A sixth irregular satellite of Uranus has been announced in October 2002,
following its discovery in 2001 and tracking around the planet.
in Sept 2001 using the
Palomar 5-meter telescope,
by P. Nicholson (Cornell University) and C. Dumas (JPL)
in Nov 2001 using the
ESO VLT UT-3 8-meter telescope
by J-M. Petit (Observatoire de Besancon)
in Sept 2002 using the ESO VLT UT-3 8-meter telescope
by observers P.Rousselot and O. Mousis (Observatoire de Besancon)
An image from this final run, when the satellite was only a few arcminutes from the planet, is shown below. The quality of the ESO 8-m telescopes, allowing such a faint target to be seen so close to a bright planet in a single image is an impressive feat.
Using this information, M. Holman and T. Grav were able to recover the satellite in an additional August 2002 image from CTIO.
All available astrometry can be found on Minor Planet Electronic Circular 2002-S64 which contains an orbit computed by B. Marsden (CfA) whose orbits computations allowed the 2002 recovery.
False-colour image of S/2001 U 1
Black and white image of S/2001 U 1 (negative image)