| DATA_SET_DESCRIPTION |
Data Set Overview
=================
IAU-adopted magnitude parameters (absolute V magnitude and slope
parameter) for all numbered asteroids.
The absolute magnitude is variously given to 0.01, 0.1, or 1.0 mag
precision, depending on the accuracy and consistency of the data
used to arrive at the value.
Those slope parameters that were determined by fitting the adopted
phase function of Bowell, et al. (1989) [BOWELLETAL1989] to data
are given an origin code letter of 'f' (for 'fitted'); all others
are given a code letter of 'a' (for 'assumed'). The default value
is 0.15 in all cases. Note that because most absolute magnitudes
are based on apparent magnitudes measured at non-zero phase
angles, the value of the absolute magnitude does depend on the
assumed value for the slope parameter. A change in the assumed
value of the slope parameter (based on a taxonomic classification,
for example) should not be made independently of the absolute
magnitude.
This version of the file contains magnitude parameters for all
asteroids numbered as of the 2002 March 28 batch of Minor
Planet Circulars and includes 39462 entries. The absolute
magnitude database underwent a major revision recently, with
updated values being published on Minor Planet Circulars 28104
through 28116. Known errors were corrected at that time, and
magnitude parameters that had been taken from the literature for
previous versions of the PDS database became formally adopted.
Although the updated list as published in the Minor Planet
Circulars includes values for all asteroids numbered as of that
time, many were not changed from the previously published list.
For purposes of this database, unchanged magnitude parameters
retain their original reference, which should make it easier for
the user to determine which have been updated.
Bowell, E., B. Hapke, D. Domingue, K. Lumme, J. Peltoniemi, and A.
W. Harris 1989. Application of photometric models to asteroids.
In Asteroids II (R. P. Binzel, T. Gehrels, and M. S. Matthews,
Eds.), pp. 524-556. Univ. of Arizona Press, Tucson.
[BOWELLETAL1989]
Spencer, J.R., L.A.Akimov, C.Angeli, P.Angelini, M.A. Barucci,
P.Birch, C.Blanco, M.W.Buie, A.Caruso, V.G. Chiornij, F.Colas,
P.Dentchev, N.I.Dorokhov, M.C.De Sanctis, E.Dotto, O.B.Ezhkova,
M.Fulchignoni, S.Green, A.W.Harris, E.S.Howell, T.Hudecek,
A.V.Kalashnikov, V.V.Kobelev, Z.B.Korobova, N.I.Koshkin,
V.P.Kozhevnikov, Y.N.Krugly, D. Lazzaro, J.Lecacheux,
J.MacConnell, S.Yu.Mel'nikov, T. Michalowski, B.E.A.Mueller,
T.Nakamura, C.Neese, M.C.Nolan, K.S.Noll, W.Osborn, P.Pravec,
D.Riccioli, V.S.Shevchenko, V.G.Shevchenko, D.J.Tholen,
F.P.Velichko, C.Venditti, R. Venditti, W.Wisniewski, J.Young, and
B.Zellner 1995. The lightcurve of 4179 Toutatis: Evidence for
complex rotation. Icarus 117, 71-89. (K.S.Noll was added as a
coauthor in an erratum published in a subsequent issue of Icarus.)
[SPENCERETAL1995]
Modification History
====================
The astermag data set was first introduced into PDS at the April
1993 asteroid data sets review. It has subsequently been updated
at the March 1995, March 1996, April 1999, June 2000, and May 2002
asteroid data sets reviews. The updates consist of adding
additional data which have become available since the previous
update.
Parameters
==========
The data file contains one entry for each numbered asteroid, and
each entry includes fields for the following parameters. Asteroid
catalog number, absolute V magnitude, slope parameter, a code for
the origin of the slope parameter, the reference for the data, and
a note flag.
Data
====
The data are presented in a single ASCII data table,
'astermag.tab'.
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