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Spin axis variations of Mars: numerical limitations and model dependences
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Responsible organisation
2008 (English)In: Astronomical Journal, ISSN 0004-6256, Vol. 135, no 4, 1151-1160 p.Article in journal (Refereed) Published
Abstract [en]

Celestial mechanical integrations for the whole solar system are carried out over four billion years before and after the present. The orbital solution of the solar system is stable during this whole time period. An instantaneous spin axis model including triaxiality is developed. In particular, spin axis precession, the Martian obliquity, solar torques, and the orbital eccentricity/inclination of Mars are studied. Model dependences from general relativity, solar oblateness, the Martian moons, solar mass loss, etc. are tested. Although the obliquity of Mars sometimes shows dramatic variations, some structures are robust and seem insensitive to the initial spin precession rate. A full integration is carried out during a total of 8000 Myr resulting in a Martian obliquity that is restricted between 10 and 60 degrees. The problems with numerical noise due to limited machine precision, integration step sizes, and the chaotic sensitivity of the solutions are studied and discussed. The limited machine precision (15-16 figures) alone is found to limit the duration of exact obliquity solutions to about 80 Myr.

Place, publisher, year, edition, pages
2008. Vol. 135, no 4, 1151-1160 p.
Keyword [en]
celestial mechanics, astro physics, spin axis, mars
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:miun:diva-4687DOI: 10.1088/0004-6256/135/4/1151ISI: 000254655300005Scopus ID: 2-s2.0-50849126859Local ID: 5912OAI: oai:DiVA.org:miun-4687DiVA: diva2:29719
Note
VR-PhysicsAvailable from: 2008-11-13 Created: 2008-11-13 Last updated: 2009-11-02Bibliographically approved

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Edvardsson, SverkerKarlsson, KG
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CiteExportLink to record
Permanent link

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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
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  • text
  • asciidoc
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