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Phoebe's orbit from ground-based and space-based observations | | Josselin Desmars
; Shan-Na Li
; Radwan Tajeddine
; Qing-Yu Peng
; Zheng-Hong Tang
; | | Date: |
1 Mar 2013 | | Abstract: | The ephemeris of Phoebe, the ninth satellite of Saturn, is not very accurate.
Previous dynamical models were usually too simplified, the astrometry is
heterogeneous and, the Saturn’s ephemeris itself is an additionnal source of
error. The aim is to improve Phoebe’s ephemeris by using a large set of
observations, correcting some systematic errors and updating the dynamical
model. The dynamical model makes use of the most recent ephemeris of planets
and Saturnian satellites. The astrometry of Phoebe is improved by using a
compilation of ground-based and space-based observations and by correcting the
bias in stellar catalogues used for the reduction. We present an accurate
ephemeris of Phoebe with residuals of 0.45 arcsec and with an estimated
accuracy of Phoebe’s position of less that 100 km on 1990-2020 period. | | Source: | arXiv, 1303.0212 | | Services: | Forum | Review | PDF | Favorites | |
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