\documentstyle{article}

\title{New Determination of the Orbit of Iapetus}
\author{Shen Kai Xian\\
Shaanxi Observatory\\
P.O. Box 18, Liutong\\
SHAANXI 710600 China}
\date{}

\begin{document}
\maketitle

Vienne and Duriez (1991,1992) have built TASS (Th\'eorie Analytique des
Satellites de Saturne), which presents a coherent representation of the motion of
all satellites of Saturn with an internal precision of a few kilometers. On the
basis of the theory we give a usable representation of the motion of Iapetus.
From fitting it to the photographic observations, we derive a new determination
of the orbit of Iapetus. The residuals are compared to those obtained by Harper
and Taylor (1993)

\end{document}
