Note that, as with the Asteroid and Comet Survey , the IMPS databases are fundamentally different from those databases produced for fixed sources.
Asteroids move and their apparent emission levels can vary by large amounts.
Consequently, different methods and criteria were used for processing potential asteroid sightings. These differences are described in the document referred to below. In addition, a number of products too large to include as printed catalogs are available only in machine-readable form, viz., the osculating orbital elements and the IMPS Sightings Database.