KPL/FK Frame (FK) kernel file for JUICE Spacecraft Measured frame mapping =============================================================================== This frames kernel overwrites the JUICE spacecraft frame (JUICE_SPACECRAFT) definition from [3] and maps it to the JUICE spacecraft measured frame (JUICE_SPACECRAFT_MEAS) defined in [3]. This allows the user to use the existing alignments and instrument frame definitions in the JUICE frames kernel (see ref [3]) to perform instrument specific mission analysis and attitude dependent science opportunity identification using the so-called measured CKs generated from housekeeping telemetry. Please refer to the section ``Using this frame'' for further details. NOTE THAT BY USING THIS KERNEL, THE JUICE_SPACECRAFT FRAME WILL BE MAPPED TO THE JUICE_SPACECRAFT_MEAS FRAME, AND ANY CK PROVIDING ORIENTATION FOR THE JUICE_SPACECRAFT FRAME WILL NOT BE USED BY THE APPLICATION SOFTWARE, EVEN IF IT IS LOADED IN THE KERNEL POOL. Version and Date ------------------------------------------------------------------------------- Version 0.1 -- October 21, 2022 -- Marc Costa Sitja, ESAC/ESA Initial version. References ------------------------------------------------------------------------------- [1] "Frames Required Reading" [2] "Kernel Pool Required Reading" [3] JUICE Frames Definition Kernel (FK), latest version. Contact Information ------------------------------------------------------------------------------- If you have any questions regarding this file contact the ESA SPICE Service (ESS) at ESAC: Alfredo Escalante Lopez (+34) 91-8131-429 spice@sciops.esa.int or the JUICE Science Operations Center at ESAC: Marc Costa Sitja (+34) 646-746-711 Marc.Costa@ext.esa.int Implementation Notes ------------------------------------------------------------------------------- This file is used by the SPICE system as follows: programs that make use of this frame kernel must "load" the kernel normally during program initialization. Loading the kernel associates the data items with their names in a data structure called the "kernel pool". The SPICELIB routine FURNSH loads a kernel into the pool as shown below: FORTRAN: (SPICELIB) CALL FURNSH ( frame_kernel_name ) C: (CSPICE) furnsh_c ( frame_kernel_name ); IDL: (ICY) cspice_furnsh, frame_kernel_name MATLAB: (MICE) cspice_furnsh ( 'frame_kernel_name' ) PYTHON: (SPICEYPY)* furnsh( frame_kernel_name ) In order for a program or routine to extract data from the pool, the SPICELIB routines GDPOOL, GIPOOL, and GCPOOL are used. See [2] for more details. This file was created and may be updated with a text editor or word processor. * SPICEYPY is a non-official, community developed Python wrapper for the NAIF SPICE toolkit. Its development is managed on Github. It is available at: https://github.com/AndrewAnnex/SpiceyPy Using this frame ------------------------------------------------------------------------------- This frames have been implemented to overwrite the JUICE_SPACECRAFT frame definition provided in the JUICE Frames Definitions kernel ([3]) and map it to the JUICE_SPACECRAFT_MEAS frame defined in the JUICE Frames Definitions kernel ([3]). In order to make use of this frames kernel, this file MUST BE LOADED AFTER the JUICE frames definition kernel. A metakernel defined to use this file should look like this: ... $DATA/fk/juice_v01.tf $DATA/fk/juice_sc_meas_v01.tf ... (*) the example presents version 0.1 of the JUICE frames kernel. Newer versions of these files will produce the same results. NOTE THAT BY USING THIS KERNEL, THE JUICE_SPACECRAFT FRAME WILL BE MAPPED TO THE JUICE_SPACECRAFT_MEAS FRAME, AND ANY CK PROVIDING ORIENTATION FOR THE JUICE_SPACECRAFT_PLAN FRAME WILL NOT BE USED BY THE APPLICATION SOFTWARE, EVEN IF IT IS LOADED IN THE KERNEL POOL. \begindata FRAME_-28000_CLASS = 4 TKFRAME_-28000_RELATIVE = 'JUICE_SPACECRAFT_PLAN' TKFRAME_-28000_SPEC = 'MATRIX' TKFRAME_-28000_MATRIX = ( 1 0 0 0 1 0 0 0 1 ) \begintext End of FK file.