First results from the Giotto radio-science experiment

Details First results from the Giotto radio-science experiment First results from the Giotto radio-science experiment

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..355e&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 355-357. BMFT-ESA-NASA-supported research.

Physics

20

Giotto Mission, Halley'S Comet, Radio Probing, Rangefinding, Cometary Atmospheres, Doppler Radar, Ionospheric Electron Density, Planetary Mass, Radial Velocity, Satellite Drag

Scientific paper

A definite deceleration of the comet probe Giotto due to drag in the comet Halley atmosphere has been noted by means of Doppler and ranging measurements based on the radio signals of the Giotto spacecraft. The total radial velocity change is 16.7 cm/s over a 100-s interval; this corresponds to a Doppler frequency of 4.7 Hz. This velocity change is used to estimate a total cometary mass striking the spacecraft of between 0.1 and 1.0 g.

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