ExoMars2016 FK files =========================================================================== This ``aareadme.txt'' file describes the contents of the kernels/fk directory of the ExoMars2016 SPICE Kernel Dataset. It was last modified on July 22, 2021 by Alfredo Escalante Lopez, ESAC/ESA. Brief Summary -------------------------------------------------------- This directory contains the SPICE Frames Definition Kernel files for the ExoMars 2016 TGO 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 --------------------------- ----------------------------------------- earthfixediau.tf Makes the IAU_EARTH coincide with the Earth fixed reference frame. earthfixeditrf93.tf Makes the ITRF93 frame coincide with the Earth fixed reference frame. estrack_vNN.tf ESA Ground Stations topocentric frames. new_norcia_topo.tf ESA New Norcia topocentric frame. earth_topo_050714.tf NASA DSN Ground Stations topocentric frames. rssd0002.tf Cross-mission frames kernel that defines frames of interest not ``built'' in the SPICE toolkit. em16_tgo_ops_vNN.tf ExoMars 2016 TGO science operations frames. em16_tgo_vNN.tf ExoMars2016 TGO spacecraft, structures, instruments and sensors frames. em16_dsk_surfaces_vNN.tf ExoMars2016 TGO Surface definitions for Digital Shape Kernels. where NN version number -- two digits (required; e.g. 01) 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 -------------------------------------------------------- earthfixediau.tf SPICE FK file that makes the IAU_EARTH frame coincide with the Earth fixed reference frame. Created by NAIF, JPL. 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 (ESS). earthstns_ru_YYYYMMDD.tf SPICE FK file that contains definitions for topocentric reference frames for the Russian ground stations. Created by IKI. new_norcia_topo.tf SPICE FK kernel for the topocentric reference frame for the ESA 35m tracking antenna at New Norcia. Created by the ESA SPICE Service (ESS). earth_topo_050714.tf SPICE FK kernel for the topocentric reference frames for the Deep Space Network (DSN) stations. This kernel was released on the date indicated in the filename. Created by NAIF, JPL. 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. Created by the ESA SPICE Service (ESS). em16_tgo_ops_vNN.tf SPICE FK file that provides TGO science operations frames. Created by the ESA SPICE Service (ESS). em16_tgo_sc_mars_noa_vNN.tf SPICE FK file that provides Mapping/overwrite of TGO_SPACECRAFT to TGO Mars Nadir-Orbit-Aligned frame. Created by the ESA SPICE Service (ESS). em16_tgo_sc_mars_npo_vNN.tf SPICE FK file that provides Mapping/overwrite of TGO_SPACECRAFT to TGO Mars Nadir-Power-Optimized frame. Created by the ESA SPICE Service (ESS). em16_tgo_vNN.tf SPICE FK file that provides TGO spacecraft, structures, instruments and sensors frames. Created by the ESA SPICE Service (ESS). em16_dsk_surfaces_vNN.tf SPICE FK file containing surface definitions for the Digital Shape Kernels of Phobos, Deimos, Mars and TGO. Created by the ESA SPICE Service (ESS). em16_tgo_relay_locations_vNN.tf SPICE FK file containing a set of TGO spacecraft relay locations frame definitions for selected Rovers and Landers. Created by ExoMars2016 SOC. Other directory contents -------------------------------------------------------- aareadme.txt This file. Particulars -------------------------------------------------------- Important information about the Mapping/overwrite frame definition kernels (em16_tgo_sc_mars_noa_vNN.tf and em16_tgo_sc_mars_npo_vNN.tf): These frames have been implemented to overwrite the TGO_SPACECRAFT frame definition provided in the ExoMars 2016 Frames Definitions kernel (em16_tgo_vNN.tf) and map it to the TGO_MARS_NOA/TGO_MARS_NPO frames defined in the ExoMars 2016 Science Operations Frames Definitions kernel (em16_tgo_ops_vNN.tf). In order to make use of these frames' kernel, ONLY ONE of these files MUST BE LOADED AFTER the ExoMars2016 frames definition kernel and the ExoMars 2016 Science Operations Frames Definition kernel. NOTE THAT BY USING ANY OF THESE KERNEL, THE TGO_SPACECRAFT FRAME WILL BE MAPPED TO THE CORRESPONDING SCIENCE OPERATIONS FRAME, AND ANY CK PROVIDING ORIENTATION FOR THE TGO_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 file contact the ESA SPICE Service (ESS) at ESAC: Alfredo Escalante Lopez (+34) 91-8131-429 spice@sciops.esa.int or SPICE support at IKI: Alexander Abbakumov +7 (495) 333-40-13 aabbakumov@romance.iki.rssi.ru or NAIF at JPL: Boris Semenov +1 (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.