Two-Micron Sky Survey

Not to be confused with 2MASS.

Two-Micron Sky Survey, or IRc, or Infrared compact, or Caltech infrared catalog is the astronomical catalogue of the infrared sources published in the 1969 by Neugebauer and Leighton.

Catalogue index consists of two numbers - declination rounded to multiplier of 10 degrees, with sign, and star ordinal number within declination band. Catalog contains about 5000 objects, most of them are M-type stars.

The IRc catalog data format is plain text, after uncompressing by unzip or gunzip it can be seen by any text viewers or by online ADC viewer.

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