Data Set Overview
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
The primary data file of this dataset, named 'apc.fit', has an entry for
each photometric observation of an asteroid included in any asteroid
lightcurve. 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
No processing has been applied to the photometric data. Additional
information for each observation, such as phase angle, have been determined.
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
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
- 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.
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.