Hera FK files =========================================================================== This ``aareadme.txt'' file describes the contents of the kernels/fk directory of the Hera SPICE Kernel Dataset. It was last modified on April 26, 2024 by Alfredo Escalante, ESAC/ESA. Brief Summary ----------------------------------------------------------------------------- This directory contains the SPICE Frames Definition Kernel files for the Hera spacecraft, its structures, and science instruments, as well as for the Ground Earth Stations. Moreover, it contains frame definitions for science operations and for data analysis and scientific investigations. File naming conventions ----------------------------------------------------------------------------- The following table provides information on which file contains which frames, their file naming conventions and some particular details: File Contents --------------------------- ----------------------------------------- earthfixeditrf93.tf Makes the ITRF93 frame coincide with the Earth fixed reference frame. estrack_vNN.tf ESA Ground Stations topocentric frames. rssd0002.tf Cross-mission frames kernel that defines frames of interest not ``built'' in the SPICE toolkit. hera_ops_vNN.tf Hera science operations frames. hera_sc_didymain_npo_vNN.tf Mapping/overwrite of HERA_SPACECRAFT to Hera Didymain Nadir-Power-Optimized frame. hera_vNN.tf Hera spacecraft, structures, instruments and sensors frames. hera_juventas_vNN.tf Juventas cubesat, structures, instruments and sensors frames. hera_milani_vNN.tf Milani cubesat, structures, instruments and sensors frames. hera_dsk_surfaces_vNN.tf Hera Surface definitions for Digital Shape Kernels. where NN version number -- two digits (required) If multiple versions of a Frames Kernel file are provided, always use the latest version (unless earlier version is needed for some special reasons.) Current FK Kernels Set ----------------------------------------------------------------------------- earthfixeditrf93.tf SPICE FK file that makes the ITRF93 frame coincide with the Earth fixed reference frame. estrack_vNN.tf SPICE FK file that provides topocentric frames for the ESA Ground Stations. Created by the ESA SPICE Service. rssd0002.tf SPICE FK file defining a number of cross-mission frames that could be used by any of the users of any of the ESA planetary missions and that are not ``built'' in the SPICE toolkit. hera_ops_vNN.tf SPICE FK file that provides Hera science operations frames. Created by the ESA SPICE Service. hera_sc_didymain_npo_vNN.tf SPICE FK file that provides Mapping/overwrite of HERA_SPACECRAFT to Hera Didymos Nadir-Power-Optimized frame. Created by the ESA SPICE Service. hera_vNN.tf SPICE FK file that provides Hera spacecraft, structures, instruments and sensors frames. Created by the ESA SPICE Service. hera_juventas_vNN.tf SPICE FK file that provides Juventas cubesat, structures, instruments and sensors frames. Created by the ESA SPICE Service. hera_milani_vNN.tf SPICE FK file that provides Milani cubesat, structures, instruments and sensors frames. Created by the ESA SPICE Service. hera_dsk_surfaces_vNN.tf SPICE FK file containing surface definitions for the Digital Shape Kernels of Didymos, Dimorphos, and Hera. Other directory contents ----------------------------------------------------------------------------- aareadme.txt This file. Particulars ----------------------------------------------------------------------------- Important information about the Mapping/overwrite frame definition kernels (hera_sc_didymos_npo_vNN.tf): These frames have been implemented to overwrite the HERA_SPACECRAFT frame definition provided in the Hera Frames Definitions kernel (hera_vNN.tf) and map it to the HERA_DIDYMOS_NPO frames defined in the Hera Science Operations Frames Definitions kernel (hera_ops_vNN.tf). In order to make use of these frames' kernel, ONLY ONE of these files MUST BE LOADED AFTER the Hera frames definition kernel and the Hera Science Operations Frames Definition kernel. NOTE THAT BY USING ANY OF THESE KERNEL, THE HERA_SPACECRAFT FRAME WILL BE MAPPED TO THE CORRESPONDING SCIENCE OPERATIONS FRAME, AND ANY CK PROVIDING ORIENTATION FOR THE HERA_SPACECRAFT FRAME WILL NOT BE USED BY THE APPLICATION SOFTWARE, EVEN IF IT IS LOADED IN THE KERNEL POOL. Kernel File Details ----------------------------------------------------------------------------- The most detailed description of the data in an FK file is provided in metadata included inside the descriptive text areas of the file. This information can be viewed using any text editor. Contact Information ----------------------------------------------------------------------------- If you have any questions regarding this directory or its contents, please contact SPICE support at ESAC: Alfredo Escalante Lopez (+34) 91-8131-429 spice@sciops.esa.int or NAIF at JPL: Boris Semenov (818) 354-8136 Boris.Semenov@jpl.nasa.gov References and required readings ----------------------------------------------------------------------------- 1. ``Frames Required Reading'', NAIF Document 2. ``Kernel Pool Required Reading'', NAIF 3. ``C-Kernel Required Reading'', NAIF End of aareadme file.