CCD astrometric observations of Phoebe in 2005–2008

Authors

  • R. C. Qiao,

    Corresponding author
    1. National Time Service Center (NTSC), Chinese Academy of Sciences, PO Box 18, Lintong, Shaanxi 710600, China
    2. United Laboratory for Optical Astronomy, Chinese Academy of Science, China
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  • X. J. Xi,

    1. National Time Service Center (NTSC), 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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  • G. Dourneau,

    1. Université de Bordeaux, Observatoire Aquitain des Sciences de l'Univers (OASU), Laboratoire d'Astrophysique de Bordeaux (LAB), CNRS-UMR 5804, 2 rue de l'Observatoire, 33270 Floirac, France
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  • K. X. Shen,

    1. National Time Service Center (NTSC), Chinese Academy of Sciences, PO Box 18, Lintong, Shaanxi 710600, China
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  • X. Cheng,

    1. National Time Service Center (NTSC), 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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  • H. Y. Zhang,

    1. National Time Service Center (NTSC), 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. X. Qi

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

ABSTRACT

Astrometric observations of Phoebe, the faint ninth satellite of Saturn, with a visual magnitude of 16.5, were performed during four successive oppositions in 2005, 2006, 2007 and 2008. A total of 1173 new observed positions of Phoebe, representing more than 50 per cent of the observational data now available, were obtained during 30 nights of observation involving six missions and three telescopes. A comparison of our observed positions with the JPL Phoebe ephemeris shows the high quality of our observations, which have an accuracy of about 100 mas. Moreover, our observations appear to be consistent with this ephemeris within only about 50 mas.

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