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\centerline{\bf New Constants for Sampson-Lieske Theory of the}
\centerline{\bf Galilean Satellites of Jupiter II}
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\centerline{J.E.Arlot$^1$, R.Vasundhara$^2$, P.Descamps$^1$}
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\centerline{$^1$ Bureau des Longitudes, URA 0707 CNRS,}
\centerline{77 avenue Denfert-Rochereau, F. 75014 Paris}
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\centerline{$^2$ Indian Institute of Astrophysics}
\centerline{Bangalore 560034, India}
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\centerline{\bf Abstract}
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New constants for Sampson-Lieske theory of the Galilean
Satellites have been derived using 6360 individual photographic
positions (1891-1990) and 438 pseudo astrometric positions from
mutual occultations during 1973, 1979, 1985 and 1991.  Using
these new sets of constants, although no significant improvement
is noticed in the O-C values of the sky plane co-ordinates
compared to G5 and E 2 $\times$ 3, residuals in longitude for Io
and Euyropa are found to improve.   Problems concerning the
inclusion of mutual event data in attempting evaluation of
secular variations of the mean motions of the satellites are
discussed. 
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\noindent Keywords : Galilean Satellites - Mutual occultations -
ephemerides - Jupiter
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