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Astron. Astrophys. Suppl. Ser. 130, 77-80

Astrometry of satellites I to V of Uranus 1990-1991[*]

D.H.P. Jones 1,2 - D.B. Taylor 1 - I.P. Williams 2

Send offprint request: D.H.P. Jones,

1 - Royal Greenwich Observatory, Madingley Rd., Cambridge, CB3 0EZ, UK
2 - Astronomy Unit, School of Mathematical Sciences, Queen Mary and Westfield College, Mile End Road, London E1 4NS, UK

Received September 25; accepted November 7, 1997


139 CCD images of the Uranian satellite system taken with the Jacobus Kapteyn Telescope in 1990 and 1991 have been calibrated astrometrically with two WFC photographic plates taken on the same telescope in 1996. The numbers of images are: I Ariel 139; II Umbriel 132; III Titania 137; IV Oberon 128; V Miranda 117; total 653. The root-mean-square (rms) fits of the inter-satellite positions to the numerical integration by Taylor (1998) lie between $0\hbox{$.\!\!^{\prime\prime}$}025$ and $0\hbox{$.\!\!^{\prime\prime}$}
 061$, depending on which two satellites are compared.

Key words: planets and satellites: satellites of Uranus -- observations astrometry

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