Electronic Telegram No. 5435
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(761) BRENDELIA
     M. Colazo, Poznan Astronomical Observatory; C. Colazo, Cordoba,
Argentina; V. Amelotti, Alta Gracia, Argentina; R. Melia, Carlos Paz,
Argentina; N. Suarez, Pilar, Argentina; F. Santos, Piconcillo, Spain; B.
Monteleone and G. Ciancia, Reggio Calabria, Italy; A. Wilberger, Santa Rosa de
La Pampa, Argentina; M. Morales, Mallorca, Spain; and M. Anzola, Cordoba,
report that photometric observations taken with a 250-mm telescope at Alta
Gracia, a 254-mm telescope at Carlos Paz, a 254-mm telescope at Pilar, a
203-mm telescope at Piconcillo, 250- and 400-mm telescopes at Reggio Calabria,
a 200-mm telescope at Santa Rosa de La Pampa, a 250-mm telescope at Mallorca,
and a 150-mm telescope at Cordoba during 2024 July 24-Aug. 5 reveal that minor
planet (761) is a binary system with an orbital period of 57.079 +/- 0.016 hr.
Mutual eclipse/occultation events that are 0.6- to 0.8-magnitude deep suggest
that both components are of similar sizes.  This configuration also suggests
that the pair has reached tidal coupling, which would explain why their
rotation periods are both 58 hours.  Eclipses are occurring every 29 hours.
To date, the group has observed five eclipses.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2024 CBAT
2024 August 21                   (CBET 5435)              Daniel W. E. Green