Data Set Information
DATA_SET_NAME ROSETTA SPICE KERNELS V1.0
DATA_SET_ID ROS-E/M/A/C-SPICE-6-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION 1. SPICE System Overview : SPICE data contain geometric and other ancillary information needed to recover the full value of science instrument data. In particular, SPICE kernels provide spacecraft and planetary ephemerides, instrument mounting alignments and spacecraft orientation. Data needed for relevant time conversions is also included. SPICE was designed by the Navigation and Ancillary Information Facility (NAIF) to aid scientists and engineers with ancillary and engineering data. This data comes from a wide range of sources such as the spacecraft, the mission control center and the designers of the spacecraft and its instruments. The ancillary data comprises information on data acquisition; position and orientation of the spacecraft at the time of acquisition; information on the target, such as location, shape and orientation; reference frame specifications and time conversion data. The primary SPICE data sets are often called 'kernels' or 'kernel files'. These kernels are composed of ancillary information, which has been created in such a way as to allow easy access and correct usage by the space science and engineering communities. In addition to the kernels, there is software provided, known as the SPICE toolkit, along with standards, documentation and software support. The SPICE toolkit and documentation can be found on: http://naif.jpl.nasa.gov/naif/ The SPICE toolkit was freely offered to the worldwide space science and space mission engineering communities at the time this data set was released. The few rules governing its use are posted on the 'Rules' page of the NAIF website: http://naif.jpl.nasa.gov/naif/rules.html SPICE is used on a number of space missions, such as ESA's Mars Express, SMART-1, Venus Express and Rosetta missions; NASA's Mars Global Surveyor, Stardust, Cassini, Mars Exploration Rovers, Mars Reconnaissance Orbiter and Deep Impact. The SPICE system has been produced and is maintained by Caltech's Jet Propulsion Laboratory under contract to the U.S. National Aeronautics and Space Administration. For an additional explanation of the SPICE system, please consult SPICE_INST.CAT 2. Data Producers and Other Key Personnel : The Rosetta SPICE data set has been produced by Acton, C. (NAIF/JPL) Bachman, N. (NAIF/JPL) Semenov, B. (NAIF/JPL) Vazquez, J.L. (RSSD/ESA) Zender, J. (RSSD/ESA) and archived by Vazquez, J.L. (RSSD/ESA) 3. The Rosetta SPICE dataset : The Rosetta SPICE dataset consists of several SPICE kernels, organised as follows: * CK kernels. This kernels contain information about orientation of the space vehicle or any articulating structure on it. More information on the CK kernels in this dataset is provided in CKINFO.TXT. * FK kernels. Reference frame specifications. Definitions of, and specifications of, relationships between reference frames (coordinate systems). Among the frames kernels included, there are kernels that specify reference frames related to the earth and the spacecraft. More information on the FK kernels in this dataset is provided in FKINFO.TXT. * IK kernels. Kernels that hold intrument information, such as field of view or internal timing. There is a IK kernel for every instrument, except for RSI. More information on the IK kernels in this dataset is provided in IKINFO.TXT. * LSK kernel. This kernels hold a table with the leapseconds used to convert between ET and UTC. If there are multiple LSK kernels in this dataset, the latest kernel supersedes the previous ones. More information on the LSK kernel(s) in this dataset is provided in LSKINFO.TXT. * PCK kernels. These kernels provide information about Solar System bodies orientation and shape, and possibly parameters for gravitational, atmospheric or rings models. The dataset contains PCK kernels for the planets, their satellites, and the asteroids Lutetia and Steins. More information on the PCK kernels in this dataset is provided in PCKINFO.TXT. * SCLK kernel. This kernel (spacecraft clock coefficients) allows for conversion between ET and spacecraft clock. If there are multiple LSK kernels in this dataset, the latest kernel supersedes the previous ones. More information on the SCLK kernel(s) in this dataset is provided in SCLKINFO.TXT. * SPK kernels. Kernels with information about ephemeris (position and velocity) of the spacecraft and solar system bodies. The dataset provides such information for the planets, the Sun, the Moon, the comet (CHURYUMOV-GERASIMENKO), the two fly-by asteroids (Lutetia and Steins), the fly-by comet (Tempel 1), the New Norcia tracking Station, and the spacecraft. More information on the SPK kernels in this dataset is provided in SPKINFO.TXT. 3.1 - Origin of the kernels. a) Generic kernels provided by NAIF. PCK, LSK and some of the SPK (those which don't hold information about the spacecraft) kernels are provided by NAIF. b) Other kernels provided by NAIF. The instrument kernels (IK) have been developed by Boris Semenov (NAIF), in collaboration with the intrument teams and RSSD/ESA. c) Kernels generated with ESOC Ancillary Data. ESOC ancillary data are the main source of information required to create SPICE kernels for attitude (CK), orbit (SPK) and time (SCLK) information, as well as orientation for the High Gain Antenna and the Solar Panels. See next chapter (3.2) for a more detailed explanation on how these kernels are generated. Some PCK kernels for asteroids and comets have also been created using ESOC data. 3.2 - Creation of SPK, CK and SCLK kernels from ESOC Ancillary Data. Orbit Data. ---------- Eight different types of data products are provided by ESOC: ORHR, ORHO, ORHS, ORER, ORMR, ORFR, ORGR and ORWR. SPICE kernels corresponding to ORHR, ORWR, ORHS, ORHW and ORHO will be provided in this data set. The ORHR SPK file covers the cruise phase from launch to the rendezvous with the comet and provides the orbit data as heliocentric states. There will be several versions of the ORHR product; the user shall use the file with the higher version number, since it will be the most up to date one. The ORHW SPK file provides orbit data, centered in the Sun, for the comet Churyumov-Gerasimenko. The ORHS SPK file provides orbit data, centered on the Sun, for the asteroid 21 Lutetia. The ORHO SPK file provides orbit data, centered on the Sun, for the asteroid 2867 Steins. During near comet operations, one spacecraft orbit file (ORHR) will be provided, containing comet-centric states with respect to the Earth mean equator of J2000. The file will cover the spacecraft orbit from comet rendezvous up to the end of the current planning period. For each release of the dataset, only the relevant kernels are delivered. For example, for the first release, ORHO and ORHS files will not be delivered, since that release covers a time period previous to the two asteroid flybys. Attitude Data. ------------- Attitude data are provided for all mission phases except for safe modes, for the past and the near future. The attitude is provided in several records, called segments, each covering a specific time span. These segments have no overlap, but there may be gaps between the segments, and even gaps in the segments. Time Correlation Data. --------------------- Time Correlation is one of the most critical pieces of information needed for the use of the SPICE system within the Rosetta mission. This information allows the conversion between the Rosetta S/C Clock time and UTC time. ESOC always provide predicted and reconstituted orbit data, but only predicted attitude data. These products are the source of the CK and SPK kernels. ESOC delivers time correlation data which are the source for the SCLK kernel. An automated system, called ADCS (Automatic Data Conversion System) is responsible for the generation of CK, SPK and SCLK kernels from the ESOC flight dynamics data. ADCS detects when a new product was generated or a new time correlation packet was available, and run a series of processes in order to create the proper kernels. ADCS uses the SPICE toolkit in order to fulfill its task. It runs in a server physically located at ESTEC until December 2007; after that date, the server is located at ESAC. 3.3 - Using the SPICE kernels. At least a basic knowledge of the SPICE system is needed in order to use this kernels. The SPICE toolkit provides versions in Fortran (SPICELIB), C (CSPICE), Matlab (Mice) and IDL (icy), and the user can choose any one that suits him/her. The SPICELIB routine FURNSH, CSPICE function furnsh_c, and icy routine cspice_furnsh load a kernel file into the kernel pool as shown below. CALL FURNSH ( 'kernel_name' ) furnsh_c ( 'kernel_name' ); cspice_furnsh, 'kernel_name' In the case when two or more files contain data overlapping in time for a given object, for binary kernels, the file loaded last takes precedence. If two (or more) text kernels assign value(s) using the ':' operator to identical keywords, the data value(s) associated with the last loaded occurrence of the keyword are used -all earlier values have been replaced with the last loaded value(s). Loading Kernel Files into a SPICE-based Application : The following list of kernels in SPICE meta-kernel format can be used with a SPICE-based application running on a UNIX workstation to load Rosetta SPICE data provided in this data set together (note that the logical path provided in the PATH_VALUES keyword and pointing to the volume root directory should be changed to the actual path of the volume root directory on the system where the volume is mounted): When there are two or more kernels that cover the same time interval (as is the case here for the .BSP and .BC kernels) the last kernel loaded is the one used by the SPICE software for computations in the interval or overlap.
DATA_SET_RELEASE_DATE 2006-12-22T00:00:00.000Z
START_TIME 2004-03-02T09:26:21.583Z
STOP_TIME 2010-10-03T12:01:06.183Z
MISSION_NAME INTERNATIONAL ROSETTA MISSION
MISSION_START_DATE 1995-03-01T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME
TARGET_TYPE
INSTRUMENT_HOST_ID RO
INSTRUMENT_NAME SPICE KERNELS
INSTRUMENT_ID SPICE
INSTRUMENT_TYPE UNKNOWN
NODE_NAME Navigation and Ancillary Information Facility
ARCHIVE_STATUS SUPERSEDED
CONFIDENCE_LEVEL_NOTE The SPICE kernels in this dataset are either provided by NAIF (for instance, kernels containing parameters describing the planets, or the LSK kernel containing information about leapseconds) or calculated from the orbit and attitude data information generated by ESOC. In both cases the archive team are confident that the SPICE data is correct and accurate within the precision provided by the software and the instruments at the time the data was archived
CITATION_DESCRIPTION Vazquez-Garcia, J.L., Zender, J., and B. Semenov, ROSETTA SPICE KERNELS V1.0, ROS-E/M/A/C-SPICE-6-V1.0, European Space Agency, 2007.
ABSTRACT_TEXT SPICE deals with ancillary data needed to support the planning for, and analysis of, science instrument data. As well as software (the SPICE toolkit) and documentation, SPICE provides data files, called kernels, that contain ancillary information which has been created in such a way as to allow easy access and correct usage by the space science and engineering communities.
PRODUCER_FULL_NAME JOSE LUIS VAZQUEZ-GARCIA
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