Mars rotational elements: how to explain the long period terms in the IAU standard?

Yseboodt, Marie;Baland, Rose-Marie;Le Maistre, Sébastien
(2022) Europlanet Science Congress 2022 — Location: Granada (18.September.2022)

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Authors
  • Yseboodt, MarieRoyal Observatory of Belgium, Avenue circulaire 3, Brussels, Belgium
    Author
  • Baland, Rose-MarieRoyal Observatory of Belgium, Avenue circulaire 3, Brussels, Belgium
    Author
  • Le Maistre, SébastienUCLouvain
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Abstract
In order to describe the orientation of the spin axis of Mars, the IAU (International Astronomical Union) Working Group on Cartographic Coordinates and Rotational Elements (WGCCRE) uses the right ascension and declination angles, the equatorial coordinates orienting the planet with respect to the Earth equator. This solution is useful to make cartographic products. Differently from IAU, the radioscience community commonly uses Euler angles, with obliquity and node’s longitude defined with respect to the planet mean orbit at epoch. In both sets of angles, a third angle, the rotation angle, is used to position the prime meridian. Its trend is the diurnal rotation.
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Yseboodt, M., Baland, R.-M., & Le Maistre, S. (2022). Mars rotational elements: how to explain the long period terms in the IAU standard? EPSC Abstracts, 16(EPSC2022-1021), 2. https://doi.org/10.5194/epsc2022-1021 (Original work published 2022)