Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989icar...78..382o&link_type=abstract
Icarus (ISSN 0019-1035), vol. 78, April 1989, p. 382-394.
Astronomy and Astrophysics
Astronomy
10
Asteroids, Astrometry, Orbital Mechanics, Radar Astronomy, Radar Echoes, Albedo, Astronomical Photometry, Circular Polarization, Radar Cross Sections, Asteroids, Radar Methods, Earth-Based Observations, 1986Jk, Polarization, Surface, Roughness, Shape, Physical Properties, Orbits, Rotation, Density, Doppler Methods, Reflectivity, Calculations, Orbital Elements, Ephemerides, Characteristics, Astronomy, Procedure, Data Reduction
Scientific paper
The asteroid 1986 JK was observed with a 3.5 cm-wavelength radar in May and June, 1986, at less than 0.029 AU; its radar echo power circular polarization ratio indicates single backscattering from smooth surface elements. A working model constructed for the asteroid in light of these radar data postulates a 1-2 km object whose shape has little elongation and some polar flattening. Orbital and physical characteristics are rather cometlike. The radar astrometric data obtained are noted to be extremely powerful for orbit-improvement, so that a search ephemeris whose uncertainty is an order-of-magnitude smaller than that based on relevant optical data alone can be prepared by combining optical and radar data.
Chodas Paul W.
Goldstein Raymond M.
Jurgens Raymond F.
Ostro Steven J.
Thompson William T.
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