PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2009-10-26 NOTE = "SP-Kernel Information" END_OBJECT = TEXT END General information about SPICE SP-kernels ========================================== The purpose of the SP-kernel (SPK), which stands for S(pacecraft) and P(lanet) Kernel, is to allow ephemerides for any collection of solar system bodies, spacecraft or any other objects in 3D space to be combined under a common file format, and accessed by a common set of subroutines. SP Kernels provide the state of a target relative to its center of motion, where ``state'' implies Cartesian position and velocity at a requested epoch. The SPK format is supported by a collection of subroutines that are part of the SPICELIB library, the major component of the SPICE Toolkit. These subroutines can be integrated into a user's application programs. Information about obtaining the SPICE Toolkit is located in the ``software'' subdirectory of the main directory of this dataset. To use SP-kernels, a Leapseconds Kernel (LSK) is required. Also, to use SP-Kernels containing states defined relative to non-inertial or project-defined frames, a Frames Kernel (FK) and/or Planetary Constants Kernel (PcK) are required. Refer to the SPK Required Reading (spk.req) document provided with the Toolkit or available from the NAIF Node of the PDS, to get more information on how to access SP-kernel data. Hayabusa SP-kernels Provided in This Data Set ============================================= This directory contains the SPICE SP-Kernel files for the Hayabusa spacecraft, Hayabusa mission target asteroid Itokawa, and solar system bodies. All files are in IEEE big endian binary format. The following files are present in this directory. (Only the leading portions of the file names are shown; the file name extensions of the binary SPK files are always ``.bsp''): hayabusa_YYYYMMDD_yyyymmdd_v01 SPK files containing the trajectory of the Hayabusa spacecraft relative to the asteroid Itokawa based on spacecraft telemetry data, covering short periods of the surveying and collection phase of the mission, created during operations by the Hayabusa Joint Science Team. YYYYMMDD and yyyymmdd in the file name identify the period covered by the file. hayabusa_itokawarendezvous_v01 SPK file containing the trajectory of the Hayabusa spacecraft relative to the asteroid Itokawa based on spacecraft telemetry data, covering most of the surveying and collection phase of the mission, created at the end of the phase by the Hayabusa Joint Science Team. hay_jaxa_050916_051119_v1n SPK file containing the trajectory of the Hayabusa spacecraft relative to the asteroid Itokawa based on the spacecraft telemetry, covering most of the surveying and collection phase of the mission, created by NAIF at the time of archive preparation by re-packaging and touching up the data from the SPK file hayabusa_itokawarendezvous_v01. bsp. hay_osbj_050911_051118_v1 SPK file containing the trajectory of the Hayabusa spacecraft relative to the asteroid Itokawa based on combining LIDAR, AMICA, and shape model data, covering most of the surveying and collection phase of the mission, created by Dr. Olivier S. Barnouin-Jha, APL as a part of the LIDAR data reduction activity. The original name of this file was Sept-Nov_SPK.bsp. hay_osbj_050911_051118_v1n SPK file containing the trajectory of the Hayabusa spacecraft relative to the asteroid Itokawa based on combining LIDAR, AMICA, and shape model data, covering most of the surveying and collection phase of the mission, created by NAIF at the time of archive preparation by re-packaging and touching up the data from the SPK file hay_osbj_050911_051118_v1.bsp. itokawa_1989_2010 SPK file containing the ephemeris of the asteroid Itokawa relative to the Sun, created by the Hayabusa Joint Science Team using the JPL SSD group's Horizons system during the surveying and collection phase of the mission. The original name of this was itokawa_1989-2010.bsp. sb_25143_140 SPK file containing the ephemeris of the asteroid Itokawa relative to the Sun, created and officially delivered to the Hayabusa project by the JPL SSD group. The original name of this was sb-25143-140.bsp. de403s SPK file containing DE403 ephemerides of the Sun, Earth, Moon, and planetary system barycenters, created by NAIF. In most cases only these SPK files, listed in this order de403s.bsp sb_25143_140.bsp hay_jaxa_050916_051119_v1n.bsp hay_osbj_050911_051118_v1n.bsp should be loaded into a user's application to process data for the surveying and collection phase of the mission. Kernel File Details =================== The most detailed description of the data in each SPK file is provided in metadata included inside the comment area of the file. This information can be viewed using the utility programs COMMNT and SPACIT included in the SPICE Toolkit.