Discovery of mass anomalies on Ganymede

Science

Volumn 305, Issue 5686, 2004, Pages 989-991

  Anderson, John D ^a   Schubert, Gerald ^b,c   Jacobson, Robert A ^a   Lau, Eunice L ^a   Moore, William B ^b   Palguta, Jennifer L ^b  

^a CALIFORNIA INSTITUTE OF TECHNOLOGY   (United States)

^b UNIVERSITY OF CALIFORNIA   (United States)

^c UNIVERSITY OF CALIFORNIA   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

DATA ACQUISITION; DOPPLER EFFECT; SPACECRAFT; SURFACE CHEMISTRY;

DOPPLER DATA; GANYMEDE;

SATELLITES;

ANOMALY; GANYMEDE; MASS;

ARTICLE; ASTRONOMY; GEOLOGY; GRAVITY; MASS; MATHEMATICAL ANALYSIS; PRIORITY JOURNAL; SPACE FLIGHT;

EID: 4043164259     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1099050     Document Type: Article

References (7)

1. A compitation of satellite data can be found in D. J. Tholen, V. G. Tejfel, A. N. Cox, Allen's Astrophysical Quantities, A. N. Cox, Ed. (Springer-Verlag, New York, ed. 4, 2000), pp. 302-310.
2. The interior composition, structure, and dynamics of the four Galilean satellites have been summarized, along with a bibliography, by G. Schubert, J. D. Anderson, T. Spohn, W. B. McKinnon, in Jupiter, F. Bagenal, T. E. Dowling, W. B. McKinnon, Eds. (Cambridge Univ. Press, New York, 2004), chap. 13.
3. W. M. Kaula, Theory of Satellite Geodesy (Blaisdell, Waltham, MA, 1966).
4. J. D. Anderson et al., Galileo Gravity Science Team, Bull. Am. Astron. Soc. 33, 1101 (2001). This reference includes the best determination of Ganymede's radius currently available.
5. -4.
6. P. M. Muller, W. L. Sjogren, Science 161, 680 (1968).
7. We acknowledge the work of Ö. Olsen for finding fits to the fourth-degree gravitational field. We thank W. L. Sjogren, A. S. Konopliv, and D.-N. Yuan for their assistance, especially for providing us with a recompiled version of their gravity-anomaly software Gravity Tools. We also thank D. Sandwell for helpful discussions about the nature of Ganymede's gravity anomalies, and S. Asmar, G. Giampieri, and D. Johnston for helpful discussions. This work was performed at the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. G.S., W.B.M., and J.L.P. acknowledge support by grants from NASA through the Planetary Geology and Geophysics program.