2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 1 06:43:02 PST 2022 Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the 2001 Mars Odyssey (M01) spacecraft. The NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Extended Phase of the M01 mission (orbits 87816 through 88932): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2021 OCT 01 00:01:09.182 2022 JAN 01 01:01:09.183 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the M01 NAV team during the Extended Phase of the mission. This file was created by NAIF for archiving in the Planetary Data System (PDS). Pedigree -------------------------------------------------------- The original SPK files used to create this file contained only reconstructed trajectory. They were officially delivered to the M01 project data base by the M01 NAV team. The list of the original files data from which has been merged into this file is provided in Appendix 1 of these comments. Segment Boundary Discontinuities -------------------------------------------------------- This SPK file contains a large number of SPK segments that came from original individual SPK files. Although, each segment provides continuous trajectory within the interval that it covers, in general a position and velocity discontinuity exists at the boundary of the segment and the segments whose coverages immediately precede or follow it. The times and magnitudes of these discontinuities are provided in Appendix 2 of these comments. Usage -------------------------------------------------------- This file should be used together with DE405 planetary ephemeris and MAR063 satellite ephemeris since the original SPK files contained subsets of these particular ephemeris in them. Contacts -------------------------------------------------------- If you have questions regarding this data contact Boris V. Semenov (818)-354-8136 Boris.Semenov@jpl.nasa.gov Appendix 1: Original SPK List -------------------------------------------------------- The original SPK files, the data from which has been included into this file, are: spk_m_od87854-87981_rec_v1.bsp spk_m_od87980-88063_rec_v1.bsp spk_m_od88062-88152_rec_v1.bsp spk_m_od88151-88236_rec_v1.bsp spk_m_od88233-88317_rec_v1.bsp spk_m_od88317-88397_rec_v1.bsp spk_m_od88395-88471_rec_v1.bsp spk_m_od88469-88577_rec_v1.bsp spk_m_od88576-88650_rec_v1.bsp spk_m_od88648-88736_rec_v1.bsp spk_m_od88736-88810_rec_v1.bsp spk_m_od88809-88889_rec_v1.bsp spk_m_od88888-88998_rec_v1.bsp Appendix 2: Segment Boundary Discontinuity Summary -------------------------------------------------------- This SPK file contains a large number of SPK segments that came from original individual SPK files. Although, each segment provides continuous trajectory within the interval that it covers, in general a position and velocity discontinuity exists at the boundary of the segment and the segments whose coverage immediately precede and follow it. The times and magnitudes of these discontinuities are provided in the table included in this Appendix. The top portion of the table contains the name of this SPK file. All descriptive lines in the top portion of the file start with the ``#'' character to allow direct plotting of the data in the freeware ``gnuplot'' application. The table consists of 5 columns. The first column is the orbit number within which a segment boundary with discontinuity occurs. The next column contains the UTC time of that segment boundary. The last three columns (3..5) contain view coordinate frame components -- ``down track'' (this direction is parallel to the velocity vector), ``normal to plane'' (this direction is computed as cross product of position vector by velocity vector) and ``in plane'' (this direction is computed as a cross product of ``down track'' by ``normal to plane'') -- of the difference between the state vectors computed at that UTC time defining segment boundary at which a discontinuity exists. The pairs of segments and discontinuity times are determined using an algorithm that emulates the standard SPK loading priority -- ``last loaded segment takes precedence''. Therefore, the discontinuities summarized in the file are those which a user reading file would actually see. The difference components in the view coordinate frame were computed for each discontinuity using the following algorithm: -- A single state was computed from each pair of segment the J2000 frame at the time of discontinuity. -- For this pair of states, a position difference vector was computed by subtracting the state computed from the segment with higher priority from the state computed from segment with lower priority. Then, a frame transformation matrix rotating these difference vectors from J2000 to the view coordinate frame defined by the state obtained from the higher priority segment was computed, and the position difference vector was rotated to the view frame coordinates using this matrix. The segment boundary discontinuities for this file are: # # Summary of discontinuities at segment boundaries for # SPK file ./m01_ext69.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 87824 2021-10-01T16:42:50.817 0.039 -0.000 -0.012 87839 2021-10-03T00:02:50.817 -0.029 -0.000 0.014 87850 2021-10-03T20:09:50.817 0.064 0.000 -0.014 87854 2021-10-04T04:21:50.817 -0.059 0.001 -0.014 87945 2021-10-11T16:51:50.817 -0.069 -0.001 -0.016 87957 2021-10-12T15:53:50.817 0.032 0.002 0.006 87980 2021-10-14T13:28:50.817 0.023 0.000 0.008 88004 2021-10-16T14:01:50.817 0.026 0.001 -0.011 88027 2021-10-18T10:10:50.817 -0.032 -0.000 -0.004 88048 2021-10-20T04:21:50.817 0.029 -0.000 0.007 88062 2021-10-21T07:43:50.817 -0.050 0.000 -0.021 88080 2021-10-22T20:00:50.817 -0.043 -0.000 0.010 88102 2021-10-24T15:46:50.817 0.015 0.000 -0.006 88113 2021-10-25T12:16:50.817 0.013 0.000 0.003 88140 2021-10-27T18:31:50.817 0.009 -0.000 -0.001 88151 2021-10-28T15:28:50.817 -0.019 0.000 -0.006 88168 2021-10-30T01:41:50.817 -0.047 0.000 -0.002 88184 2021-10-31T09:27:50.817 -0.007 -0.000 0.001 88190 2021-10-31T21:07:50.817 -0.002 0.000 -0.000 88201 2021-11-01T18:51:50.817 0.032 0.000 0.003 88213 2021-11-02T17:20:50.817 0.005 -0.000 -0.002 88233 2021-11-04T09:28:50.817 -0.019 0.000 -0.005 88247 2021-11-05T13:56:50.817 -0.020 0.000 0.002 88257 2021-11-06T08:51:50.817 0.054 -0.001 0.013 88269 2021-11-07T09:23:50.817 -0.037 0.001 0.003 88285 2021-11-08T16:21:50.817 0.047 -0.000 0.014 88294 2021-11-09T10:25:50.817 -0.015 0.000 -0.004 88317 2021-11-11T07:33:50.817 0.016 -0.001 0.005 88337 2021-11-12T22:51:50.817 -0.027 0.000 -0.004 88349 2021-11-13T23:38:50.817 -0.035 -0.001 0.006 88362 2021-11-14T23:50:50.817 0.033 -0.003 -0.007 88379 2021-11-16T10:26:50.817 0.014 0.002 0.003 88395 2021-11-17T17:54:50.817 0.029 -0.000 0.008 88411 2021-11-19T01:48:50.817 0.051 -0.000 0.006 88431 2021-11-20T17:44:50.817 -0.050 -0.000 0.010 88445 2021-11-21T20:19:50.817 0.037 -0.000 0.005 88456 2021-11-22T17:32:50.817 -0.090 -0.001 0.021 88469 2021-11-23T19:23:50.817 0.035 0.000 -0.005 88500 2021-11-26T09:23:50.817 -0.002 0.000 -0.001 88508 2021-11-27T00:23:50.817 -0.024 0.000 0.004 88524 2021-11-28T08:57:50.816 0.009 -0.001 0.002 88540 2021-11-29T16:22:50.816 -0.028 0.000 -0.006 88576 2021-12-02T14:42:50.816 0.041 0.000 -0.007 88589 2021-12-03T17:07:50.816 0.082 -0.001 0.015 88605 2021-12-05T01:44:50.816 0.010 -0.000 -0.002 88623 2021-12-06T13:07:50.816 -0.090 0.001 0.010 88648 2021-12-08T14:42:50.816 -0.054 0.000 0.009 88664 2021-12-09T20:41:50.816 0.035 0.001 -0.004 88677 2021-12-10T23:49:50.816 0.126 -0.000 -0.012 88688 2021-12-11T21:04:50.816 -0.113 0.001 -0.013 88707 2021-12-13T11:22:50.816 -0.292 -0.002 0.040 88723 2021-12-14T17:22:50.816 -0.003 0.000 0.000 88736 2021-12-15T19:07:50.816 0.105 0.001 -0.004 88755 2021-12-17T09:32:50.816 -0.097 0.002 -0.007 88765 2021-12-18T06:02:50.816 0.018 -0.000 -0.002 88787 2021-12-20T00:18:50.816 0.127 -0.001 0.011 88809 2021-12-21T19:52:50.816 -0.019 -0.001 -0.002 88822 2021-12-22T22:21:50.816 0.075 0.000 -0.004 88840 2021-12-24T09:33:50.816 0.026 -0.001 0.001 88876 2021-12-27T09:04:50.816 0.263 0.001 -0.011 88888 2021-12-28T07:16:50.816 -0.056 -0.001 0.003 88917 2021-12-30T17:28:50.816 0.227 -0.004 0.009 88930 2021-12-31T18:24:50.816 -0.024 0.002 0.000