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Our observational, data reduction, and shape-estimation techniques were nearly identical to those described in reference to asteroid 1580 Betulia by (25).
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Materials and methods are available as supporting material on Science Online
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Beta-Alpha delay-Doppler differences from our 1 and 2 June 2002 observations are fit acceptably well by an orbit estimated from just the May 2001 observations if we allow for a 189° adjustment to the 2002 orbital phase.
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The Arecibo delay residuals reveal a systematic bias possibly involving a several-decameter error in the nominal geodetic location of the telescope's reference point. The Goldstone astrometric measurements seem free from such a bias and provide much better orbital-phase coverage and twice the time base of the Arecibo astrometry.
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The radar predictions for the 5un-Earth-Alpha-Beta geometry at the photometric mutual event epochs establish that all the mutual events observed in June were eclipses (of Alpha on 3, 6, and 11 June and of Beta on 7 and 12 June).
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33751579574
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We thank the technical staffs of the Arecibo Observatory and the Goldstone 5olar 5ystem Radar for help with the observations. 5ome of this work was performed at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under contract with NASA. This material is based in part on work supported by NASA under the 5cience Mission Directorate Research and Analysis Programs. The Arecibo Observatory is part of the National Astronomy and Ionosphere Center, which is operated by Cornell University under a cooperative agreement with the N5F. Research at the University of Michigan was supported by NASA's Planetary Geology and Geophysics Program, by the JPL/Caltech Director's Research and Development Fund, and by the Air Force Office of 5cientific Research. J.L.M. was supported in part by NASA grant NNG04GN31G. C.M. was partially supported by N5F grant AST-0205975. The work at Ondřejov was supported by the Grant Agency of the Czech Republic (grant 205/05/0604).
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