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Volumn 324, Issue 5929, 2009, Pages 921-923

Size and shape of saturn's moon titan

Author keywords

[No Author keywords available]

Indexed keywords

HYDROCARBON;

EID: 66149093118     PISSN: 00368075     EISSN: 10959203     Source Type: Journal    
DOI: 10.1126/science.1168905     Document Type: Article
Times cited : (92)

References (24)
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    • The ephemeris we used was the JPL Cassini orbit solution as of October 2008.
    • The ephemeris we used was the JPL Cassini orbit solution as of October 2008.
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    • The errors on each measurement are well known and range from tens of meters for the altimetry measurements to hundreds of meters for the SAR monopulse data (1, 8, 9, SOM, The correlations in time for the spacecraft pointing and attitude knowledge errors, which dominate all of our observations, are less well known. We conservatively assumed that these errors are perfectly correlated along each pass (a constant attitude error) and uncorrelated between passes.Wecalculatedformalerrorsusingadiagonal approximation to the covariance matrix, subject to the assumption of correlated pointing errors for each acquisition
    • The errors on each measurement are well known and range from tens of meters for the altimetry measurements to hundreds of meters for the SAR monopulse data (1, 8, 9) (SOM). The correlations in time for the spacecraft pointing and attitude knowledge errors, which dominate all of our observations, are less well known. We conservatively assumed that these errors are perfectly correlated along each pass (a constant attitude error) and uncorrelated between passes.Wecalculatedformalerrorsusingadiagonal approximation to the covariance matrix, subject to the assumption of correlated pointing errors for each acquisition.
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    • The planetary radii given in Table 1 and elsewhere in the text are the distances from the specified location to the barycenter of Titan. The radii do not equal the corresponding ellipsoid axes if the best-fit ellipsoid is offset from the barycenter.
    • The planetary radii given in Table 1 and elsewhere in the text are the distances from the specified location to the barycenter of Titan. The radii do not equal the corresponding ellipsoid axes if the best-fit ellipsoid is offset from the barycenter.
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    • We thank the Cassini Radar Team for detailed planning of these observations. This work was supported by the Cassini Project and by NASA as part of the Cassini Data Analysis Program. We also thank the reviewers for many constructive comments on our error analysis and data interpretation. The Cassini Project is a joint endeavor of NASA, the European Space Agency, and the Italian Space Agency. Cassini is managed by JPL, California Institute of Technology, under a contract with NASA
    • We thank the Cassini Radar Team for detailed planning of these observations. This work was supported by the Cassini Project and by NASA as part of the Cassini Data Analysis Program. We also thank the reviewers for many constructive comments on our error analysis and data interpretation. The Cassini Project is a joint endeavor of NASA, the European Space Agency, and the Italian Space Agency. Cassini is managed by JPL, California Institute of Technology, under a contract with NASA.


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