HR: 15:45h
AN: P14A-02    [Abstracts]
TI: The Huygens Doppler Wind Experiment: Results from Titan
AU: * Folkner, W M
EM: william.folkner@jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Bird, M K
AF: Radioastronomisches Institut, Universit�t Bonn, Auf dem H�gel 71, Bonn, 53121 Germany
AU: Dutta-Roy, R
AF: Radioastronomisches Institut, Universit�t Bonn, Auf dem H�gel 71, Bonn, 53121 Germany
AU: Allison, M
AF: NASA-Goddard Institute for Space Studies, 2880 Broadway, New York, NY 10025 United States
AU: Asmar, S W
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Atkinson, D H
AF: University of Idaho, Department of Electrical and Computer Engineering PO Box 441023, Moscow, ID 83844 United States
AU: Edenhofer, P
AF: Institut f�r HF-Technik, Universit�t Bochum, Bochum, 44801 Germany
AU: Plettemeier, D
AF: Elektrotechnisches Institut, Technische Universit�t, Dresden, 01062 Germany
AU: Tyler, L H
AF: Stanford University, 350 Serra Mall David Packard #37, Stanford, CA 94305 United States
AU: Preston, R A
AF: Jet Propulsion Laboratory, 4800 Oak Grove Dr., Pasadena, CA 91109 United States
AU: Gurvits, L
AF: Joint Institute for VLBI in Europe, Postbus 2, DwingelooDwingeloo, 7990 AA Netherlands
AB: The ESA Huygens Probe entered and descended for nearly 2.5 hours through the atmosphere of Titan on 14 January 2005. Huygens survived impact on the surface and continued its telemetry broadcast to the NASA Cassini spacecraft on two separate radio links, denoted Channels A and B, respectively, for an additional 1.2 hours. The instrumentation for the Huygens Doppler Wind Experiment (DWE) consisting of two Ultra-Stable Oscillators in the transmitter (TUSO) and receiver (RUSO), were implemented only in Channel A. Whereas Channel B functioned flawlessly during the entire mission, the receiver for Channel A was never able to lock onto the Huygens signal because the DWE-RUSO had not been properly programmed into the critical probe radio relay sequence. All data on Channel A, including the DWE measurements and probe telemetry, were thus lost. In spite of this setback, the Channel A signal was successfully received at many radio telescopes on Earth. The precision of these Doppler measurements, considered as an aggregate, is roughly equivalent to that which had been foreseen from the measurements on board Cassini. We present an overview of the DWE ground-based observations and the Titan wind profile derived from them.
DE: 6280 Saturnian satellites
SC: Planetary Sciences [P]
MN: 2005 Joint Assembly