Electronic Telegram No. 5083
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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Prepared using the Tamkin Foundation Computer Network


(2847) PARVATI
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; B. Warner, Center for Solar System Studies, Landers, CA, U.S.A.;
R. Durkee, Shed of Science South Observatory (SSSO), Pontotoc, TX, U.S.A.; R.
Goncalves, Instituto Politecnico de Tomar (IPT), Portugal; and F. Pilcher,
Organ Mesa Observatory, Las Cruces, NM, U.S.A., report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.35-m telescope at the Center for Solar System Studies, a 0.50-m telescope
at the SSSO, a 0.35-m telescope at the IPT's Linhaceira Observatory, and a
0.35-m telescope at the Organ Mesa Observatory during Sept. 3-Nov. 25 reveal
that minor planet (2847) is a binary system with an orbital period of 23.764
+/- 0.007 hr.  The primary shows a period of 2.6358 +/- 0.0002 hr and has a
lightcurve amplitude of 0.09 magnitude at solar phases 3-10 degrees,
suggesting a nearly spheroidal shape.  Mutual eclipse/occultation events that
are 0.06 to 0.12 magnitude deep indicate a secondary-to-primary mean-diameter
ratio of 0.24 +/- 0.02.  The secondary appears synchronous and has a light-
curve amplitude (combined primary-plus-secondary light curve) of 0.03 mag,
suggesting an elongated shape with an equatorial-axis ratio of 1.5 +/- 0.3.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2021 CBAT
2021 December 10                 (CBET 5083)              Daniel W. E. Green