Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994icar..111..489d&link_type=abstract
Icarus (ISSN 0019-1035), vol. 111, no. 2, p. 489-502
Astronomy and Astrophysics
Astronomy
14
Asteroids, Astronomy, Axes Of Rotation, Radio Observation, Rotation, Size (Dimensions), Surface Properties, Doppler Effect, Porosity, Radio Astronomy, Regolith, Spectrum Analysis, Thermal Emission
Scientific paper
We report of Goldstone-VLA, radar aperture-synthesis observations of the mainbelt asteroids 324 Bamberga and 7 Iris and the near-Earth asteroids 1991 EE and 4179 Toutatis. Simultaneous resolution of echoes in both angle and Doppler frequency provide new constraints on the mainbelt asteroids' pole directions: Bamberga's spin vector is within 40 deg of the south ecliptic pole, and the twofold ambiguity in Iris' pole direction (P. Magnusson, 1989) is resolved in favor of the ecliptic coordinates lambda = 15 deg, beta = +25 deg. For Bamberga, monostatic and bistatic radar echoes and VLA thermal-emission measurements, also reported here, are consistent with radiometric estimates of Bamberga's size and with the hypothesis that the asteroid is overlain by a regolith having a porosity of approximately 50%. Our near-Earth asteroid measurements required the development of new on-line VLA software that allows imaging of objects that are in the telescope's `near field.' This software has been successfully tested on Toutatis at a distance of 0.06 AU and will be essential for VLA observations of Earth-approaching comets.
de Pater Imke
Mitchell David Leroy
Ostro Steven J.
Palmer Patrick
Snyder Lewis E.
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