(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.