Journal Article

CCD astrometric observations of Phoebe in 2005–2008

R. C. Qiao, X. J. Xi, G. Dourneau, K. X. Shen, X. Cheng, Z. H. Tang, S. H. Wang, H. Y. Zhang and Z. X. Qi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 413, issue 2, pages 1079-1082
Published in print May 2011 | ISSN: 0035-8711
Published online April 2011 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2011.18214.x
CCD astrometric observations of Phoebe in 2005–2008

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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.

Keywords: astrometry; planets and satellites: general

Journal Article.  2208 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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