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Large-Scale Variations in the Obliquity of Mars

Ward, William R. (1973) Large-Scale Variations in the Obliquity of Mars. Science, 181 (4096). pp. 260-262. ISSN 0036-8075. doi:10.1126/science.181.4096.260.

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Large-scale variations in the obliquity of the planet Mars are produced by a coupling between the motion of its orbit plane due to the gravitational perturbations of the other planets and the precession of its spin axis which results from the solar torque exerted on the equatorial bulge of the planet. The obliquity oscillates on a time scale of approximately 1.2 x 10^5 years. The amplitude of this oscillation itself varies periodically on a time scale of 1.2 X 10^6 years. The present-day obliquity is approximately 25.1 degrees. The maximum possible variation is from about 14.9 to 35.5 degrees. Signtificant climatic effects must be associated with the phenomenon.

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Additional Information:© 1973 American Association for the Advancement of Science. Received 26 March 1973. I acknowledge valuable discussions with Dr. Bruce C. Murray. Supported by NASA grant NGL 05-002-003. Contribution No. 2322 of the Division of Geological and Planetary Sciences, California Institute of Technology.
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NASANGL 05-002-003
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Caltech Division of Geological and Planetary Sciences2322
Issue or Number:4096
Record Number:CaltechAUTHORS:20151109-143707653
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Official Citation:Large-Scale Variations in the Obliquity of Mars Willim R. Ward Science 20 July 1973: 181 (4096), 260-262. [DOI:10.1126/science.181.4096.260]
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62003
Deposited By: Tony Diaz
Deposited On:09 Nov 2015 22:57
Last Modified:10 Nov 2021 22:56

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