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".
Some notable objects from the catalog are:
Collinder 2
Collinder 6
Collinder 7
Collinder 11
Collinder 12
Collinder 14
Collinder 20
Collinder 22
Collinder 23
Collinder 29
Collinder 39
Collinder 42 (Pleiades)
Collinder 50 (Hyades)
Collinder 81
Collinder 140
Collinder 154
Collinder 189 (Beehive)
Collinder 224
Collinder 256
Collinder 285
Collinder 341
Collinder 399 (Brocchi's Cluster or Coathanger)
Collinder 442
There are some errors in Collinder's list or references to it. For example:
Cr 32 is the same as Cr 33
Cr 84 is not NGC 2175 as often mentioned (the NGC object is only the nebula) and its reality "is in some doubt"
the position for Cr 185 "is about 1m too far west and 10' too far north"
Cr 220 is not NGC 3247
Cr 234 is the southern part of Cr 233
Cr 240 is not NGC 3572 but includes it
Cr 249 is sometimes identified as being IC 2944 but is only associated with it, the latter being a nebula
The position for Cr 275 is off
Cr 371 is not NGC 6595
Cr 427 is not NGC 7023
Cr 429 is not NGC 7023 either, it actually does not exist
Cr 470 is not IC 5146
