(2623) Zech
Abstract
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; P. Pravec, Ondrejov Observatory; V. Chiorny and Yu. N. Krugly, Kharkiv Observatory; V. Benishek, Belgrade Observatory; J. Pollock, D. B. Caton, A. B. Smith, and R. L. Hawkins, Appalachian State University; R. Inasaridze, Abastumani Observatory; R. Montaigut and A. Leroy, OPERA Observatory, France; and D. E. Reichart, J. B. Haislip and A. P. LaCluyze, University of North Carolina, Chapel Hill, report that photometric observations obtained during 2014 Oct. 7-31 reveal that minor planet (2623) is a binary system with an orbital period of 117.2 +/- 0.3 hr. The primary shows a period of 2.7401 +/- 0.0002 hr, and it has a lightcurve amplitude of 0.22 mag at solar phases 13-25 deg, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.09-magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.29. The secondary is non-synchronous, and it has a period of 18.718 +/- 0.008 hr and an amplitude of 0.08 mag in the observed lightcurve, suggesting a secondary elongation of about 2:1 after removing contribution of light from the primary.
- Publication:
-
Central Bureau Electronic Telegrams
- Pub Date:
- November 2014
- Bibcode:
- 2014CBET.4012....1P