2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Nov 1 09:16:57 PDT 2019 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 77821 through 78937): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2019 JUL 01 00:01:09.184 2019 OCT 01 01:01:09.182 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_od77771-77850_rec_v1.bsp spk_m_od77848-77951_rec_v1.bsp spk_m_od77949-78020_rec_v1.bsp spk_m_od78018-78107_rec_v1.bsp spk_m_od78106-78202_rec_v1.bsp spk_m_od78201-78283_rec_v1.bsp spk_m_od78282-78360_rec_v1.bsp spk_m_od78359-78452_rec_v1.bsp spk_m_od78447-78542_rec_v1.bsp spk_m_od78540-78627_rec_v1.bsp spk_m_od78625-78715_rec_v1.bsp spk_m_od78714-78792_rec_v1.bsp spk_m_od78790-78881_rec_v1.bsp spk_m_od78880-78960_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_ext60.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 77836 2019-07-02T07:06:50.815 -0.018 -0.000 -0.002 77848 2019-07-03T08:03:50.815 0.018 0.000 -0.007 77871 2019-07-05T04:11:50.815 -0.003 0.000 -0.000 77887 2019-07-06T12:04:50.816 -0.002 -0.000 -0.001 77906 2019-07-08T02:52:50.816 -0.022 -0.000 0.010 77921 2019-07-09T06:56:50.816 0.014 0.000 -0.002 77933 2019-07-10T06:56:50.816 0.004 0.000 0.001 77949 2019-07-11T16:08:50.816 0.008 0.000 -0.002 77962 2019-07-12T16:36:50.816 -0.015 -0.000 -0.007 77973 2019-07-13T15:02:50.816 0.001 0.000 -0.000 77987 2019-07-14T17:25:50.816 0.000 -0.000 0.000 77999 2019-07-15T17:45:50.816 0.013 -0.000 0.006 78018 2019-07-17T08:08:50.816 -0.007 -0.000 0.003 78040 2019-07-19T03:40:50.816 0.009 0.000 -0.004 78056 2019-07-20T10:20:50.816 -0.002 0.000 -0.001 78076 2019-07-22T02:26:50.816 -0.015 0.000 0.001 78090 2019-07-23T06:11:50.816 0.001 -0.000 -0.000 78106 2019-07-24T14:14:50.816 -0.032 0.000 0.014 78130 2019-07-26T13:35:50.816 -0.007 0.000 0.004 78149 2019-07-28T02:26:50.816 -0.023 0.001 -0.007 78160 2019-07-29T00:57:50.816 -0.032 0.000 0.015 78185 2019-07-31T01:25:50.816 0.042 -0.001 0.019 78201 2019-08-01T08:36:50.816 -0.008 -0.000 -0.001 78222 2019-08-03T01:53:50.816 -0.015 0.000 0.002 78247 2019-08-05T03:17:50.816 0.015 0.000 -0.003 78260 2019-08-06T06:05:50.816 -0.007 0.000 0.000 78273 2019-08-07T06:34:50.816 0.021 0.000 -0.006 78282 2019-08-08T00:39:50.816 -0.002 -0.000 -0.000 78297 2019-08-09T06:30:50.816 0.005 -0.000 0.002 78321 2019-08-11T06:30:50.816 0.003 -0.000 0.000 78331 2019-08-12T01:43:50.816 0.008 0.000 0.004 78347 2019-08-13T09:46:50.817 0.019 -0.001 0.006 78359 2019-08-14T08:52:50.817 -0.041 -0.001 -0.006 78382 2019-08-16T06:30:50.817 -0.009 -0.000 -0.003 78396 2019-08-17T11:02:50.817 -0.042 0.000 0.009 78408 2019-08-18T11:04:50.817 0.035 0.000 -0.016 78430 2019-08-20T06:25:50.817 0.046 0.000 -0.019 78442 2019-08-21T05:20:50.817 -0.012 -0.000 -0.006 78447 2019-08-21T14:54:50.817 -0.007 -0.000 -0.002 78461 2019-08-22T19:28:50.817 -0.020 0.000 0.003 78473 2019-08-23T17:50:50.817 0.046 0.000 -0.016 78488 2019-08-25T00:20:50.817 -0.038 0.000 -0.017 78509 2019-08-26T17:30:50.817 0.023 -0.000 0.008 78527 2019-08-28T06:20:50.817 0.021 -0.000 -0.010 78540 2019-08-29T07:14:50.817 -0.026 0.000 -0.009 78558 2019-08-30T18:16:50.817 -0.007 0.000 -0.002 78625 2019-09-05T07:29:50.817 -0.005 0.000 0.000 78640 2019-09-06T12:30:50.817 -0.058 -0.001 -0.025 78650 2019-09-07T08:59:50.817 0.090 -0.000 -0.010 78664 2019-09-08T11:26:50.817 -0.010 -0.000 0.002 78692 2019-09-10T19:45:50.817 -0.032 0.000 -0.007 78714 2019-09-12T14:34:50.817 -0.025 -0.000 -0.005 78735 2019-09-14T08:16:50.817 -0.076 0.000 -0.031 78748 2019-09-15T10:32:50.817 0.023 -0.000 0.002 78772 2019-09-17T08:51:50.817 0.057 0.001 -0.016 78790 2019-09-18T21:29:50.817 0.077 -0.001 0.014 78808 2019-09-20T08:51:50.817 0.003 0.000 0.001 78820 2019-09-21T08:48:50.817 0.072 -0.000 0.010 78840 2019-09-23T00:11:50.817 0.054 -0.000 0.017 78863 2019-09-24T20:57:50.817 -0.013 -0.000 -0.001 78880 2019-09-26T07:04:50.817 -0.018 0.000 -0.008 78913 2019-09-29T01:00:50.817 -0.000 0.000 0.000 78924 2019-09-29T22:22:50.817 -0.029 0.000 -0.003