Content description for the Stooke small bodies shape models bundle
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Note: This bundle was migrated to PDS4 from the PDS3 data set EAR-A-5-DDR-STOOKE-SHAPE-MODELS-V2.0.  For PDS3 data sets migrated to PDS4, the following text is taken 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.

This data set contains the Philip Stooke shape models for small solar system bodies based on optical data from the NEAR, Galileo, Giotto, Vega 1,  Vega 2, and Voyager missions.
                                                                              
This version of the data set contains shape models for 243 Ida, 253 Mathilde, 951 Gaspra, comet Halley, J5 Amalthea, J14 Thebe, N7 Larissa, N8 Proteus, S10 Janus, S11 Epimetheus, S16 Prometheus, and S17 Pandora.  The update consists of the addition of shape models for Jupiter's moon Thebe and asteroid 253 Mathilde, and the transformation of the asteroid models to reverse the longitudes in conformance with the recommendations of the IAU Working Group on Cartographic Coordinates.  Some improvements to the model descriptions have also been made.
                                                                              

Parameters                                                                  
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The shape models consist of a grid of body-centered latitude and longitude with a radius listed for each grid point.  Coordinates are planetocentric, increasing to the west for planetary satellites, and to the east for (prograde) asteroids and comets, as recommended by the IAU Working Group on Cartographic Coordinates.  West is defined as being to the left when north is up, regardless of the rotation direction of the body. For satellites, North is defined as the pole on the north side of the invariant plane of the solar system.  For asteroids and comets, North is defined by the right-hand rule.  These are the cartographic coordinate system definitions specified by the IAU's Working Group on Cartographic Coordinates, reported in Archinal et al. (2011).  Radii are given in kilometers.
                                                                              
Note that in the previous release of this data set, PDS3 version V1.0, the earlier IAU convention was followed and the asteroids and comets as well as the satellites had longitudes increasing to the west as specified in Seidelmann et al. (2002).  For V2.0, the asteroids and comets' longitudes were reversed to comply with the later IAU convention specified in Archinal (2011).  The models are otherwise unchanged from PDS3 version V1.0.
                                                                              
References: 
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Archinal, B.A., M.F. A'Hearn, E. Bowell, A. Conrad, G.J. Consolmagno, R. Courtin, T. Fukushima, D. Hestroffer, J.L. Hilton, G.A. Krasinsky, G. Neumann, J. Oberst, P.K. Seidelmann, P. Stooke, D.J. Tholen, P.C. Thomas, and I.P. Williams,
Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009, 
Celestial Mechanics and Dynamical Astronomy 109, 101-135, 2011. 
doi:10.1007/s10569-010-9320-4                            
                                                                              
Seidelmann, P.K., V.K. Abalakin, M. Bursa, M.E. Davies, C. de Bergh, J.H. Lieske, J. Oberst, J.L. Simon, E.M. Standish, P. Stooke, and P.C. Thomas,
Report of the IAU/IAG working group on cartographic coordinates and rotational elements of the planets and satellites: 2000, 
Celestial Mechanics and Dynamical Astronomy, 82, 83-111, 2002.
doi:10.1023/A:1013939327465                      
      
                                                                              
Caveats to the data user
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The origin of the latitude/longitude coordinate system of the models is not coincident with the center of figure, with some models having a substantial offset.  Shifting the origin affects the latitude and longitude of the vertices.
                                                                              
P. Stooke note on comparison of Stooke models with those of Thomas (especially with respect to the Comet Halley model):
'Comparison of independent shape models by P. Stooke and P. Thomas for the same bodies (Amalthea, Janus, Epimetheus) suggests that Thomas tends towards models more convex than the likely shapes, and Stooke tends towards models which are too faceted, or which exaggerate the depths of depressions.'