KPL/FK \beginlabel PDS_VERSION_ID = PDS3 RECORD_TYPE = "STREAM" RECORD_BYTES = "N/A" ^SPICE_KERNEL = "nh_shape_v001u.tf" MISSION_NAME = "NEW HORIZONS" SPACECRAFT_NAME = "NEW HORIZONS" DATA_SET_ID = "NH-J/P/SS-SPICE-6-V1.0" KERNEL_TYPE_ID = FK PRODUCT_ID = "nh_shape_v001u.tf" PRODUCT_CREATION_TIME = 2023-01-16T00:00:00 PRODUCER_ID = "SWRI" MISSION_PHASE_NAME = "N/A" PRODUCT_VERSION_TYPE = ACTUAL PLATFORM_OR_MOUNTING_NAME = "N/A" START_TIME = "N/A" STOP_TIME = "N/A" SPACECRAFT_CLOCK_START_COUNT = "N/A" SPACECRAFT_CLOCK_STOP_COUNT = "N/A" TARGET_NAME = "ASTEROID 486958 (2014 MU69)" INSTRUMENT_NAME = "N/A" NAIF_INSTRUMENT_ID = "N/A" SOURCE_PRODUCT_ID = "N/A" NOTE = "See comments in the file for details" OBJECT = SPICE_KERNEL INTERCHANGE_FORMAT = ASCII KERNEL_TYPE = FRAMES DESCRIPTION = "NH frames kernel. Map of surface names to IDs for Arrokoth. " END_OBJECT = SPICE_KERNEL END \endlabel New Horizons Arrokoth DSK Surface ID Codes ======================================================================== This kernel contains a set of New Horizons Target Body DSK Surface ID Codes for Arrokoth (asteroid 486958, 2014 MU69, NAIF body code 2486958). Version and Date ======================================================================== Version 1 - 2022 April 5 - Ross Beyer / SETI Institute & NASA Ames First version. This file is referenced in the DSK files within this dataset under a prior, internal name: mu69_shape_v01.tf It was also released in a small-bodies (SBN) PDS dataset, nh-a-lorri_mvic-5-geophys-v1.0, under a different name: nh_shape_v01.tf References ======================================================================== 1. ``Kernel Pool Required Reading'' 2. ``DS-Kernel Required Reading'' 3. Porter, Simon; Beyer, Ross; Keane, James; Umurhan, Orkan; Bierson, Carver; Grundy, William; Buie, Marc; Showalter, Mark; Spencer, John; Stern, Alan; Weaver, Hal; Olkin, Catherine; Parker, Joel; and Verbiscer, Anne. 2019. The Shape and Pole of (486958) 2014 MU69. EPSC-DPS Joint Meeting 2019, held 15-20 September 2019 in Geneva, Switzerland, id. EPSC-DPS2019-311. https://ui.adsabs.harvard.edu/abs/2019EPSC...13..311P/abstract 4. Beyer, R. A., et al. 2019. Stereo Topography of KBO (486958) 2014 MU69. EPSC-DPS Joint Meeting 2019, held 15-20 September 2019 in Geneva, Switzerland, id. EPSC-DPS2019-849. https://ui.adsabs.harvard.edu/abs/2019EPSC...13..849B/abstract 5. Spencer, J. et al. 2020. The geology and geophysics of Kuiper Belt object (486958) Arrokoth. Science Vol. 367, Issue 6481, eaay3999 DOI: 10.1126/science.aay3999 https://ui.adsabs.harvard.edu/abs/2020Sci...367.3999S/abstract Contact Information ======================================================================== NAIF at JPL: Boris Semenov (818) 354-8136 Boris.Semenov@jpl.nasa.gov 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. The SPICELIB routine FURNSH and CSPICE function furnsh_c load a kernel file into the kernel pool as shown below. CALL FURNSH ( 'frame_kernel_name' ) furnsh_c ( "frame_kernel_name" ); This file was created and may be updated with a text editor or word processor. Definition Section ======================================================================== This section contains name to ID mappings for the New Horizons target body DSK surfaces. These mappings are supported by all SPICE toolkits with integrated DSK capabilities (version N0066 or later). Version 1 NH_MU69_FR2KF_HIPOLY_V1 This is Simon Porter's shape model as of 2019-04-16. It was discussed separately in the Porter et al. (2019) abstract [3], and appears as a download in the Supplemental Material to the Spencer el al. (2020) paper [5]. NH_MU69_FR2KF_LOPOLY_V1 This is just a simplified version of NH_MU69_FR2KF_HIPOLY_V1 NH_MU69_ASP_CA04_06_ICP_SMOOTH_V1 The surface represented in this file was created from running the Ames Stereo Pipeline (ASP) on stacked, deconvolved versions of the CA04 and CA06 observations. The deconvolved version of CA04 had to be 2x reduced so that the pixels could be placed back into the original image and processed. The resulting model was cleaned and obviously bad edge points were eroded. An Iterated Closest Point (ICP) algorithm was run to match this model with the spin-negative face of NH_MU69_FR2KF_HIPOLY_V1 as well as possible. The ASP stereo terrain was treated as a rigid object and fitted as best as possible. Additional edge artifacts were trimmed back, and smoothing applied. This model was discussed separately in the Beyer et al. (2019) abstract [4], and appears as a download in the Supplemental Material to the Spencer el al. (2020) paper [5]. NH_MU69_MERGED_V1 The NH_MU69_FR2KF_HIPOLY_V1 surface had its ventral surface eroded so that there were no overlaps between it and the NH_MU69_ASP_CA04_06_ICP_SMOOTH_V1 surface. These two surfaces were then manually joined together with polygons. Local smoothing was then applied to the seam to provide a smooth join. Since the stereo model has a much smoother transition at the neck, the equatorial region of the neck in NH_MU69_FR2KF_HIPOLY_V1 was also smoothed to provide a better transition from the stereo model to the shape model. The +Z part of the neck was left as a cusp. This model was discussed separately in the Beyer et al. (2019) abstract [4]. \begindata NAIF_SURFACE_NAME += 'NH_MU69_FR2KF_HIPOLY_V1' NAIF_SURFACE_CODE += 1248695800 NAIF_SURFACE_BODY += 2486958 NAIF_SURFACE_NAME += 'NH_MU69_FR2KF_LOPOLY_V1' NAIF_SURFACE_CODE += 1248695801 NAIF_SURFACE_BODY += 2486958 NAIF_SURFACE_NAME += 'NH_MU69_ASP_CA04_06_ICP_SMOOTH_V1' NAIF_SURFACE_CODE += 1248695802 NAIF_SURFACE_BODY += 2486958 NAIF_SURFACE_NAME += 'NH_MU69_MERGED_V1' NAIF_SURFACE_CODE += 1248695803 NAIF_SURFACE_BODY += 2486958 \begintext