USNO-A2.0 Catalogue

C2A is able to read the USNO-A2.0 catalogue which contains 526,280,881 stars. This catalogue is published on 11 CD-ROMs by the US Naval Observatory and it constitutes an astrometric reference for asteroid hunters. Note that C2A can also read the USNO-A1.0 et USNO-SA1.0 catalogues.

You select the USNO-A2.0 catalogue as the current catalogue through the Stars tab of the Options dialogue box, or by SHIFT-right-clicking on the map. You can choose whether to display the blue magnitude or the red magnitude by clicking the Advanced options... button on the  Stars tab of the Options dialogue box.

The information associated with each star in the catalogue is as follows:

  • the red magnitude

  • the blue magnitude

  • the right ascension for the epoch 2000

  • the declination for the epoch 2000

Table of Contents