PDS does not maintain an archive of asteroid orbital elements, as
these are calculated on short time-scales. For access to current
asteroid orbital elements on the web, see these sites:
The Minor Planet Center The Minor Planet Center catalogs asteroid and
comet identifications and orbital elements, and prepares ephemerides and
lists of observable objects. They are the world's central repository
for asteroid and comet astrometric observations.
HORIZONS - JPL Solar System Dynamics ephemeris generator.