PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM LABEL_REVISION_NOTE = " 28 Mar 2001 A.C.Raugh: Template created for Eros Shape Model 29.Mar 2001 B.T.Carcich: filled in some the details 30.Mar 2001 B.T.Carcich: Converted to multiple plate models covered by this DATA_SET object 30.Mar 2001 B.T.Carcich: All six plate models included 2009-07-13 T.Barnes(SBN): Added CITATION_DESC from EN copy and added ABSTRACT_DESC. 2009-09-09 T.Barnes(SBN): Added DETAILED_CATALOG_FLAG. 2009-09-12 T.Barnes(SBN): Added DATA_SET_MISSION and RECORD_TYPE" OBJECT = DATA_SET DATA_SET_ID = "NEAR-A-MSI-5-EROS-SHAPE-MODELS-V1.0" OBJECT = DATA_SET_INFORMATION DATA_SET_NAME = "NEAR MSI SHAPE MODEL FOR 433 EROS V1.0" DATA_SET_COLLECTION_MEMBER_FLG = "N" DATA_OBJECT_TYPE = TABLE START_TIME = "N/A" STOP_TIME = "N/A" DATA_SET_RELEASE_DATE = 2001-09-30 PRODUCER_FULL_NAME = "BRIAN CARCICH" DETAILED_CATALOG_FLAG = "N" ABSTRACT_DESC = " This data set contains the Peter Thomas shape model for asteroid 433 Eros, based on optical data from the NEAR MSI instrument. " CITATION_DESC = " Thomas P.C., J. Joseph, B.T. Carcich, A.C. Raugh, NEAR MSI SHAPE MODEL FOR 433 EROS V1.0, NEAR-A-MSI-5-EROS-SHAPE-MODELS-V1.0, NASA Planetary Data System, 2001." DATA_SET_TERSE_DESC = " This data set consists of a shape model, in varying resolutions and formats, of the surface of 433 Eros, derived from observations made by the NEAR Multi-Spectral Imager (MSI) instrument." DATA_SET_DESC = " Data Set Overview ================= This data set contains the Peter Thomas shape model for asteroid 433 Eros, based on optical data from the NEAR MSI instrument. The current version of this data set contains the following shape model files and PRODUCT_ID's eros_2001012_001708.tab PLATE-EROS-2001012-001708 eros_2001012_007790.tab PLATE-EROS-2001012-007790 eros_2001012_010152.tab PLATE-EROS-2001012-010152 eros_2001012_022540.tab PLATE-EROS-2001012-022540 eros_2001012_088398.tab PLATE-EROS-2001012-088398 eros_2001012_200700.tab PLATE-EROS-2001012-200700 erosrgst_2001012.tab RGST-EROS-2001012 Each shape model file also has a detached label file, with a suffix of .lbl, which describes the respective formats. The first six files are in a plate model format and only represent the model shape. The last file is in a modified Peter Thomas RGST model format and includes shape, gravity, slope and topograpic information. N.B.: In the RGST-EROS-2001012 product, some radii starting from the model center intersect the surface in more than one point. This happens mostly around 160 degrees west longitude. That means that the RGST format used in that product is not able to adequately represent the shape model's surface. Caveat emptor. If this is an issue, users may use one of the plate models. The plate file naming convention uses three fields, separated by underscores: the first field is the target, eros; the second field represents the version of the base shape model, 2001012; the third field gives the number of plates in that file's representation of the base shape model. All files represent the same Eros shape model (2001012) only the resolution and format changes between files. These shape models are distinct from the Peter Thomas shape models based on optical data from other sources, included in a separate data set: EAR-A-5-DDR-SHAPE-MODELS-V2.0. These shape models are also distinct from the shape models based on radar observations, included in a separate data set: EAR-A-5-DDR-RADARSHAPE-MODELS-V1.0. Parameters ========== A single data table contains both the cartesian coordinates of the vertices and the list of vertices defining triangular facets. Details of mapping and production of the model are given in the Processing section below, and further details are given in the relevant published paper. [THOMASETAL2001]. Processing ========== Shape model derived via stereogrammetry of 1,888 NEAR MSI images. The model is based on 31,532 observations of 6,328 control points. The actual plate models have triangular plates, with vertices interpolated from the control points. To transform the set of individual coordinates of control points into these plate model files, we make use of software internally called 'WaG,' currently being developed by Applied Research Associates NZ Limited. Coordinate System ================= The 433 Eros body-fixed planetocentric coordinate system is defined as follows: North Spin Pole with respect to the J2000 reference frame: RA = 11.350 Dec = 17.216, +/- 0.02 degrees Prime Meridian: W = 326.027 + 1639.38864745 d, degrees (d in days after the J2000 epoch, JD 2451545.0) The body-fixed ``Planetocentric'' coordinate system referred to here is defined for solar system bodies as follows: -- The x-axis of the Planetocentric coordinate system for a specified body lies both in the body's equatorial plane and in the plane containing the body's prime meridian. -- The z-axis is parallel to the body's mean axis of rotation and points North of the invariable plane of the solar system (regardless of the body's spin direction). The north pole is this pole of rotation. -- The y-axis is defined as the cross product of the z and x axes, in that order. Thus, the frame is right-handed. The above definition implies that the axes of a planetocentric system are time-varying. Thus a complete specification of the axes requires identification of an epoch as well as the body. This frame is relative to J2000. Software ======== The plate model format is compatible with software developed at Cornell. The two packages are POINTS, written by Jonathan Joseph, which is used to collect and solve for the control points that are the basis for the shape model, and ORBIT, written by Brian Carcich, which used the model to aid science planners when they created the sequences of images during the NEAR mission. None of these software packages will be archived with these shape models. Media/Format ============ These data are included as part of the NEAR mission archive, and are also available for Internet download. " CONFIDENCE_LEVEL_NOTE = " Confidence Level Overview ========================= The center of figure is within 50 m of the center of mass provided by the NEAR Navigation team at JPL. The control point RMS error is less than 10 m. The error at any point on the surface is typically less than 50 m. Review ====== External review of the NEAR mission archive, including this data set, was peformed in August, 2001. " END_OBJECT = DATA_SET_INFORMATION OBJECT = DATA_SET_HOST INSTRUMENT_HOST_ID = NEAR INSTRUMENT_ID = MSI END_OBJECT = DATA_SET_HOST OBJECT = DATA_SET_TARGET TARGET_NAME = EROS END_OBJECT = DATA_SET_TARGET OBJECT = DATA_SET_MISSION MISSION_NAME = "NEAR EARTH ASTEROID RENDEZVOUS" END_OBJECT = DATA_SET_MISSION OBJECT = DATA_SET_REFERENCE_INFORMATION REFERENCE_KEY_ID = "THOMASETAL2001" END_OBJECT = DATA_SET_REFERENCE_INFORMATION END_OBJECT = DATA_SET END