PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM LABEL_REVISION_NOTE = " 2016-04-30 BTCarcich Added heliospheric FKs 2016-04-30 BTCarcich Added Y (u-z) version designator 2016-04-30 BTCarcich Made nh_soc_misc version generic 2023-01-16 BEnke - Updated MU69 NAIF_BODY_NAME and NAIF_BODY_CODE - Added new shape model name-to-ID mapping kernel, nh_shape_v001u.tf " OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2014-07-01 NOTE = "FRAMES Kernel Information" END_OBJECT = TEXT END General information about SPICE FRAMES kernels ============================================== In the SPICE system, the FRAMES kernel (FK) contains information required to define reference frames used in a particular mission. This information includes sources of orientation and origin location for these frames and inter-connections between these frames and other frames supported within the SPICE system. The frame definitions information contained in the FK files can be used by a collection of subroutines that are part of the SPICELIB library, the major component of the NAIF Toolkit. These subroutines can be integrated into user application programs. Information about obtaining the SPICE Toolkit is located in the "software" subdirectory of the main directory of this dataset. Refer to the Frames Required Reading (frames.req) document provided with the toolkit or available from the NAIF Node of the PDS, to get more information on how to access FK data. New Horizons FRAMES Kernels Contained in This Directory ====================================================== The following Frames Kernel files are included on this volume (only the name portion of the file name is shown; the extension of all file names is ".tf"): nh_vNNNY The New Horizons Frames kernel files containing frame definitions for the spacecraft and its instrumentation. nh_soc_misc_vNNNY This frame kernel contains the NAIF body name/code translation for miscellaneous targets that will show up in some NH FITS file headers due to targets added that are not in the project Frames Kernel (nh_vNNNY) or other project SPICE kernels. nh_shape_vNNNY This frame kernel maps surface names to IDs for Arrokoth shape models. It was ported from a KEM1 K4 derived dataset in the small bodies PDS node. The name of the file has changed, but the contents are the same. heliospheric_vNNNY Dynamic Heliospheric Coordinate Frames developed by William Thompson of NASA Goddard Space Flight Center for the NASA STEREO mission and used in ephemeris calculations for the SWAP instrument data set. The version number NNN is consistent with the internal version number. N.B. heliospheric_v003, although not the latest version, was the one used to calculate the spacecraft trajectories in the document/traj/ directory of NH SWAP data sets delivered ca. April, 2016. It has an additional reference frame, HEE_ROSETTA, that is not in heliospheric_v004u. However, for the purpose of and reference frames used in the generation of those SWAP trajectories, there is no ***FUNCTIONAL*** difference between delivered versions 003 and 004u. New Horizons FK File Naming Scheme ================================= The New Horizons FKs provided on this volume are named according to schemes similar to the following: ..._vNNNY.tf where: vNNN is the file version number; Y is an optional designator (u through z) for when edits were applied, for this data set, to the canonical version obtained from another source. Refer to the comments in the kernel for details. If multiple versions of an FK file are provided, always use the latest version (unless an earlier version is needed for some special reasons.) Kernel File Details =================== The most detailed description of the data in an FK file is provided in metadata included inside the descriptive text area of the file. This information can be viewed using any text editor. Caveats and comments for the heliospheric FKs ============================================= The aberration correction argument to SPKEZ/SPKEZR should be set to "NONE" to avoid small errors (nanoradians) when using dynamic frames from this file and a different OBSERVER than that in FRAME_18ccple_CENTER (or than Earth, if ECLIPDATE is part of the frame definition). The ECLIPDATE frame with a different ID and identical definition exists in FKs in several PDS data sets The IAU_SUN frame used in some of these frames will give correct orientaion only when used with generic PCK pck00009.tpc or later. SPICE J2000 is aligned with ICRF.