Precise flux density determination of 1 Ceres with the Heinrich-Hertz-Telescope at 250Hz.

Details Precise flux density determination of 1 Ceres with the Heinrich-Hertz-Telescope at 250Hz. Precise flux density determination of 1 Ceres with the Heinrich-Hertz-Telescope at 250Hz.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..953a&link_type=abstract

Astronomy and Astrophysics, v.309, p.953-956

Astronomy and Astrophysics

Astrophysics

11

Techniques: Photometric, Planets: 1 Ceres, Radio Continuum: Solar System, Telescopes

Scientific paper

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 Heinrich-Hertz-Telescope. 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%.

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