[Iaude] CBET 4893: (1626) SADEYA

quai at eps.harvard.edu quai at eps.harvard.edu
Tue Dec 1 09:30:19 EST 2020

                                                  Electronic Telegram No. 4893
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

(1626) SADEYA
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; A. Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze
Fisiche, Della Terra e Dell'Ambiente, University of Siena; V. Chiorny, Kharkiv
Observatory; and M. Husarik, Skalnate Pleso Observatory, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.30-m telescope at the Astronomical Observatory of
the University of Siena, a 0.70-m telescope at the Chuguev station of the
Kharkiv Observatory in Ukraine, and a 0.61-m telescope at the Skalnate Pleso
Observatory during Aug. 1-Nov. 1 reveal that minor planet (1626) is a binary
system with an orbital period of 51.3 +/- 0.2 hr.  The primary shows a
period of 3.4202 +/- 0.0002 hr and has a light-curve amplitude of 0.16 mag at
solar phase 19 degrees, suggesting a nearly spheroidal shape.  Mutual
eclipse/occultation events that were 0.07 to 0.10 magnitude deep during Aug.
1-6 indicated a secondary-to-primary mean-diameter ratio of 0.26 +/- 0.02;
the events became partial and more shallow, with depth 0.04-0.05 magnitude
during Aug. 16-22, and they disappeared by Sept. 3, indicating that the
binary system moved out of eclipse/occultation geometry with respect to the
sun and the earth.

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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2020 CBAT
2020 December 1                  (CBET 4893)              Daniel W. E. Green

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