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Science 12 January 1996:
Vol. 271. no. 5246, pp. 184 - 188
DOI: 10.1126/science.271.5246.184
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Reports
The Shape of Mars and the Topographic Signature of the
Hemispheric Dichotomy
David E. Smith
and
Maria T. Zuber
Reanalysis of occultation data from the Mariner 9 and Viking
Orbiter spacecraft to determine the shape of Mars indicated that the
hemispheric dichotomy is not a fundamental feature of the shape of the
planet. It is a consequence of an approximately 3-kilometer offset
between Mars's center of mass and center of figure, and the boundary,
along most of its length, consists of broad, gradual surface slopes
over distances of thousands of kilometers. This result was supported by
analysis of high spatial resolution Earth-based radar topographic
profiles. Any successful model for the origin of the dichotomy must
explain a planet with an ellipsoidal shape and a long wavelength
gradual topographic transition between the northern and southern
hemispheres.
D. E. Smith, Laboratory for Terrestrial Physics, NASA/Goddard
Space Flight Center, Greenbelt, MD 20771, USA.
M. T. Zuber, Department of Earth, Atmospheric and Planetary Sciences,
Massachusetts Institute of Technology, Cambridge, MA 02139-4307, USA,
and Laboratory for Terrestrial Physics, NASA/Goddard Space Flight
Center, Greenbelt, MD 20771, USA.
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
- Seasonal Variations of Snow Depth on Mars.
- D. E. Smith, M. T. Zuber, and G. A. Neumann (2001)
Science
294, 2141-2146
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- Internal Structure and Early Thermal Evolution of Mars from Mars Global Surveyor Topography and Gravity.
- M. T. Zuber, S. C. Solomon, R. J. Phillips, D. E. Smith, G. L. Tyler, O. Aharonson, G. Balmino, W. B. Banerdt, J. W. Head, C. L. Johnson, et al. (2000)
Science
287, 1788-1793
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- The Global Topography of Mars and Implications for Surface Evolution.
- D. E. Smith, M. T. Zuber, S. C. Solomon, R. J. Phillips, J. W. Head, J. B. Garvin, W. B. Banerdt, D. O. Muhleman, G. H. Pettengill, G. A. Neumann, et al. (1999)
Science
284, 1495-1503
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- The Structure of the Upper Atmosphere of Mars: In Situ Accelerometer Measurements from Mars Global Surveyor.
- G. M. Keating, S. W. Bougher, R. W. Zurek, R. H. Tolson, G. J. Cancro, S. N. Noll, J. S. Parker, T. J. Schellenberg, R. W. Shane, B. L. Wilkerson, et al. (1998)
Science
279, 1672-1676
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- Topography of the Northern Hemisphere of Mars from the Mars Orbiter Laser Altimeter.
- D. E. Smith, M. T. Zuber, H. V. Frey, J. B. Garvin, J. W. Head, D. O. Muhleman, G. H. Pettengill, R. J. Phillips, S. C. Solomon, H. J. Zwally, et al. (1998)
Science
279, 1686-1692
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