Volume 437, Number 3, July III 2005
|Page(s)||1109 - 1113|
|Section||Planets and planetary systems|
|Published online||30 June 2005|
Re-determination of Phoebe's orbit
National Time Service Center, The Chinese Academy of Science, PO Box 18, Lintong, Shaanxi 710600, PR China e-mail: email@example.com
2 United Laboratory for Optical Astrometry, The Chinese Academy of Science, PR China
3 Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SA, UK
4 Observatoire Aquitain des Sciences de l'Univers, UMR 5804 Laboratoire d'Astrodynamique, d'Astrophysique et d'Aéronomie de Bordeaux (L3AB), 2 rue de l'Observatoire, 33270 Floirac, France
Accepted: 10 March 2005
In order to improve the orbit of Phoebe, the ninth satellite of the Saturnian system, 101 new observations were made by our research team in 2003, using a CCD detector of large size ( pixels) mounted on the 1.56 m astrometric reflector at the Sheshan Station of Shanghai Astronomical Observatory. We fitted a numerical integration of its orbit to all of the collected Earth-based astrometric observations from 1904 to 2003, including the newest precise data sets from Qiao & Tang and from Peng et al. A new set of initial conditions of Phoebe has been obtained, leading to an improved orbit of this satellite.
Key words: gravitation / ephemerides / methods: numerical / reference systems / astrometry / time
© ESO, 2005
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