2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue May 14 11:03:57 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 75623 through 76715): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2019 JAN 01 00:01:09.183 2019 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_od75564-75645_rec_v1.bsp spk_m_od75644-75737_rec_v1.bsp spk_m_od75737-75812_rec_v1.bsp spk_m_od75812-75906_rec_v1.bsp spk_m_od75901-75987_rec_v1.bsp spk_m_od75987-76070_rec_v1.bsp spk_m_od76070-76161_rec_v1.bsp spk_m_od76160-76244_rec_v1.bsp spk_m_od76242-76331_rec_v1.bsp spk_m_od76329-76414_rec_v1.bsp spk_m_od76413-76497_rec_v1.bsp spk_m_od76495-76580_rec_v1.bsp spk_m_od76578-76656_rec_v1.bsp spk_m_od76656-76740_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_ext58.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 75628 2019-01-01T12:08:50.816 -0.005 0.000 0.006 75644 2019-01-02T18:57:50.816 0.004 -0.000 0.005 75669 2019-01-04T21:12:50.815 0.009 -0.000 -0.011 75685 2019-01-06T04:13:50.815 -0.004 0.000 -0.002 75694 2019-01-06T22:18:50.815 0.001 -0.000 -0.001 75710 2019-01-08T05:34:50.815 -0.001 0.000 -0.001 75725 2019-01-09T11:15:50.815 -0.003 0.000 -0.002 75737 2019-01-10T10:30:50.815 0.004 0.000 0.004 75755 2019-01-11T22:21:50.815 0.001 0.000 0.001 75773 2019-01-13T10:45:50.815 -0.005 0.000 0.006 75785 2019-01-14T09:52:50.815 0.005 0.000 0.002 75797 2019-01-15T10:11:50.815 0.005 0.000 -0.006 75812 2019-01-16T14:44:50.815 -0.009 -0.000 -0.009 75827 2019-01-17T21:29:50.815 -0.003 0.000 0.003 75840 2019-01-18T22:16:50.815 0.000 0.000 0.000 75855 2019-01-20T04:13:50.815 -0.005 -0.000 -0.002 75868 2019-01-21T05:47:50.815 0.000 -0.000 0.000 75880 2019-01-22T05:38:50.815 0.005 -0.000 0.002 75895 2019-01-23T11:17:50.815 -0.003 0.000 -0.001 75901 2019-01-23T22:38:50.815 0.006 -0.000 0.006 75918 2019-01-25T08:38:50.815 0.002 -0.000 0.001 75938 2019-01-27T00:50:50.815 -0.003 0.000 0.003 75951 2019-01-28T02:11:50.815 -0.002 -0.000 0.001 75965 2019-01-29T05:41:50.815 -0.001 -0.000 -0.000 75987 2019-01-31T00:49:50.815 0.009 -0.000 0.009 75999 2019-02-01T01:23:50.815 0.007 -0.000 -0.007 76013 2019-02-02T05:09:50.815 -0.001 -0.000 0.001 76028 2019-02-03T10:47:50.815 -0.002 -0.000 0.002 76040 2019-02-04T10:31:50.815 0.001 -0.000 -0.001 76062 2019-02-06T05:15:50.815 0.002 0.000 0.001 76070 2019-02-06T20:39:50.815 -0.004 0.000 -0.003 76082 2019-02-07T21:32:50.815 -0.005 0.000 0.004 76101 2019-02-09T10:34:50.815 0.001 -0.000 -0.000 76113 2019-02-10T10:34:50.814 0.001 0.000 -0.001 76131 2019-02-11T22:00:50.814 -0.005 0.000 0.002 76148 2019-02-13T07:55:50.814 0.015 -0.000 -0.012 76160 2019-02-14T06:32:50.814 0.011 0.000 0.008 76175 2019-02-15T12:36:50.814 0.003 0.000 0.001 76186 2019-02-16T10:19:50.814 -0.006 -0.000 -0.003 76210 2019-02-18T10:19:50.814 0.002 -0.000 -0.001 76230 2019-02-20T01:17:50.814 -0.002 -0.000 -0.001 76242 2019-02-21T01:21:50.814 -0.009 0.000 0.002 76256 2019-02-22T05:10:50.814 -0.000 0.000 -0.000 76270 2019-02-23T09:09:50.814 -0.006 -0.000 0.005 76283 2019-02-24T09:58:50.814 0.002 0.000 0.001 76300 2019-02-25T19:37:50.814 -0.001 -0.000 -0.001 76319 2019-02-27T10:01:50.814 0.006 -0.000 -0.005 76329 2019-02-28T04:32:50.814 -0.000 -0.001 0.000 76343 2019-03-01T09:27:50.814 -0.005 0.000 0.004 76355 2019-03-02T09:10:50.814 0.003 0.000 -0.002 76377 2019-03-04T04:40:50.814 -0.003 -0.000 0.002 76401 2019-03-06T03:57:50.814 0.001 -0.000 -0.001 76413 2019-03-07T03:28:50.814 0.008 0.000 -0.004 76425 2019-03-08T02:50:50.814 0.005 -0.000 0.001 76440 2019-03-09T09:12:50.814 0.015 -0.000 -0.010 76451 2019-03-10T06:56:50.814 -0.007 0.000 0.004 76473 2019-03-12T02:27:50.814 -0.003 -0.000 0.002 76495 2019-03-13T20:57:50.814 0.002 0.000 0.002 76511 2019-03-15T05:02:50.814 -0.001 0.000 0.000 76523 2019-03-16T05:03:50.814 0.012 0.000 -0.007 76536 2019-03-17T05:49:50.814 -0.012 0.000 -0.008 76558 2019-03-19T02:20:50.814 0.004 0.000 -0.003 76578 2019-03-20T17:38:50.814 -0.003 0.000 0.002 76596 2019-03-22T04:58:50.814 -0.007 -0.000 0.001 76610 2019-03-23T09:06:50.814 -0.003 0.000 0.002 76622 2019-03-24T08:58:50.814 0.013 -0.000 -0.008 76638 2019-03-25T15:35:50.814 0.005 -0.000 0.002 76656 2019-03-27T02:48:50.814 -0.012 0.000 -0.005 76673 2019-03-28T13:21:50.814 -0.012 0.000 0.005 76693 2019-03-30T04:52:50.814 -0.003 0.000 0.001 76705 2019-03-31T04:51:50.814 0.006 -0.000 -0.004