Data Set Information
DATA_SET_NAME ASTEROID ABSOLUTE MAGNITUDES V2.0
DATA_SET_ID EAR-A-5-DDR-ASTERMAG-V2.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview:IAU-adopted magnitude parameters (absolute V magnitude and slopeparameter) for all numbered asteroids. The absolute magnitude is variously given to 0.01, 0.1, or 1.0 magprecision, depending on the accuracy and consistency of the data usedto arrive at the value. Those slope parameters that were determined by fitting theIAU-adopted phase function (see Bowell et al. 1989) to data are givenan origin code letter of 'f' (for 'fitted'); all others are given acode letter of 'a' (for 'assumed'). The default value is 0.15 in allcases. Note that because most absolute magnitudes are based onapparent magnitudes measured at non-zero phase angles, the value ofthe absolute magnitude does depend on the assumed value for the slopeparameter. A change in the assumed value of the slope parameter(based on a taxonomic classification, for example) should not be madeindependently of the absolute magnitude. 'MPC' in the reference field stands for 'Minor Planet Circular',published on behalf of Commission 20 of the InternationalAstronomical Union by the Minor Planet Center, SmithsonianAstrophysical Observatory, Cambridge, MA 02138. This version of the dataset contains magnitude parameters for allasteroids numbered as of the 1996 February 4 batch of Minor PlanetCirculars and includes 6842 entries. Although errors are known toexist, more accurate values have yet to be adopted by the IAU. Intwo cases, described in the notes, the IAU-adopted values werereplaced by better ones. Improved values will be incorporated intothis database after they become formally adopted. The AsteroidSubnode of the Planetary Data System would be happy to acceptpublished values of improved magnitude parameters for forwarding tothe appropriate IAU committee. Comments on individual entries in the dataset: (1) The absolute magnitude of 16 for (878) Mildred was adopted by the IAU prior to the recovery of this formerly lost asteroid (see MPC 17260). Following recovery, the inclusion of new and recent astrometric observations led to a significant revision of the absolute magnitude for this object (see MPC 18400). ASTERMAG.DAT reflects this more recent value, rather than the older IAU-adopted value. (2) The IAU-adopted absolute magnitude of 14.0 for (4179) Toutatis (see MPC 17271) was known to be seriously in error prior to this Apollo asteroid's 1992 December 08 close approach to the Earth. The values included here are from Spencer et al. (1994). References: 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. Spencer, J. R., L. A. Akimov, C. Angeli, P. Angelini, M. A. Barucci, P. Birch, C. Blanco, M. Buie, A. Caruso, V. G. Chiornij, F. Colas, P. Dentchev, M. C. De Sanctis, E. Dotto, M. Fulchignoni, S. Green, A. Harris, T. Hudecek, A. V. Kalashnikov, V. V. Kobelev, V. P. Kozhevnikov, Y. Krugly, D. Lazzaro, J. Lecacheux, J. MacConnell, T. Michalowski, R. A. Mohamed, B. Mueller, T. Nakamura, C. Neese, W. Osborn, P. Pravec, D. Riccioli, V. Shevchenko, D. Tholen, F. 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. Modification History:The astermag data set was first introduced into PDS at the April 1993asteroid datasets review. It has subsequently been updated at theMarch 1995 and March 1996 asteroid datasets reviews. The updatesconsist of adding additional data which have become available sincethe previous update. DATA_SET_UPDATE_PERIOD : 1.0 Parameters:The data file contains one entry for each numbered asteroid, and eachentry includes fields for the following parameters. Asteroid catalognumber, absolute V magnitude, slope parameter, a code for the originof 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'. Media/Format:This dataset is released in the form of ASCII files which may bestored on disk or other magnetic medium and which may be distributedby ftp, email, real-time access by remote login, or by whatever meansis most convenient.
DATA_SET_RELEASE_DATE 1996-03-29T00:00:00.000Z
START_TIME 1990-12-02T12:00:00.000Z
STOP_TIME 2008-04-20T12:00:00.000Z
MISSION_NAME SUPPORT ARCHIVES
MISSION_START_DATE 2004-03-22T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME ASTEROID
TARGET_TYPE ASTEROID
INSTRUMENT_HOST_ID PUBLIT
INSTRUMENT_NAME COMPILATION
INSTRUMENT_ID COMPIL
INSTRUMENT_TYPE UNKNOWN
NODE_NAME Small Bodies
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE Review:This data set underwent formal external review on March 29, 1996. Data Coverage and Quality:This version of the dataset contains magnitude parameters for allasteroids numbered as of the 1996 February 4 batch of Minor PlanetCirculars and includes 6842 entries. Although errors are known toexist, more accurate values have yet to be adopted by the IAU. Intwo cases, described in the notes, the IAU-adopted values werereplaced by better ones. Improved values will be incorporated intothis database after they become formally adopted. The AsteroidSubnode of the Planetary Data System would be happy to acceptpublished values of improved magnitude parameters for forwarding tothe appropriate IAU committee.
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT IAU-adopted magnitude parameters (absolute V magnitude and slope parameter) for all numbered asteroids.
PRODUCER_FULL_NAME DAVID J. THOLEN
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