Cometary mass determination

Details Cometary mass determination Cometary mass determination

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jansc..29...19y&link_type=abstract

Journal of the Astronautical Sciences, vol. 29, Jan.-Mar. 1981, p. 19-33.

Physics

2

Acceleration (Physics), Comets, Error Analysis, Gravitational Effects, Space Rendezvous, Spacecraft Tracking, Weight Measurement, Drag, Polystation Doppler Tracking System, Radiation Pressure, Solar Gravitation, Solar Radiation, Spacecraft Motion, Stochastic Processes, Tempel 2 Comet

Scientific paper

An error analysis shows that a mass determination to better than 15% is possible with a single, 2 m/s flyby within 100 km of the comet Tempel 2 just before its perihelion passage. Data arc lengths, measurement accuracy and data type, spacecraft trajectory state uncertainty, flyby distance and velocity, the cometary model, and outgassing (drag) effects were examined for their influence on mass determination accuracy, and Doppler tracking data were found superior to spacecraft-comet ranging. Whether the two methods of altimetry were processed alone or in combination, the results were strongly sensitive to the state uncertainty of the spacecraft trajectory, the cometary model, and parameters chosen to characterize the stochastic model for the cometary outgassing drag effects on the spacecraft.

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