meteosat epsg projection code

[Nuno GIL]

dear listers,
we are trying to use some meteosat 2nd generation imagery with
mapserver but we cannot determine successfully its epsg projection
code.
did anyone work with this kind of imagery before? can anyone help us
with the answer?
we've looked around on the Meteosat site - it only refers to the
images being rectified to
look like the satellite is located above 0 deg latitude, 0 deg longitude.

any help is appreciated.
regards,
nuno