Dust Distribution of Comet p/ Halley's Inner Coma Determined from the Giotta Radio Science Experiment

Details Dust Distribution of Comet p/ Halley's Inner Coma Determined from the Giotta Radio Science Experiment Dust Distribution of Comet p/ Halley's Inner Coma Determined from the Giotta Radio Science Experiment

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...187..712e&link_type=abstract

Astronomy and Astrophysics, Vol.187, NO. 1+2/NOV, P. 712, 1987

Astronomy and Astrophysics

Astrophysics

20

Scientific paper

Measurements of the Giotto Radio-Science Experiment, consisting of the Doppler frequency shift and the intensity level of the X-band downlink signal of the Giotto spacecraft during Halley encounter, are analysed and interpreted. Continuous radio-science data were recorded throughout the encounter. The Doppler shift observed over a time interval of about 100s is attributed to a drag effect in the cometary atmosphere causing a deceleration of the spacecraft. The total change of velocity of Giotto was 23.05 ± 0.05 cm s-1 , yielding a best estimate for the total cometary mass impacting the spacecraft of 0.32 g. The cometary mass fluence and mean mass density along the Giotto trajectory was found to be l.2 10-4 kgm-2 and 1.8 10-11 kgm-3, respectively. Within a time interval ± 45 s about closest approach, at least four well-established, sharply confined dust jets are distinguished, for which the characteristic geometries and production rates can be inferred. The total dust production rate is estimated to be 1.5 103 kg s-1 The comet's jet structure derived from these Doppler data is shown to correlate with measurements on board Giotto.

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