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\title{ The Orbital Stability of the Sun-Jupiter-Saturn System} 
\author{J.R. Donnison and D.F. Mikulskis\\
        (Departement of Mathematical Sciences\\
         Goldmiths College, University of London\\
         New Cross, London SE14 6NW.)}
\date{}

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\maketitle




Kuiper (1973) suggested that the stability of the Sun-Jupiter-Saturn
System may be  meaningfully investigated by studying the stability of
the Sun-Jupiter-Saturnthree-body System. Numerical investigations by
Nacozy (1976) showed that mass enhancement of the two planets beyong a
factor of 29.25 led to instabilities in the system. In this new
investigation similar mass enhancements are studied in detail
numerically and compared with the analytical values derived from the 
$c^{2} H$ method.
 In addition, the eccentricities of the two planets were varied as
well as an enhancement of their masses. It was found that the system
soon showed signs of instability for the increased eccentricities when
the masses of the planets were enhanced by fairly small factors.

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