Observations of 1 Ceres and 2 Pallas at centimeter wavelengths

Details Observations of 1 Ceres and 2 Pallas at centimeter wavelengths Observations of 1 Ceres and 2 Pallas at centimeter wavelengths

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1593j&link_type=abstract

Astronomical Journal, vol. 87, Nov. 1982, p. 1593-1599.

Astronomy and Astrophysics

Astronomy

15

Asteroids, Astronomical Spectroscopy, Centimeter Waves, Ceres Asteroid, Radiant Flux Density, Antenna Arrays, Astrometry, Black Body Radiation, Brightness Temperature, Radio Spectra, Asteroids, Ceres, Pallas, Astronomy, Observations, Centimeter Waves, Wavelengths, Flux, Density, Distance, Diameters, Brightness Temperature, Comparisons, Optical Properties

Scientific paper

Observations of the minor planets 1 Ceres and 2 Pallas are presented, as performed with the VLA during May and December 1981. At a distance of 2.8 AU, 1 Ceres measured flux densities were 348 + or - 35 micro Jy at 6 cm (May 18, 1981) and 3720 + or - 370 micro Jy at 2 cm (May 19, 1981); at a distance of 2.9 AU, the minor planet measured flux density was 356 + or - 36 micro Jy at 6 cm (Dec. 26, 1981). Two Pallas flux density measurements at 2.2 AU on Dec. 29, 1981 was 320 + or - 32 micro Jy. It appears that the brightness temperature of 1 Ceres is lower than expected for a rapidly rotating blackbody (based on currently accepted diameters) and that of 2 Pallas is near the expected value. In addition, it is indicated by the observed temperature that the diameter of 1 Ceres is 818 + or - 82 km. Finally, 1 Ceres position was found to deviate from the predicted optical position by - 0.3 sec + or - 0.1 sec, and the 2 Pallas deviation was found to be 0.8 sec + or - 0.1 sec.

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