[Iaude] CBET 4599: 20190116 : (2070) HUMASON

quai at eps.harvard.edu quai at eps.harvard.edu
Wed Jan 16 11:08:58 EST 2019

                                                  Electronic Telegram No. 4599
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau at eps.harvard.edu (alternate cbat at iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network

(2070) HUMASON
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; and
V. Chiorny, Kharkiv Observatory, report that photometric observations obtained
with a 0.35-m telescope at the Sopot Observatory in Serbia, a 0.35-m telescope
at the Organ Mesa Observatory, and a 0.70-m telescope at the Chuguev station
of the Kharkiv Observatory in Ukraine during 2018 Oct. 13-Nov. 2 reveal that
minor planet (2070) is a binary system with an orbital period of 53.5 +/- 0.1
hr.  The primary shows a period of 3.1883 +/- 0.0005 hr and has a light-curve
amplitude of 0.15 mag at solar phases 1-3 degrees, suggesting a nearly
spheroidal shape.  Mutual eclipse/occultation events that are 0.10- to 0.15-
magnitude deep indicate a secondary-to-primary mean-diameter ratio of 0.31
+/- 0.02.

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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2019 CBAT
2019 January 16                  (CBET 4599)              Daniel W. E. Green

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