Electronic Telegram No. 5515
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
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Prepared using the Tamkin Foundation Computer Network


(11934) LUNDGREN
     M. Conjat, Observatoire de la Cote d'Azur, Nice, France; J. F. Gout,
Starkville, MS, USA; D. Augustin, Anglet, France; and R. Behrend, Geneva
Observatory, Switzerland, report that photometric observations taken with
three telescopes (a 0.40-m telescope at the Nice Observatory; a 0.28-m
telescope at Starkville; and a 0.35-m telescope at the E-EyE observatory
outside of Fregenal de la Sierra, Spain) during 2025 Feb. 2-Feb. 27 reveal
that minor planet (11934) is a binary system with an orbital period of 18.612
+/- 0.002 hr.  The primary shows a period of 3.0822 +/- 0.0001 hr with
light-curve amplitude of 0.18 mag at solar phases 9-18 degrees.  Mutual
eclipse/occultation events that are 0.13 to 0.2 magnitude deep indicate a
lower limit on the secondary -to-primary mean-diameter ratio of 0.35.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2025 CBAT
2025 February 28                 (CBET 5515)              Daniel W. E. Green