Description of the Asteroid Photometric Catalog bundle V1.0 =========================================================== Bundle Generation Date: 2022-12-20 Peer Review: Neese_Richardson_Mueller_Migration Discipline node: Small Bodies Node Content description for the Asteroid Photometric Catalog bundle =============================================================== NOTE: This bundle was migrated to PDS4 from the PDS3 data set EAR-A-3-DDR-APC-LIGHTCURVE-V1.1. For PDS3 data sets migrated to PDS4, the following text is taken verbatim from the data set description and confidence level note of the PDS3 data set catalog file. In these cases, some details may not be correct as a description of the PDS4 bundle. The Asteroid Photometric Catalog (3rd update), Lagerkvist, et.al., 1993 [LAGERKVISTETAL1993], is a compilation of all asteroid lightcurve photometry published up to and including the year 1992. The dataset includes the lightcurves in a single binary file and a table of references to all original publications. Individual ASCII files of the lightcurves are also included. Parameters ========== The primary data file of this dataset, named 'apc.fit', has an entry for each photometric observation of an asteroid included in any asteroid ightcurve. The parameters given for each observation include Julian date of the observation, the observed magnitude, and the error value associated with the magnitude. Also included for convenience are individual ASCII files for each lightcurve, extracted from the file apc.fit. These are in the subdirectory 'indiv' in the data directory. They are grouped in subdirectories named astnnnnnn, where nnnnnn is the asteroid number. The filenames follow the form YYYYMMDDhhmmss_FILTER.tab, based on the date and time of observation and the filter designation (as listed in apcparam.tab). The index to the primary file and to the individual files, named apcparam.tab', contains an entry for each asteroid lightcurve. Each entry identifies the asteroid, and specifies the filter used, the start and stop time of the lightcurve observation, the heliocentric distance, geocentric distance, phase angle, and geocentric ecliptic longitude and latitude of the asteroid at the time of the observation, the start byte and observation set size of the lightcurve in 'apc.fit', the filename for the individual ascii file, a code for the original published reference reporting the observations, and a code for each comment line. The file 'apcrefs.tab' contains an entry for each published reference from which data is included in the dataset, along with the reference code by which it is cited in 'apcparam.tab'. The file 'apcinfo.tab' contains an entry for each comment line with a code number by which it is referred to in 'apcparam.tab'. Processing ========== No processing has been applied to the photometric data. Additional information for each observation, such as phase angle, have been determined. Data ==== This dataset includes the following data objects. apc.fit - FITS binary table of photometric measurements apcparam.tab - ASCII table of lightcurves which serves as an index to apc.fit and the individual files apcrefs.tab - ASCII table of published references apcinfo.tab - ASCII table of comment lines indiv - subdirectory containing individual ascii lightcurve files. History ======= This data set was first reviewed and archived in 1995. In 2011, it was updated to V1.1 with the following changes: - Individual ASCII lightcurve files, extracted from apc.fit, were added in a subdirectory. - The original index or parameter file in V1.0, apcindex.tab, was modified by adding the filenames of the individual lightcurve files to the entries. Many errors were discovered in the start and stop times in the original file, and these were corrected by replacing them with the actual earliest and latest observation times from the data file. Asteroid numbers were added for those asteroids which had been numbered since the original file was compiled. The revised file is called apcparam.tab. References ========== Lagerkvist, C.-I., M.A. Barucci, M.T. Capria, M. Fulchignoni, L. Guerriero, E. Perozzi, V. Zappala, Asteroid Photometric Catalog, Consiglio Nazionale Della Ricerche, Rome, 1987. Lagerkvist, C.-I., A.W. Harris, and V. Zappala, Asteroid Lightcurve Parameters, in Asteroids II, edited by R.P. Binzel, T. Gehrels, and M.S. Matthews, pp. 1162-1179, Univ. of Arizona Press, Tucson, 1989. Lagerkvist, C.-I., M.A. Barucci, M.T. Capria, M. Dahlgren, A. Erikson, M. Fulchignoni, P. Magnussen, Asteroid Photometric Catalog, Second Update, Uppsala Astronomical Observatory, Uppsala, 1992. Lagerkvist, C.-I., P. Magnusson, I. Belskaya, A. Erikson, M. Dahlgren, M.A. Barucci, Asteroid Photometric Catalog, Third Update, Uppsala Astronomical Observatory, Uppsala, 1993. Caveats to the data user ======================== This is a compilation of published asteroid lightcurve photometry, and the data come from a wide variety of sources. The original reference should be consulted for the confidence level of any given observation.