  $\rm CePt_3Si$ is a novel heavy fermion superconductor, crystallising in the
$\rm CePt_3B$ structure as a tetragonally distorted low symmetry variant of the
$\rm AuCu_3$ structure type. $\rm CePt_3Si$ exhibits antiferromagnetic order at
$T_N \approx 2.2$ K and enters into a heavy fermion superconducting state at
$T_c \approx 0.75$ K. Large values of $H_{c2}' \approx -8.5$ T/K and $H_{c2}(0)
\approx 5$ T refer to heavy quasiparticles forming Cooper pairs. Hitherto, $\rm
CePt_3Si$ is the first heavy fermion superconductor without a center of
symmetry.
