Artemis II Orion Reconstructed SPK, JSC/FOD/NAV BET revF Solution Gap-Filler =========================================================================== Created by Boris Semenov, NAIF/JPL, July 21, 2026 using segment boundary states from the OEM file ``EM2_FODNAVBET_revF_PUBLIC.oem'' provided by Dr. Sean McArdle, JSC-CM571 created on June 9, 2026. Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the Artemis II Orion spacecraft (NAIF ID code -24) w.r.t. to Earth in the J2000 frame. Approximate Time Coverage -------------------------------------------------------- This file covers the following short time intervals corresponding to gaps in the JSC/FOD/NAV BET revF Solution SPK ``art002_rec_260402_260410_jsc_bet_revf.bsp'': Start of Interval (UTC) End of Interval (UTC) ----------------------------- ----------------------------- 2026-APR-02 22:49:21.397 2026-APR-02 22:49:59.740 2026-APR-03 00:02:39.800 2026-APR-03 00:02:48.802 2026-APR-07 00:54:48.802 2026-APR-07 00:55:00.000 2026-APR-10 23:29:00.000 2026-APR-10 23:29:59.779 2026-APR-10 23:33:34.736 2026-APR-10 23:33:44.736 Status -------------------------------------------------------- This file was created by extracting block boundary states from Orbit Ephemeris Message (OEM) file ``EM2_FODNAVBET_revF_PUBLIC.oem'' containing the reconstructed Best Estimated Trajectory (BET) revision F solution by Johnson Space Center Flight Operations Directorate Navigation Team (JSC/FOD/NAV) cleared for public release on 2026-JUL-01 (see STRIVES NF-1676 submission 20260005174), making a series of input files containing pairs of states from neighboring blocks (last state from earlier block + first state from the next block), and packaging these pairs of states into SPK Type 13 (Hermit interpolation) Degree 3 SPK segments using the MKSPK utility program version 6.1.0. The MKSPK setup files and tracebacks are provided in the Appendix 1 below. The states that were used as input are provided in the Appendix 2 below. This SPK is intended for archiving in the Planetary Data System to be used to complete coverage of the JSC/FOD/NAV BET revF SPK ``art002_rec_260402_260410_jsc_bet_revf.bsp''. Pedigree -------------------------------------------------------- The states used in this SPK were extracted from the reconstructed post-mission BET revF trajectory solution by JSC/FOD/NAV based on ground tracking/position data derived from GPS, DSN, JAXA, and SSC and modeling of gravity from the Earth, Moon, Sun, and Jupiter, translational burn delta-v's, environmental control and life support system (ECLSS) vent forces, reaction control system (RCS) thruster firing delta-v's, and solar radiation pressure (SRP) forces. Usage -------------------------------------------------------- This file should be used together with the DE430 planetary ephemeris and the BET revF SPK `art002_rec_260402_260410_jsc_bet_revf.bsp''. Contacts -------------------------------------------------------- If you have questions regarding this data contact Dr. Sean McArdle, JSC-CM571 Sean.M.McArdle@nasa.gov Boris Semenov, NAIF/JPL Boris.V.Semenov@jpl.nasa.gov Appendix 1: MKSPK Setup and Traceback -------------------------------------------------------- ******************************************************************************** MKSPK RUN DATE/TIME: 2026-07-21T11:38:02 MKSPK SETUP FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.setup MKSPK INPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.input.1 MKSPK OUTPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.bsp OUTPUT FILE STATUS: NEW FILE ******************************************************************************** \begindata LEAPSECONDS_FILE = 'naif0012.tls' SEGMENT_ID = 'ARTEMIS-2 JSC/FOD BET REVF GAPFILL' OBJECT_ID = -24 CENTER_ID = 399 REF_FRAME_NAME = 'J2000' INPUT_DATA_TYPE = 'STATES' DATA_ORDER = 'EPOCH X Y Z VX VY VZ' DATA_DELIMITER = ' ' EPOCH_STR_LENGTH = 23 LINES_PER_RECORD = 1 TIME_WRAPPER = '#' INPUT_DATA_UNITS = ( 'ANGLES = degrees' 'DISTANCES=km' ) OUTPUT_SPK_TYPE = 13 POLYNOM_DEGREE = 3 PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** ******************************************************************************** MKSPK RUN DATE/TIME: 2026-07-21T11:38:02 MKSPK SETUP FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.setup MKSPK INPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.input.2 MKSPK OUTPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.bsp OUTPUT FILE STATUS: EXISTING FILE ******************************************************************************** \begindata LEAPSECONDS_FILE = 'naif0012.tls' SEGMENT_ID = 'ARTEMIS-2 JSC/FOD BET REVF GAPFILL' OBJECT_ID = -24 CENTER_ID = 399 REF_FRAME_NAME = 'J2000' INPUT_DATA_TYPE = 'STATES' DATA_ORDER = 'EPOCH X Y Z VX VY VZ' DATA_DELIMITER = ' ' EPOCH_STR_LENGTH = 23 LINES_PER_RECORD = 1 TIME_WRAPPER = '#' INPUT_DATA_UNITS = ( 'ANGLES = degrees' 'DISTANCES=km' ) OUTPUT_SPK_TYPE = 13 POLYNOM_DEGREE = 3 PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** ******************************************************************************** MKSPK RUN DATE/TIME: 2026-07-21T11:38:02 MKSPK SETUP FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.setup MKSPK INPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.input.3 MKSPK OUTPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.bsp OUTPUT FILE STATUS: EXISTING FILE ******************************************************************************** \begindata LEAPSECONDS_FILE = 'naif0012.tls' SEGMENT_ID = 'ARTEMIS-2 JSC/FOD BET REVF GAPFILL' OBJECT_ID = -24 CENTER_ID = 399 REF_FRAME_NAME = 'J2000' INPUT_DATA_TYPE = 'STATES' DATA_ORDER = 'EPOCH X Y Z VX VY VZ' DATA_DELIMITER = ' ' EPOCH_STR_LENGTH = 23 LINES_PER_RECORD = 1 TIME_WRAPPER = '#' INPUT_DATA_UNITS = ( 'ANGLES = degrees' 'DISTANCES=km' ) OUTPUT_SPK_TYPE = 13 POLYNOM_DEGREE = 3 PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** ******************************************************************************** MKSPK RUN DATE/TIME: 2026-07-21T11:38:02 MKSPK SETUP FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.setup MKSPK INPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.input.4 MKSPK OUTPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.bsp OUTPUT FILE STATUS: EXISTING FILE ******************************************************************************** \begindata LEAPSECONDS_FILE = 'naif0012.tls' SEGMENT_ID = 'ARTEMIS-2 JSC/FOD BET REVF GAPFILL' OBJECT_ID = -24 CENTER_ID = 399 REF_FRAME_NAME = 'J2000' INPUT_DATA_TYPE = 'STATES' DATA_ORDER = 'EPOCH X Y Z VX VY VZ' DATA_DELIMITER = ' ' EPOCH_STR_LENGTH = 23 LINES_PER_RECORD = 1 TIME_WRAPPER = '#' INPUT_DATA_UNITS = ( 'ANGLES = degrees' 'DISTANCES=km' ) OUTPUT_SPK_TYPE = 13 POLYNOM_DEGREE = 3 PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** ******************************************************************************** MKSPK RUN DATE/TIME: 2026-07-21T11:38:02 MKSPK SETUP FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.setup MKSPK INPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.input.5 MKSPK OUTPUT FILE: art002_rec_260402_260410_jsc_bet_revf_gapfill.bsp OUTPUT FILE STATUS: EXISTING FILE ******************************************************************************** \begindata LEAPSECONDS_FILE = 'naif0012.tls' SEGMENT_ID = 'ARTEMIS-2 JSC/FOD BET REVF GAPFILL' OBJECT_ID = -24 CENTER_ID = 399 REF_FRAME_NAME = 'J2000' INPUT_DATA_TYPE = 'STATES' DATA_ORDER = 'EPOCH X Y Z VX VY VZ' DATA_DELIMITER = ' ' EPOCH_STR_LENGTH = 23 LINES_PER_RECORD = 1 TIME_WRAPPER = '#' INPUT_DATA_UNITS = ( 'ANGLES = degrees' 'DISTANCES=km' ) OUTPUT_SPK_TYPE = 13 POLYNOM_DEGREE = 3 PRODUCER_ID = 'NAIF/JPL' \begintext ******************************************************************************** Appendix 2: MKSPK inputs -------------------------------------------------------- art002_rec_260402_260410_jsc_bet_revf_gapfill.input.1: 2026-04-02T22:49:21.397 15386.708504 -13263.287887 -7047.596308 -0.699598208 4.575829025 2.460733382 2026-04-02T22:49:59.741 15359.435431 -13087.439795 -6953.020890 -0.723496825 4.596303930 2.471633469 art002_rec_260402_260410_jsc_bet_revf_gapfill.input.2: 2026-04-03T00:02:39.801 -6340.943206 5229.597062 2694.008490 -9.041312166 -2.517290515 -1.538924336 2026-04-03T00:02:48.802 -6422.159716 5206.815811 2680.125455 -9.006174231 -2.546009654 -1.553746883 art002_rec_260402_260410_jsc_bet_revf_gapfill.input.3: 2026-04-07T00:54:48.802 -133705.761990 -341147.389115 -188024.871716 -0.123060235 0.386809946 0.125364047 2026-04-07T00:55:00.000 -133707.079514 -341143.148110 -188023.311000 -0.122640007 0.386953894 0.125444288 art002_rec_260402_260410_jsc_bet_revf_gapfill.input.4: 2026-04-10T23:29:00.000 11131.828222 -3025.917049 -6016.137489 -2.264062593 5.634496015 4.759318846 2026-04-10T23:29:59.780 10992.818937 -2688.132180 -5729.677641 -2.388335261 5.666607642 4.825314696 art002_rec_260402_260410_jsc_bet_revf_gapfill.input.5: 2026-04-10T23:33:34.736 10425.725436 -1458.821999 -4665.764292 -2.908628116 5.766246286 5.077263745 2026-04-10T23:33:44.736 10396.502368 -1401.140347 -4614.930338 -2.936000883 5.770009852 5.089475986 End of SPK comments.