2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Aug 1 07:51:58 PDT 2024 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 98904 through 100009): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2024 APR 01 00:01:09.185 2024 JUL 01 01:01:09.184 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_od98862-98936_rec_v1.bsp spk_m_od98934-99016_rec_v1.bsp spk_m_od99016-99109_rec_v1.bsp spk_m_od99108-99202_rec_v1.bsp spk_m_od99201-99288_rec_v1.bsp spk_m_od99287-99360_rec_v1.bsp spk_m_od99359-99453_rec_v1.bsp spk_m_od99452-99541_rec_v1.bsp spk_m_od99540-99623_rec_v1.bsp spk_m_od99622-99700_rec_v1.bsp spk_m_od99699-99797_rec_v1.bsp spk_m_od99796-99882_rec_v1.bsp spk_m_od99881-99959_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_ext79.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 98918 2024-04-02T04:59:50.814 -0.026 0.000 0.011 98934 2024-04-03T13:29:50.814 0.012 0.000 0.006 98951 2024-04-04T22:00:50.814 -0.002 -0.000 0.001 98963 2024-04-05T21:53:50.814 0.001 -0.000 -0.000 98980 2024-04-07T07:28:50.814 0.038 -0.001 -0.018 98993 2024-04-08T08:16:50.814 -0.048 -0.001 -0.017 99016 2024-04-10T05:49:50.814 0.049 0.001 0.008 99029 2024-04-11T08:08:50.814 0.011 0.000 -0.007 99045 2024-04-12T15:32:50.814 0.009 -0.000 -0.005 99058 2024-04-13T17:01:50.814 0.033 -0.000 -0.009 99077 2024-04-15T07:05:50.814 0.017 -0.000 -0.010 99090 2024-04-16T08:46:50.814 -0.021 0.000 0.012 99108 2024-04-17T19:54:50.814 -0.025 -0.001 0.011 99129 2024-04-19T13:49:50.814 0.006 -0.000 -0.004 99142 2024-04-20T15:30:50.814 -0.001 0.000 0.000 99162 2024-04-22T06:54:50.814 0.007 0.000 -0.004 99178 2024-04-23T14:26:50.814 -0.002 -0.000 0.001 99191 2024-04-24T15:26:50.814 -0.003 0.000 -0.002 99201 2024-04-25T12:43:50.814 -0.016 -0.000 -0.009 99214 2024-04-26T14:42:50.814 -0.017 0.000 -0.011 99226 2024-04-27T14:26:50.814 0.009 0.000 0.007 99237 2024-04-28T11:11:50.814 0.009 -0.000 -0.006 99260 2024-04-30T08:00:50.814 -0.024 -0.000 -0.001 99273 2024-05-01T11:17:50.814 0.010 0.000 0.007 99287 2024-05-02T14:38:50.814 0.006 -0.000 0.004 99299 2024-05-03T13:17:50.814 -0.008 0.000 0.003 99311 2024-05-04T14:27:50.814 0.012 0.000 0.008 99324 2024-05-05T15:56:50.814 0.008 -0.000 0.005 99347 2024-05-07T12:30:50.814 -0.019 0.000 0.014 99359 2024-05-08T12:54:50.814 0.005 0.000 0.003 99381 2024-05-10T07:39:50.814 -0.002 0.000 0.001 99394 2024-05-11T09:22:50.814 -0.009 0.000 0.006 99405 2024-05-12T06:35:50.814 0.013 0.000 -0.002 99421 2024-05-13T14:26:50.814 -0.004 0.000 0.002 99444 2024-05-15T12:10:50.814 0.004 0.000 -0.003 99452 2024-05-16T04:40:50.814 0.014 -0.000 0.008 99466 2024-05-17T07:18:50.814 0.015 0.000 -0.008 99481 2024-05-18T13:11:50.814 0.002 -0.000 -0.001 99493 2024-05-19T12:50:50.814 -0.000 -0.000 0.000 99504 2024-05-20T10:42:50.814 -0.002 0.000 0.002 99518 2024-05-21T14:13:50.814 0.001 0.000 -0.001 99530 2024-05-22T14:05:50.814 0.001 -0.000 -0.001 99540 2024-05-23T10:34:50.814 0.014 0.001 0.009 99555 2024-05-24T15:28:50.814 -0.006 0.000 0.005 99577 2024-05-26T10:57:50.814 0.018 -0.000 -0.014 99591 2024-05-27T14:22:50.814 -0.001 -0.000 0.000 99611 2024-05-29T05:58:50.815 -0.005 -0.000 0.004 99622 2024-05-30T04:35:50.815 -0.012 -0.000 -0.007 99640 2024-05-31T15:22:50.815 -0.001 -0.000 0.000 99662 2024-06-02T10:53:50.815 0.002 -0.000 -0.002 99682 2024-06-04T02:24:50.815 -0.015 -0.000 0.013 99699 2024-06-05T12:44:50.815 0.001 0.000 0.000 99722 2024-06-07T09:17:50.815 0.001 0.000 -0.001 99738 2024-06-08T16:24:50.815 -0.007 -0.000 -0.002 99749 2024-06-09T14:24:50.815 0.003 -0.000 -0.001 99761 2024-06-10T14:29:50.815 -0.006 0.000 0.005 99772 2024-06-11T12:14:50.815 -0.001 -0.000 0.000 99796 2024-06-13T12:25:50.815 0.006 -0.000 0.005 99820 2024-06-15T11:05:50.815 0.007 0.000 -0.006 99843 2024-06-17T08:32:50.815 0.000 0.000 -0.000 99854 2024-06-18T06:14:50.815 -0.006 0.000 0.005 99866 2024-06-19T05:21:50.815 0.007 0.000 0.002 99881 2024-06-20T12:31:50.815 0.001 0.000 0.000 99894 2024-06-21T14:19:50.815 0.007 -0.000 0.006 99905 2024-06-22T10:29:50.815 -0.005 -0.000 -0.000 99917 2024-06-23T10:24:50.815 -0.005 -0.000 0.002 99931 2024-06-24T14:22:50.815 0.003 0.000 -0.002 99948 2024-06-25T23:59:50.815 -0.003 -0.000 0.003 99958 2024-06-26T20:31:50.815 0.004 -0.000 0.003 99979 2024-06-28T13:06:50.815 0.002 0.000 -0.002 99989 2024-06-29T08:53:50.815 0.005 -0.000 -0.004 100005 2024-06-30T16:24:50.815 0.002 -0.000 -0.001