Velocity changes of the Giotto spacecraft during the comet flybys: on the interpretation of perturbed Doppler data |
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| Institution: | 1. Psychology Department, University of Wisconsin-Eau Claire, Eau Claire, WI 54702, USA;2. Wayne State University Law School, 471 West Palmer, Detroit, MI 48202, USA;2. Department of Obstetrics and Gynaecology, IWK Health Centre, Halifax, NS, Canada;3. Department of Anesthesia, Pain Management, and Perioperative Medicine, Dalhousie University, Halifax, NS, Canada;4. Department of Women''s & Obstetric Anesthesia, IWK Health Centre, Halifax, NS, Canada;5. School of Nursing, Dalhousie University, Halifax, NS, Canada;11. Faculty of Medicine, Department of Obstetrics and Gynaecology, Dalhousie University, Halifax, NS, Canada |
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| Abstract: | Upon developing a new theory for the analysis of one-way and two-way Doppler shifts of the radio carrier signal transmitted by interplanetary spacecraft, Porsche (1999) urges a reassessment of the radio science data obtained during the Giotto flybys at comets P/Halley and P/Grigg–Skjellerup. We explain again the Doppler recording method and the operational strategy of the flybys and present both the two-way and one-way data sets from Giotto's flyby at comet Grigg–Skjellerup as an example. We find no reason to change our most probable flyby scenarios. Furthermore, we assert that Porsche's treatment of the classical Doppler effect is in error. All quantities derived from his analysis are gross overestimates and incompliant with observations and cometary physics. |
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