U.K. Schmidt-Caltech Asteroid Survey, or U.K. Schmidt Telescope-Caltech asteroid survey, or UCAS is the joint astronomical survey performed in 1982. This survey are no longer exist as separate entity, but rather integrated into astorb asteroids database. The UCAS 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. Specifications for catalog format are provided on the download sites.