We present mean absolute proper motions of 48 southern open clusters,
determined using
the data from the First U. S. Naval Observatory CCD Astrograph Catalog
(UCAC1).
For 9 clusters, this is the first determination of proper motion. The
measurements
made use of large number of stars (usually several tens) for each cluster.
The total number of stars studied in the fields of the 48 open clusters is
16875, of which
2930 were considered members. The mean
proper motions of the clusters and membership probability of individual
stars were obtained
from the proper motion data by applying the statistical method proposed by
Sanders (1971).