Electronic Telegram No. 512 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A. IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions) CBAT@CFA.HARVARD.EDU (science) URL http://cfa-www.harvard.edu/iau/cbat.html 2002 JF_56 R. Binzel, Massachusetts Institute of Technology, writes that ground-based photometric and spectroscopic observations are requested for 2002 JF_56, in support of the June 13 passage (at 100000 km) of the minor planet by the NASA New Horizons spacecraft, which will use the encounter for instrument calibration and testing of moving-target tracking. Possible photometric and spectroscopic measurements obtained by the spacecraft will be most useful if supported by ground-based observations. Interested observers may contact Binzel (rpb@mit.edu). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2006 CBAT 2006 May 18 (CBET 512) Daniel W. E. Green