Collinder catalog

In astronomy, the Collinder catalog is a catalog of 471 open clusters by Swedish astronomer Per Collinder. It was published in 1931 as an appendix to Collinder's paper On structural properties of open galactic clusters and their spatial distribution. Catalog objects are denoted by Collinder, e.g. "Collinder 399". Dated prefixes include as Col + catalog number, or Cr + catalog number, e.g. "Cr 399".