The aim of the authors Pätzold and Bird, 2001, is to show that the study: Velocity changes of the Giotto spacecraft induced during the flybys of the comets P/Halley and P/Grigg-Skjellerup, by H. Porsche, published in 1999 is not correct. This article replies. © 2001 Éditions scientifiques et médicales Elsevier SAS.
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