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Published December 2014 | Published
Journal Article Open

The location of Airy-0, the Mars prime meridian reference, from stereo photogrammetric processing of THEMIS IR imaging and digital elevation data

Abstract

The small crater Airy-0 was selected from Mariner 9 images to be the reference for the Mars prime meridian. Initial analyses in the year 2000 tied Viking Orbiter and Mars Orbiter Camera images of Airy-0 to the evolving Mars Orbiter Laser Altimeter global digital terrain model to update the location of Airy-0. Based upon this tie and radiometric tracking of landers/rovers from Earth, new expressions for the Mars spin axis direction, spin rate, and prime meridian epoch value were produced to define the orientation of the Martian surface in inertial space over time. Since the Mars Global Surveyor mission and Mars Orbiter Laser Altimeter global digital terrain model were completed some time ago, a more exhaustive study has been performed to determine the accuracy of the Airy-0 location and orientation of Mars at the standard epoch. Thermal Emission Imaging System (THEMIS) IR image cubes of the Airy and Gale crater regions were tied to the global terrain grid using precision stereo photogrammetric image processing techniques. The Airy-0 location was determined to be about 0.001° east of its predicted location using the currently defined International Astronomical Union (IAU) prime meridian location. Information on this new location and how it was derived will be provided to the NASA Mars Exploration Program Geodesy and Cartography Working Group for their assessment. This NASA group will make a recommendation to the IAU Working Group on Cartographic Coordinates and Rotational Elements to update the expression for the Mars spin axis direction, spin rate, and prime meridian location.

Additional Information

© 2014 American Geophysical Union. Received 18 JUN 2014; Accepted 3 NOV 2014; Accepted article online 11 NOV 2014; Published online 5 DEC 2014. Appreciation is expressed to the MGS, ODY, and MEX flight operation teams and the MOLA, THEMIS, and HRSC science teams without whose efforts the data used in this article would not have been available. E. Wright and A. Maser of JPL configured the computer used for this analysis to use the NAIF SPICE toolkit and system of data kernels and the X-terminal image display tools. This work was supported by the NASA Science Mission Directorate 2001 Mars Odyssey Participating Scientist, the Mars Express Participating Scientist, and the Mars Data Analysis Programs.

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Published - Duxbury_et_al-2014-Journal_of_Geophysical_Research__Planets.pdf

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Additional details

Created:
August 22, 2023
Modified:
October 20, 2023