Rosetta Radio Science Investigations (RSI)

Details Rosetta Radio Science Investigations (RSI) Rosetta Radio Science Investigations (RSI)

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....11870p&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #11870

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The Rosetta spacecraft, to be launched sometime in the near future, will be equipped with the Rosetta Radio Science Investigations (RSI) experiment. This experiment addresses fundamental aspects of cometary physics such as the mass and bulk density of the nucleus, its gravity field as well as nongravitational forces, nucleus size and shape, internal structure, composition and roughness of the nucleus surface, the abundance of large dust grains, the plasma content in the coma and the combined dust and gas mass flux. RSI does not have a dedicated instrument on the Rosetta spacecraft. Instead, it uses the onboard radio subsystem responsible for communication between the spacecraftand the ground stations on Earth. The Rosetta radio subsystem is specially equipped with an Ultra-Stable Oscillator (USO) which significantly improves the sensitivity and accuracy of the measurements. The spacecraft is capable of receiving two uplink signals at S-band via the Low Gain Antennas (LGAs), or non-simultaneously receiving at either X-band (7100 MHz) or S-band via the HGA. The downlink transmission via the High Gain Antenna (HGA) can occur simultaneously at S-band and X-band or at S-band only via the LGAs. RSI is interested in the nondispersive frequency shifts (classical Doppler) anddispersive frequency shifts (due to the ionized propagation medium), the signal power and the polarization of the radio carrier waves.Variations in these parameters will yield information on the motion of the spacecraft, theperturbing forces acting on the spacecraft and the propagation medium. The primary and secondary science objectives of RSI at the comet, the asteroid flybys (planned in the original mission scenario) and during cruise are divided into categories begin{itemize}
cometary gravity field investigations,
comet nucleus investigations,
cometary coma investigations
asteroid mass and bulk density as the prime science objectives, and begin{itemize}
solar corona sounding as secondary science objective

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