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Proper motions

Proper-motion information requires three columns: the separate components, and the epoch of the catalog position. We follow the SAO Catalog in using annual proper-motion units of seconds of time per year in R.A., and seconds of arc per year in Dec. The epoch is given in decimal years. The respective column labels are MUALPHA, MUDELTA, and EPOCH. These are all Real*4 data.

Petra Nass