The catalog in its original form contains 374,653 individual observations of about 62,000 different infrared sources. More than 8000 of these sources are identifiable with visible objects. For sources with no published IR source position, a nominal position may have been given based on other sources. Nominal positions are usually the best available, but not necessarily the true IR positions. Nominal position references are indicated in the index.
Nominal positions indicate a general area in the sky.
The name of the object. In general, source names should be given secondary importance when searching catalog listings, with positions given priority. Source names and positions are cross-referenced in the Index of Infrared Source Positions. Source names are sometimes abbreviated. The Right Ascension of the object.