,
Chapel Hill; and A. Verveer and T. Spuck, Perth Observatory, report that
photometric observations obtained during 2014 Nov. 22-Dec. 20 reveal that
minor planet (20325) is a binary system with an orbital period of 23.54 +/-
0.01 hr.  The primary shows a period of 3.24474 +/- 0.00008 hr, and it has a
lightcurve amplitude of 0.13 mag, suggesting a nearly spheroidal shape.
Mutual eclipse/occultation events that are 0.09- to 0.19-magnitude deep
indicate a secondary-to-primary mean-diameter ratio of 0.30 +/- 0.02.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2014 CBAT
2014 December 24                 (CBET 4039)              Daniel W. E. Green