[IAUC] CBET 4201: 20151124 : (3433) FEHRENBACH

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                                                  Electronic Telegram No. 4201
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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(3433) FEHRENBACH
     D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, Ondrejov Observatory; A. Marchini, F. Salvaggio, and R. Papini,
Dipartimento di Scienze Fisiche, Della Terra e Dell'Ambiente, University of
Siena; J. Pollock, D. Caton, and R. Hawkins, Appalachian State University
(ASU); V. Benishek, Belgrade Astronomical Observatory; A. Smith, Gemini
North; and D. Reichart and J. Haislip, University of North Carolina at
Chapel Hill, report that photometric observations taken with a 0.50-m
telescope (+ SBIG ST-10XME camera) at the Sugarloaf Mountain Observatory,
a 0.30-m telescope (+ SBIG STL-6303 camera) at the Astronomical Observatory
of the University of Siena, a 0.35-m telescope (+ Apogee Alta U47+ camera)
at the ASU's Dark Sky Observatory near Boone, NC, USA, and a 0.35-m telescope
(+ SBIG ST-8 camera)at the Sopot Observatory in Serbia during Oct. 31-Nov. 21
reveal that minor planet (3433) is a binary system with an orbital period of
19.665 +/- 0.005 hr.  The primary shows a period of 3.9160 +/- 0.0003 hr and
has a lightcurve amplitude of 0.27 mag at solar phases 6-11 degrees.  Mutual
eclipse/occultation events that are 0.10- to 0.17-magnitude deep indicate the
secondary-to-primary mean-diameter ratio of 0.31.  The secondary is
synchronous, and it has an amplitude of 0.03 mag in the observed lightcurve,
suggesting a secondary elongation of about 1.3 after removing contribution of
light from the primary.  The system's total V magnitude ranged between 14.2
and 15.0 over the observing run.


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                         (C) Copyright 2015 CBAT
2015 November 24                 (CBET 4201)              Daniel W. E. Green