Precise flux density determination of 1 Ceres with the HeinrichHertzTelescope at 250Hz.
Abstract
During 6 days in April 1995 we have measured the intensity ratio of the planet Mars and the asteroid Ceres at a frequency of 250GHz with a wideband bolometer at the HeinrichHertzTelescope. From 58 pairs of observations, the derived flux density ratio of Mars and Ceres is 268.5, corrected for the partial resolution of Mars on April 10, 1995. This corresponds to a flux density of 2.35Jy for Ceres at this date. The brightness variation with the rotation phase is smaller than +/2%. With the assumption of emissivity=1 we derive a diameter for Ceres of 963.0km. With this diameter and the computed equilibrium temperature, the absolute flux density of Ceres can be predicted to an accuracy better than 3%.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 May 1996
 Bibcode:
 1996A&A...309..953A
 Keywords:

 TECHNIQUES: PHOTOMETRIC;
 PLANETS: 1 CERES;
 RADIO CONTINUUM: SOLAR SYSTEM;
 TELESCOPES