Electronic Telegram No. 4101
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


(4514) VILEN
       D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.;
P. Pravec, K. Hornoch, P. Kusnirak, J. Vrastil and H. Kucakova, Ondrejov
Observatory; V. Chiorny and V. Shevchenko, Kharkiv Observatory; V. Reddy,
Planetary Science Institute, Tucson; W. Cooney and J. Gross, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; and D. Terrell, Southwest Research
Institute, report that photometric observations obtained during Apr. 16-May 12
reveal that minor planet (4514) is a binary system with an orbital period of
16.85 +/- 0.01 hr.  The primary shows a period of 2.89224 +/- 0.00009 hr, and
it has a lightcurve amplitude of 0.09 mag at solar phases 8-14 deg, suggesting
a nearly spheroidal shape.  Mutual eclipse/occultation events that are 0.07-
to 0.14-magnitude deep indicate a lower limit on the secondary-to-primary
mean-diameter ratio of 0.26.
      V. Reddy, D. Takir and J. A. Sanchez, Planetary Science Institute,
Tucson; and P. S. Hardersen, University of North Dakota, Grand Forks, report
that near-infrared spectroscopic observations (0.7-2.5 microns) of minor
planet (4514), obtained on 2015 Apr. 25 using the NASA Infrared Telescope
Facility on Mauna Kea, show that it is an X/M-type minor planet with a weak
pyroxene absorption band at 1 micron.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2015 CBAT
2015 May 22                      (CBET 4101)              Daniel W. E. Green