Electronic Telegram No. 5124
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
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Prepared using the Tamkin Foundation Computer Network


(4494) MARIMO
     V. Benishek, Belgrade Astronomical Observatory; P. Pravec, H. Kucakova,
K. Hornoch, and P. Kusnirak, Ondrejov Observatory; A. Aznar, Isaac Aznar
Observatory, Alcublas, Valencia, Spain; A. Leroy, Association T60, Toulouse,
France; and R. Durkee, Shed of Science South Observatory, Pontotoc, TX, USA,
report that photometric observations taken with a 0.35-m telescope at the
Sopot Observatory in Serbia, a 0.65-m telescope at the Ondrejov Observatory,
a 0.35-m telescope at the Isaac Aznar Observatory, a 0.50-m telescope at Pic
du Midi Observatory, and a 0.50-m telescope at the Shed of Science South
Observatory during Jan. 14-Mar. 27 reveal that minor planet (4494) is a
binary system with an orbital period of 24.73 +/- 0.02 hr.  The primary
shows a period of 4.1209 +/- 0.0002 hr and has a lightcurve amplitude of 0.12
magnitude at solar phases 0.4-10.5 degrees, suggesting a nearly spheroidal
shape.  Mutual eclipse/occultation events that are 0.15 magnitude deep
indicate a lower limit on the secondary-to-primary mean-diameter ratio of
0.38.  The mean absolute R magnitude in the Cousins system is H_R = 13.28
+/- 0.15, assuming the phase-relation slope parameter G = 0.24 +/- 0.11.


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2022 May 19                      (CBET 5124)              Daniel W. E. Green