Description of the TRIAD RADIOMETRIC DIAMETERS AND ALBEDOS bundle V1.0 ========================================================== Bundle Generation Date: 2020-03-13 Peer Review: 2007 Asteroid Review, 2007-05-24 Discipline node: Small Bodies Node Content description based on the data set catalog file description for the PDS3 version, EAR-A-COMPIL-5-TRIADRAD-V1.0 ===================================================================================================================== Note: 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 radiometric observations used for the Tucson Revised Index of Asteroid Data (TRIAD) compilation consist of broadband radiometry at 10 microns (the N band) and 20 microns (the Q band). Observations from 1972 through 1978 have been used. The results are compiled in Morrison and Zellner (1979). References to the observation papers for each entry are given in the associated references file. The observations have been interpreted with the standard model described in Morrison and Lebofsky (1979), using the computer code of Jones and Morrison (1974). Further details of the analysis are described in Morrison and Lebofsky (1979). This data set includes radiometric diameters and albedos for 195 asteroids. Each asteroid is assigned a quality code as follows: Code 1 is assigned to single observations or to data with large internal uncertainties; these values may not be individually reliable and should be used with caution. Code 2 is assigned in a broad range of situations, including at the minimum two independent measurements on a good photometric night. This code indicates basically secure, believable results. Code 3 is assigned excellent, consistent, multiply-verified data, almost always at both 10 and 20 microns. Usually observations from several nights are required to justify Code 3. While it is not possible to associate a code directly with uncertainties, the three codes correspond roughly to internal uncertainties in the diameters of +/- 20%, 10%, and 5% respectively. The possibility exists of additional errors of up to 10% in the overall diameter calibration, due to the absolute flux calibration. This data set description has been adapted from Morrison and Lebofsky (1979). References: Jones, T.J. and D. Morrison, A recalibration of the radiometric/photometric method of determining asteroid sizes, Astron. J. 79, 892-895, 1974. [JONES&MORRISON1974] Morrison, D., and B. Zellner, Polarimetry and radiometry of the asteroids, in Asteroids, edited by T. Gehrels, pp. 1090-1097, University of Arizona Press, Tucson, 1979. [MORRISON&ZELLNER1979] Morrison, D. and L. Lebofsky, Radiometry of Asteroids, in Asteroids, T. Gehrels, Ed. (University of Arizona Press, Tucson), pp. 184-205, 1979. [MORRISON&LEBOFSKY1979] Known issues or problems with the data ====================================== The confidence level of each entry is indicated in the quality code, described above in the data set description. PDS3 Source =========== Version 1.0 of this bundle was migrated from version 1.0 of the PDS3 data set EAR-A-COMPIL-5-TRIADRAD-V1.0.