DM 122 A8 DM number. For southern stars, components may appear in different catalogs. See note 9. All magnitudes are given to two decimal places in the computer version. Magnitudes given to one decimal place in the printed version are based on the DM magnitudes and estimates of the meridian and double star observers.
Spectral types are almost wholly from the HD catalogue.
The plans for GC included from the beginning a revision of the Boss system of star positions and motions. The revision could not begin until the St. Luis and Albany results were available, and it was of course desirable to include the latest fundamental work possible without delaying GC itself. The revision and the preparation of the catalogue were therefore carried on concurrently, the star reductions being first made on the old Preliminary GC system and then reduced to GC system by the application of the corrections found in the revision. It also involves the un- certainties of the methods by which the corrections were obtained. An early mean epoch indicates that the star lacks modern observations, while a late epoch denotes the lack of early observations.