(27675) 1981 CH
Abstract
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; P. Pravec, H. Kucakova, K. Hornoch, P. Kusnirak and J. Vrastil, Ondrejov Observatory; A. Carbognani, Astronomical Observatory of the Aosta Valley Autonomous Region, Italy; A. Aznar, Isaac Aznar Observatory, Centro Astronomico del Alto Turia, Aras de los Olmos, Spain; V. Benishek, Belgrade Astronomical Observatory; W. Cooney and J. Gross, Sonoita Research Observatory, Sonoita, AZ, U.S.A.; D. Terrell, Southwest Research Institute; and R. Montaigut and A. Leroy, OPERA Observatory, France, report that photometric observations taken with a 0.50-m telescope at the Sugarloaf Mountain Observatory, a 0.65-m telescope at the Ondrejov Observatory, a 0.81-m telescope at the Observatory of the Aosta Valley Autonomous Region, a 0.35-m telescope at the Isaac Aznar Observatory, a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.50-m telescope at the Sonoita Research Observatory, and a 0.20-m telescope at the OPERA Observatory during 2016 Dec. 21-2017 Feb. 1 reveal that minor planet (27675) is a binary system with an orbital period of 120.1 +/- 0.4 hr. The primary shows a period of 2.9661 +/- 0.0004 hr and has a lightcurve amplitude of 0.11 mag at solar phases 9-13 degrees, suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that are 0.04- to 0.06-magnitude deep indicate a lower limit on the secondary-to-primary mean-diameter ratio of 0.20.
- Publication:
-
Central Bureau Electronic Telegrams
- Pub Date:
- February 2017
- Bibcode:
- 2017CBET.4361....1P