Grün, Determine size, Max-Planck-Institut speed, and charge (Germany) of small particles such as micrometeorites near Jupiter and its satellites. Celestial mechanics J. D. Anderson, JPL Use the tracking data (Team Leader) to measure the gravity fields of Jupiter and its satellites; search for gravity waves propagating through interstellar space. Radio propagation H. T. Howard, Use radio signals Stanford U. (Team from the Orbiter Leader) and Probe to study the structure of the atmospheres and ionospheres of Jupiter and its satellites. Interdisciplinary F. P. Fanale (JPL), P. J. Gierasch (Cornell Scientists: U.), D. M. Hunten (U. Arizona), H. Masursky (U.S. Geological Survey), M. B. McElroy (Harvard U.), D. Morrison (U. Hawaii), G. S. Orton (JPL), T. Owen (SU New York), J. B. Pollack (NASA Ames), C. T. Russell (UC Los Angeles), C. Sagan (Cornell U.), F. L. Scarf (TRW), G. Schubert (UC Los Angeles), C. P. Sonett (U. Arizona), J. A. Van Allen (U. Iowa). The Probe will spend nearly an hour descending from a pressure level of about 0.1 bar, where the heat shield is jettisoned, to a depth of 10-20 bars. During this time it will make most of its scientific measurements, relaying them back to Earth via the Probe carrier. Designers expect the Probe to sink through regions of ammonia clouds, ammonium hydrosulfide clouds, and ice and water clouds during this hour.