Electronic Telegram No. 4200
Central Bureau for Astronomical Telegrams
Mailing address:  Hoffman Lab 209; Harvard University;
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(5425) VOJTECH
    R. D. Stephens, Landers, CA, USA; and B. D. Warner, Eaton, CO, USA,
report that CCD photometric observations, made between Oct. 25 and Nov. 19
with their Center for Solar System Studies 0.35-m Schmidt-Cassegrain telescope
(+ Finger Lakes Instruments Microline 1001e camera) at Landers, show that
minor planet (5425) is a binary system with an orbital period of 25.43 +/-
0.02 hr.  The lightcurve of the primary has a period of 2.64759 +/- 0.000004
hr with an amplitude of 0.27 +/- 0.02 mag; its V magnitude ranged from 15.79
to 15.42 over the observing run.  Assuming an equatorial view of the primary,
this indicates that it is an elongated body with an a/b axial ratio of
about 1.3:1.  The depth of the mutual events ranges from 0.05 to 0.08 mag.
The depth of the secondary event gives a lower limit for the effective
secondary-to-primary diameter ratio of Ds/Dp = 0.22 +/- 0.02.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 November 24                 (CBET 4200)              Daniel W. E. Green