HighlightsWe discuss the effect of atmospheric friction on spacecraft flybys.An atmospheric model for the thermosphere is used for calculations.We determine the perturbations for the osculating hyperbolic orbit at perigee.We conclude that atmospheric friction alone cannot explain the flyby anomaly.

    AbstractGravity assist manoeuvres are one of the most successful techniques in astrodynamics. In these trajectories the spacecraft comes very close to the surface of the Earth, or other Solar system planets or moons, and, as a consequence, it experiences the effect of atmospheric friction by the outer layers of the Earth’s atmosphere or ionosphere. In this paper we analyze a standard atmospheric model to estimate the density profile during the two Galileo flybys, the NEAR and the Juno flyby. We show that, even allowing for a margin of uncertainty in the spacecraft cross-section and the drag coefficient, the observed - 8 mm/s anomalous velocity decrease during the second Galileo flyby of December 8th 1992 cannot be attributed only to atmospheric friction. On the other hand, for perigees on the border between the thermosphere and the exosphere the friction only accounts for a fraction of a millimeter per second in the final asymptotic velocity.


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    Titel :

    Kinematics effects of atmospheric friction in spacecraft flybys


    Beteiligte:
    Acedo, L. (Autor:in)

    Erschienen in:

    Advances in Space Research ; 59 , 7 ; 1715-1723


    Erscheinungsdatum :

    2017-01-04


    Format / Umfang :

    9 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






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