This data set was assembled by E. F. Tedesco, Jet Propulsion Laboratory, in March 1988 from files provided by the contributors to the above reference. Included are asteroid names and discovery circumstances, proper elements and family identifications, asteroid lightcurve parameters, asteroid pole determinations, taxonomic classes, absolute magnitudes and slope parameters, UBV color indices, and albedos and diameters from the IRAS Asteroid and Comet Survey. The asteroid discovery tables were updated by F. Pilcher in 1994. Introduction: The Asteroids 11 data base presented herein is a compilation of asteroid data published, or in press, as of March 1988 with some updates in early 1989 except, as mentioned, the asteroid discovery tables. It is by no means all-inclusive. Excluded are data sets which have remained essentially unchanged since their publication in Asteroids (Gehrels 1979). These include the spectral reflectance and spectral parameter data sets (Chapman and Gaffey 1979), and the polarimetric and groundbased radiometric data sets (Morrison and Zellner 1979). The primary changes from the book are the omission of the asteroid proper elements by Z. Knezevic and A. Milani. A few columns in other tables were omitted of added. The new discovery data set was assembled by E. F. Tedesco, Jet Propulsion Laboratory, in March 1988. The discovery file has been updated twice and the possibility exists that some of the other files were updated prior to publication or will be updated in the future. For this reason, references to data obtained from these files should reference them explicitly. For example a reference to the rotation data base might read "Lagerkvist, C.-I., Harris, A.W., and Zappala, V. (1987). Asteroids II machine-readable data base: acquired from the ADC (catalog 7108C) in December 1997" in the references section. Naturally, a datum on an individual asteroid, at least one you are discussing in detail, should reference the original source. Although an attempt has been made to provide the information required to provide a minimum understanding of the data, the researcher is urged to refer to the more detailed discussions in the published volume. Data Sets: This machine-readable data base consists of the following files: Data Set(s) Provider(s) -------------------------------------------------------------------------------- Asteroid Names and Discovery Circumstances F. Pilcher Proper Elements and Family Identifications J.G. Williams Asteroid Lightcurve Parameters C.-I. Lagerkvist, A.W. Harris, Asteroid Pole Determinations P. Magnusson Asteroid Taxonomic Classifications D.J. Tholen Asteroid Magnitudes, UBV colors, Albedos, E.F. Tedesco and Diameters --------------------------------------------------------------------------------