Pathfinder - Accuracy improvement of comet Halley trajectory for Giotto navigation

Details Pathfinder - Accuracy improvement of comet Halley trajectory for Giotto navigation Pathfinder - Accuracy improvement of comet Halley trajectory for Giotto navigation

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.321..318m&link_type=abstract

Nature (ISSN 0028-0836), vol. 321, May 15, 1986, p. 318-320.

Astronomy and Astrophysics

Astronomy

7

Giotto Mission, Halley'S Comet, Space Navigation, Trajectory Analysis, Astronomical Observatories, International Cooperation, Space Observations (From Earth), Spaceborne Astronomy, Vega Launch Vehicle, Very Long Base Interferometry

Scientific paper

The 'Pathfinder' project uses the resources of NASA, ESA and Intercosmos to support the Giotto space probe flyby of comet Halley. The required 500-km approach to comet Halley on the sunward side was so uncertain as to preclude the trajectory's realization with sufficient accuracy on the basis of ground-based astronomical observations alone. Spaceborne observations by the two Vega satellites were accordingly conducted; these, in combination with a very accurate determination of the Vega trajectories using VLBI, allowed a flyby distance of 600 km to be achieved with only + or - 40 km uncertainty.

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