============================================================================= ROSETTA PCK Files ============================================================================= Last Update: 15 MAY 2006 This "aareadme.txt" file describes the contents of the KERNELS/PCK directory of the ROSETTA SPICE data server. It also provides the file naming conventions used for the ROSETTA PCK kernels, and it provides identification of the most current version of each kind of PCK file. PCK files in this directory are either binary or text files. Text files are created manually with the information from mainly the 2000 IAU Report, with the exception of the Rosetta Asteroid Targets (Lutetia and Steins), which information was obtained from "The Rosetta Asteroid Targets" paper [Ref 4]. Binary files are created from the information contained in the EOP files provided by IERS. All binary PCK files (*.BPC) contained in this directory are unix binary files. These may be used as is (without format conversion) in a non-unix environment by using any recent version of the SPICE Toolkit (Version N0052 or later). [Ref 2a] All text PCK files (*.TPC) contained in this directory are unix text files. These may be used in a non-compatible text environment by using the ASCII mode of FTP to port the files. [Ref 2a] Contact Jorge Diaz del Rio (jdiaz@rssd.esa.int) ot Joe Zender (Joe.Zender@esa.int) if you have any questions. ============================================================================= References ============================================================================= 1. PCK Required Reading. NAIF Document No. 254.05 2. Selected SPICE Tutorials from the NAIF server: ftp://naif.jpl.nasa.gov/pub/naif/toolkit_docs/Tutorials/office/individual_docs/ a) Porting Kernels Tutorial 09_porting_kernels.ppt b) PCK Tutorial 16_pck.ppt 3. NAIF IDs Required Reading. NAIF Document No. 219.12 4. "The Rosetta Asteroid Targets", M. A. Barucci, Padova. 31 Jan 2006 ============================================================================= Rosetta PCK Directory Structure ============================================================================= aareadme.txt Text file describing the directory structure, the naming conventions for the PCK, and the current version(s) of each PCK type. former_versions Subdirectory that contains obsolete versions of the PCK files that have been updated in the Current PCK Kernel Set. ============================================================================= Rosetta Binary PCK Naming Convention EARTH_[sdat]_[edat]_[pdat].BPC ============================================================================= token description --------- ------------------------------------------------------- [sdat] Coverage start time of the file in YYMMDD format. [edat] Coverage end time of the file in YYMMDD format. [pdat] Start time for the predicted data in the file in YYMMDD format. ============================================================================= Current PCK Kernels Set ============================================================================= Name Comments ------------------------------ -------------------------------------------- EARTH_[sdat]_[edat]_[pdat].BPC PCK file containing the orientation of the Earth as a function of time for the interval [sdat] to [edat]. From [pdat] the information contained in the file corresponds to predicted data. The rotational effects included are precession, nutation, rotation through true siderial time, polar motion and nutation corrections. DE403-MASSES.TPC PCK file containing the masses for the sun, planets, satellites and planetary barycenters These masses are given as ratios to of Solar GM to barycenter GM. PCK00008.TPC PCK file containing the size, shape, radii and orientation constants for planets, satellites, Sun and some asteroids. ROS_LUTETIA_LC1_V02.TPC Preliminary PCK file containing draft values for the pole orientation, rotation period and shape obtained from [Ref 4] for the Asteroid 21 Lutetia, acording to the lightcurves Pole Solution #1 presented in [Ref 4]. ROS_LUTETIA_LC2_V02.TPC Preliminary PCK file containing draft values for the pole orientation, rotation period and shape obtained from [Ref 4] for the Asteroid 21 Lutetia, acording to the lightcurves Pole Solution #2 presented in [Ref 4]. ROS_LUTETIA_R1_V02.TPC Preliminary PCK file containing draft values for the pole orientation, rotation period and shape obtained from [Ref 4] for the Asteroid 21 Lutetia, acording to the Radar Pole Solution #1 presented in [Ref 4]. ROS_LUTETIA_R2_V02.TPC Preliminary PCK file containing draft values for the pole orientation, rotation period and shape obtained from [Ref 4] for the Asteroid 21 Lutetia, acording to the Radar Pole Solution #2 presented in [Ref 4]. ROS_STEINS_V02.TPC Preliminary PCK file containing draft values for the rotation period and shape obtained from ESA Science/Rosetta pages for the Asteroid 2867 Steins and placeholder values for pole direction (set arbitrarily to line up with the ecliptic north pole in J2000 coordinates.)