An Updated SMC and Magellanic Bridge Catalog of Star Clusters,
  Associations and Related Objects
  We present a catalog of star clusters, associations and related extended
objects in the Small Magellanic Cloud and the Magellanic Bridge with 2741
entries, a factor 2 more than a previous version from a decade ago. Literature
data till December 2018 are included. The identification of star clusters was
carried out with digital atlases in various bands currently available in DSS
and MAMA imaging surveys. In particular, we cross-identified recent cluster
samples from the VMC, OGLE-IV and SMASH surveys, confirming new clusters and
pointing out equivalencies. A major contribution of the present catalog
consists in the accurate central positions for clusters and small associations,
including a new sample of 45 clusters or candidates in the SMC and 19 in the
Bridge, as well as a compilation of the most reliable age and metallicity
values from the literature. A general catalog must also deal with the recent
discoveries of 27 faint and ultra-faint star clusters and galaxies projected on
the far surroundings of the Clouds, most of them from the DES survey. The
information on these objects has been complemented with photometric,
spectroscopic and kinematical follow-up data from the literature. The
underluminous galaxies around the Magellanic System, still very few as compared
to the predictions from $\Lambda$ Cold Dark Matter simulations, can bring
constraints to galaxy formation and hierarchical evolution. Furthermore, we
provide diagnostics, when possible, of the nature of the ultra-faint clusters,
searching for borders of the Magellanic System extensions into the Milky Way
gravitational potential.
