The magnitude given in this field is taken from the CCDM. It is
generally the original magnitude from the IDS (Index Catalogue of
Visual Double Stars, Jeffers et al. 1963, updated, up to 1976, at
Meudon, Nice and Brussels Observatories from new measurements collected
by C.E. Worley). In most cases it is a 
magnitude, since
many of these magnitudes are visual estimates. For the faintest
systems, it can be a photographic magnitude if the system has been
discovered photographically. However, the type of magnitude is not
specified in the IDS, and is therefore not given here.