Matson, D. L. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ransford, G. A. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Johnson, T. V. (California Institute of Technology, Jet Propulsion Laboratory, Space Sciences Div., Pasadena Calif., United States)