Updated Phoebe’s orbit

Authors

  • K. X. Shen,

    Corresponding author
    1. National Time Service Center, Chinese Academy of Sciences, PO Box 18, Lintong, Shaanxi 710600, China
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  • S. N. Li,

    1. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
    2. Shanghai Astronomical Observatory (SHAO), Chinese Academy of Sciences, Shanghai 200030, China
    3. College of Science, Wuhan University of Science and Technology, Wuhan 430065, China
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  • R. C. Qiao,

    1. National Time Service Center, Chinese Academy of Sciences, PO Box 18, Lintong, Shaanxi 710600, China
    2. Key Laboratory of Precision Navigation and Timing Technology, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China
    3. United Laboratory for Optical Astronomy, Chinese Academy of Sciences, 100012 Beijing, China
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  • G. Dourneau,

    1. Observatoire Aquitain des Sciences de l’Univers, Université de Bordeaux, 2 rue de l’Observatoire, BP 89, F-33271 Floirac Cedex, France
    2. CNRS, UMR 5804, Laboratoire d’Astrophysique de Bordeaux, 2 rue de l’Observatoire, BP 89, F-33271 Floirac Cedex, France
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  • H. Y. Zhang,

    1. National Time Service Center, Chinese Academy of Sciences, PO Box 18, Lintong, Shaanxi 710600, China
    2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China
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  • Z. H. Tang,

    1. Shanghai Astronomical Observatory (SHAO), Chinese Academy of Sciences, Shanghai 200030, China
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  • S. H. Wang

    1. Shanghai Astronomical Observatory (SHAO), Chinese Academy of Sciences, Shanghai 200030, China
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E-mail: shenkx@ntsc.ac.cn

ABSTRACT

In recent years, many new CCD observations of Phoebe, the ninth Saturnian satellite, were published. In this paper, we have used all the observations of Phoebe available until 2009 to update Phoebe’s orbit. These observations represent a total number of 2994 positions, spread over a time-interval of 105 years, from 1904 to 2009. The accuracy of the updated orbit of Phoebe presented here has been improved to about 0.1 arcsec as it has been fitted to a large number of new high-accuracy observations. However, the accuracy of the orbit remains limited by the accuracy of the observations. Moreover, we have shown that the new orbit is in quite good agreement with the very reliable JPL ephemeris, within less than 20 mas.

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