2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu May 18 18:32:33 PDT 2017 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 66762 through 67853): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2017 JAN 01 00:01:09.183 2017 APR 01 01:01:09.185 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_od66725-66811_rec_v1.bsp spk_m_od66810-66900_rec_v1.bsp spk_m_od66899-66985_rec_v1.bsp spk_m_od66984-67069_rec_v1.bsp spk_m_od67069-67151_rec_v1.bsp spk_m_od67150-67239_rec_v1.bsp spk_m_od67239-67324_rec_v1.bsp spk_m_od67324-67406_rec_v1.bsp spk_m_od67405-67493_rec_v1.bsp spk_m_od67491-67572_rec_v1.bsp spk_m_od67570-67661_rec_v1.bsp spk_m_od67659-67750_rec_v1.bsp spk_m_od67749-67827_rec_v1.bsp spk_m_od67826-67920_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_ext50.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 66783 2017-01-02T20:06:50.816 0.000 -0.000 -0.000 66795 2017-01-03T19:51:05.815 0.002 -0.000 -0.002 66810 2017-01-05T00:55:42.815 -0.003 -0.000 -0.002 66826 2017-01-06T09:09:59.815 -0.003 -0.000 0.003 66843 2017-01-07T18:46:01.815 -0.007 0.000 0.008 66854 2017-01-08T16:32:11.815 0.004 -0.000 -0.005 66872 2017-01-10T04:06:50.815 -0.000 -0.000 0.000 66884 2017-01-11T03:50:50.815 -0.001 0.000 0.001 66899 2017-01-12T08:24:11.815 0.006 0.000 0.005 66914 2017-01-13T15:10:21.815 0.012 -0.000 -0.013 66930 2017-01-14T22:45:57.815 -0.007 0.000 0.007 66944 2017-01-16T02:29:14.815 0.003 -0.000 -0.003 66960 2017-01-17T10:07:50.815 -0.004 -0.000 0.004 66984 2017-01-19T08:29:50.815 0.004 -0.000 0.004 67002 2017-01-20T20:34:50.815 0.001 0.000 0.000 67020 2017-01-22T08:45:50.815 -0.001 0.000 0.001 67033 2017-01-23T10:28:02.815 -0.003 0.000 0.003 67054 2017-01-25T03:59:29.815 0.012 -0.000 -0.012 67069 2017-01-26T08:31:00.815 0.011 0.000 0.009 67090 2017-01-28T03:11:08.815 -0.002 -0.000 0.002 67103 2017-01-29T04:07:13.815 0.001 0.000 0.001 67115 2017-01-30T04:01:50.815 0.000 -0.000 -0.000 67135 2017-01-31T20:09:50.815 -0.001 0.000 0.001 67150 2017-02-02T00:43:50.815 0.004 0.000 0.004 67169 2017-02-03T14:28:50.815 0.002 -0.000 0.002 67188 2017-02-05T04:01:50.815 0.003 0.000 0.002 67208 2017-02-06T20:23:50.815 -0.005 0.000 0.004 67224 2017-02-08T04:03:59.815 -0.001 -0.000 0.001 67239 2017-02-09T08:40:50.815 0.011 -0.000 0.009 67263 2017-02-11T09:18:50.814 -0.002 0.000 0.001 67281 2017-02-12T20:58:50.814 0.010 -0.000 -0.008 67297 2017-02-14T04:32:59.814 -0.002 0.000 0.001 67317 2017-02-15T20:05:55.814 -0.009 0.000 0.007 67324 2017-02-16T08:41:52.814 0.002 0.000 0.001 67344 2017-02-18T01:29:06.814 -0.000 0.000 0.000 67356 2017-02-19T01:12:35.814 -0.004 -0.000 0.004 67368 2017-02-20T00:56:27.814 0.014 -0.000 -0.011 67384 2017-02-21T08:14:50.814 -0.001 0.000 0.000 67405 2017-02-23T01:26:50.814 -0.006 0.000 -0.002 67424 2017-02-24T15:40:50.814 -0.007 -0.000 0.006 67440 2017-02-25T23:20:50.814 0.009 0.000 -0.006 67454 2017-02-27T03:01:50.814 0.003 0.000 -0.003 67467 2017-02-28T04:30:24.814 -0.008 0.000 0.006 67479 2017-03-01T03:50:13.814 0.003 0.000 0.000 67491 2017-03-02T02:54:21.814 0.017 0.000 0.009 67508 2017-03-03T13:15:04.814 0.020 0.000 -0.001 67524 2017-03-04T21:27:56.814 -0.004 -0.000 0.003 67539 2017-03-06T03:09:28.814 0.004 0.000 -0.002 67554 2017-03-07T08:48:50.814 0.006 -0.000 -0.004 67570 2017-03-08T17:04:48.814 -0.003 -0.000 -0.002 67593 2017-03-10T13:25:45.814 0.007 -0.000 -0.001 67610 2017-03-11T23:35:10.814 0.001 0.000 -0.001 67624 2017-03-13T03:16:29.814 -0.014 0.000 0.008 67645 2017-03-14T20:22:50.814 0.018 -0.000 -0.007 67659 2017-03-15T23:42:50.814 -0.010 -0.000 -0.002 67677 2017-03-17T12:06:50.814 0.017 -0.000 -0.009 67696 2017-03-19T01:41:50.814 -0.005 0.000 0.002 67709 2017-03-20T03:24:50.814 0.007 -0.000 -0.003 67724 2017-03-21T08:24:25.814 0.002 -0.000 -0.000 67742 2017-03-22T20:01:46.814 -0.008 0.000 0.001 67749 2017-03-23T09:10:11.814 0.002 0.000 0.001 67766 2017-03-24T20:00:35.814 0.001 0.000 -0.001 67779 2017-03-25T21:57:57.814 -0.007 0.000 0.002 67795 2017-03-27T04:41:42.814 0.001 0.000 0.000 67811 2017-03-28T13:18:50.814 -0.011 -0.000 0.002 67826 2017-03-29T17:23:50.814 0.007 0.000 0.003 67844 2017-03-31T05:53:50.814 0.011 -0.000 -0.004