Data Set Overview : This shape model of Phoebe is based on 208 Cassini Imaging Science Subsystem narrow and wide angle camera (ISSNA and ISSWA) images. The shape model was prepared by Robert Gaskell on August 4, 2012.  Coordinate system:  BODY609_POLE_RA : ( 356.90 0. 0. ) BODY609_POLE_DEC : ( +77.88 0. 0. ) BODY609_PM : ( 178.58 +931.639 0. )  (For help in interpreting the values of the SPICE assignments above, see the document 'PCK Required Reading' (PCK.REQ), available at NAIF and in the document directory of this data set.)  The parameters of the model are as follows:  Number of landmarks: 522 RMS position uncertainty: 147 m/dof (degree of freedom) Pointing uncertainty: .045 mrad Pointing residual: .275 mrad Number of observations: 22555 Observations per landmark: 43.2 RMS landmark location residual: 184 m/dof  The models were originally prepared in the Implicitly Connected Quadrilateral (ICQ) format. Vertex-facet format versions, derived from the ICQ versions, are also provided. The filenames are phoebe_quad512q.tab and phoebe_ver512q.tab, where 512 is the value of Q (an indicator of the resolution). See below for the full definition of Q and the ICQ format. For additional information about the shape models, see Gaskell et al. (2008).  The file 'phoebeimagelist.tab' is a list of the Cassini ISSNA and ISSWA images used to generate this model. These images are archived in PDS under the data set ID CO-S-ISSNA/ISSWA-2-EDR-V1.0.  A text file, 'icqmodel.asc' is provided in the 'document' directory which describes the ICQ format and the derivation of the vertex-facet versions.  Modification History :  Version 1.0 of this model was archived in 2011. For V1.0, all images were converted to 8-bit before processing. For V2.0, the processing code had been updated to handle 16-bit, so the 12-bit Cassini images were left as-is for the processing. Version 2.0 was archived in 2013.  References :  Gaskell, R.W., O.S. Barnouin-Jha, D.J. Scheeres, A.S. Konopliv, T. Mukai, S. Abe, J. Saito, M. Ishiguro, T. Kubota, T. Hashimoto, J. Kawaguchi, M. Yoshikawa, K. Shirakawa, T. Kominato, N. Hirata, and H. Demura, Characterizing and navigating small bodies with imaging data, Meteoritics and Planetary Science, vol. 43, Issue 6, p. 1049-1061, 2008.

Confidence Level Overview : Note that the vertex-facet versions of the model have some duplicate vertices on the edges and corners of the cube. The duplicate vertices are not used in the facet table, resulting in the presence of some vertices in the vertex table which do not appear in the facet table. This does not affect the correctness of the vertex-facet version.