============================================================================= SMART-1 SPK Files ============================================================================= Last update: 12 MAY 2006 This "aareadme.txt" file describes the contents of the KERNELS/SPK directory of the SMART-1 SPICE data server. It also provides the file naming conventions used for the SMART-1 SPK kernels, and it provides identification of the most current version of each kind of SPK file. Some of these SPK files are produced by an automated system located at ESTEC, operated by the SMART-1 Science and Technology Operation Center (STOC). For these we have chosen to use the ESOC naming convention for SPK files, which are converted from ESOC's DDID Orbit files. Although this convention doesn't seem very descriptive and holds some redundant information, it could be useful to use the same name style for the sake of consistency. Also, data handling performed by the automated system will be easier and faster. The contents and time span covered by any SPK file may be easily determined using the "brief" utility program available in all copies of the SPICE Toolkit. Examples of usage: %brief %brief <*.bsp> %brief Descriptive information about how/why/when an SPK file was created is usually available in the "comment area" of the file. This may be viewed using the "commnt" utility program available in all copies of the SPICE Toolkit. Use the "-r" option to read the comments. Example: %commnt -r All binary SPK files (*.BSP) contained in this directory are unix binary files. These may be used as is (without format conversion) in a non-unix environment when using any recent version of the SPICE Toolkit (Version N0052 or later). [Ref 3b] Contact Jorge Diaz del Rio (jdiaz@rssd.esa.int) or Joe Zender (Joe.Zender@esa.int) if you have any questions. ============================================================================= References ============================================================================= 1. Data Delivery Interface Document (DDID) Appendix H - FD products Issue 3.0 (MEX-ESC-IF-5003) 2. SPK Required Reading. NAIF Document No. 168.10 05 Sep 2002 3. Selected SPICE Tutorials from the NAIF server: ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/ individual_docs/ a) SPK Tutorial 14_spk.ppt b) Porting Kernels Tutorial 09_porting_kernels.ppt ============================================================================= SMART-1 SPK Directory Structure ============================================================================= aareadme.txt Text file describing the directory structure, the naming conventions for the SPKs, and the current version(s) of each SPK type. former_versions Subdirectory that contains obsolete versions of the SPK files that have been updated in the Current SPK Kernels Set. ============================================================================= SMART-1 Spacecraft SPK Naming Convention ffff_______________vvvvv.BSP ============================================================================= token description ------------ ------------------------------------------------ ffff Source Product Type Identifier: ORES -- S/C Orbit, Earth escape, Earth centric. ORMS -- S/C Orbit, Moon phase, Moon centric. vvvv version number ============================================================================= DSN Stations SPK Naming Convention EARTH_[spec]_yymmdd.BSP ============================================================================= token description --------- ------------------------------------------------------- [spec] Reference frame label: FX: EARTH_FIXED alias used. ITRF93: ITRF93 label used. yymmdd Release date. ============================================================================= Planet and Satellite Ephemeris SPK Naming Convention ============================================================================= Use original names assigned by NAIF, in uppercase. For example: DE405.BSP Planetary ephemeris. Moon ephemeris. ============================================================================= Current SPK Kernels Set ============================================================================= Note: Files EARTHSTNS_FX_yymmdd.BSP and EARTHSTNS_ITRF93_yymmdd.BSP contain the same data. These files only differ in that the second one use the reference frame label 'ITR93' instead of 'EARTH_FIXED'. 'EARTH_FIXED' alias must be map to either 'ITR93' or 'IAU_EARTH' before using the file. For high accuracy work, the EARTHSTNS_ITRF93_yymmdd.BSP is recommended (on the basis of ease of use). Name Comments --------------------------------- ----------------------------------------- DE405S.BSP Contains ephemeris data for planet barycenters, and for the sun, earth and moon mass centers. Spans the entire SMART-1 mission. EARTHSTNS_FX_yymmdd.BSP Contains ephemeris data for NASA DSN stations relative to the terrestrial reference frame ITR93. In the interest of flexibility, in this file the reference frame is labeled with the alias 'EARTH_FIXED'. Any application using this file must map the alias 'EARTH_FIXED' to either 'ITR93' or 'IAU_EARTH'. This file was released on yy-mm-dd. EARTHSTNS_ITRF93_yymmdd.BSP Contains ephemeris data for NASA DSN stations relative to the terrestrial reference frame label 'ITR93'. This file was released on yy-mm-dd. ORES_______________xxxxx.BSP Contains SMART-1 spacecraft reconstructed Earth escape phase ephemeredes. These ephemeredes corresponds to the ESOC orbit file named: ORES_FDLSMA_DA______________xxxxx.SM1 where xxxxx designates the version number. ORMS_______________xxxxx.BSP Contains SMART-1 spacecraft predicted and reconstructed ephemeris data for the Extended Lunar Mission Phase (from 01-AUG-2005). These ephemeris correspond to the ESOC orbit file named: ORMM_FDLSMA_DA______________xxxxx.SM1 where xxxxx designates the version number. ORMS__041111020517_00206.BSP Contains SMART-1 spacecraft reconstructed ephemeris data for the Nominal Lunar Mission Phase (from 11-NOV-2004 to 01-AUG-2005). These ephemeredes correspond to the ESOC orbit file named: ORMM_FDLSMA_DA______________00206.SM1