2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Aug 13 09:38:08 PDT 2018 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 72284 through 73388): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2018 APR 01 00:01:09.185 2018 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_od72254-72335_rec_v1.bsp spk_m_od72334-72423_rec_v1.bsp spk_m_od72422-72508_rec_v1.bsp spk_m_od72507-72590_rec_v1.bsp spk_m_od72587-72682_rec_v1.bsp spk_m_od72680-72759_rec_v1.bsp spk_m_od72758-72850_rec_v1.bsp spk_m_od72848-72923_rec_v1.bsp spk_m_od72921-73003_rec_v1.bsp spk_m_od73002-73100_rec_v1.bsp spk_m_od73098-73184_rec_v1.bsp spk_m_od73175-73274_rec_v1.bsp spk_m_od73272-73362_rec_v1.bsp spk_m_od73354-73431_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_ext55.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 72298 2018-04-02T05:18:50.814 0.004 0.000 0.001 72316 2018-04-03T17:15:50.814 -0.007 0.000 -0.002 72334 2018-04-05T03:06:50.814 0.011 -0.000 0.002 72353 2018-04-06T17:09:50.814 0.011 0.000 -0.004 72364 2018-04-07T16:14:50.814 -0.030 -0.000 -0.010 72376 2018-04-08T14:59:50.814 0.021 -0.000 -0.006 72399 2018-04-10T13:19:50.814 0.029 -0.000 0.011 72408 2018-04-11T06:21:50.814 -0.023 -0.000 0.005 72422 2018-04-12T09:55:50.814 -0.029 0.000 0.009 72438 2018-04-13T17:00:50.814 -0.017 -0.000 0.002 72448 2018-04-14T12:57:50.814 0.001 -0.000 -0.000 72456 2018-04-15T05:58:50.814 -0.022 -0.000 -0.009 72474 2018-04-16T16:30:50.814 0.031 -0.000 -0.012 72488 2018-04-17T19:53:50.814 -0.027 0.000 0.004 72499 2018-04-18T17:21:50.814 0.008 -0.000 0.002 72507 2018-04-19T09:44:50.814 0.009 -0.000 -0.003 72519 2018-04-20T08:55:50.814 0.014 -0.001 0.002 72542 2018-04-22T07:01:50.814 0.020 -0.000 -0.008 72554 2018-04-23T06:16:50.814 0.001 -0.000 -0.000 72566 2018-04-24T06:55:50.814 -0.011 -0.000 0.001 72578 2018-04-25T06:00:50.814 0.006 -0.000 -0.002 72587 2018-04-25T23:29:50.814 -0.003 -0.000 -0.000 72607 2018-04-27T16:35:50.814 0.001 0.000 0.001 72615 2018-04-28T06:55:50.814 -0.019 -0.000 0.001 72631 2018-04-29T16:02:50.814 0.000 -0.000 0.000 72652 2018-05-01T08:37:50.814 0.006 0.000 -0.002 72680 2018-05-03T16:13:50.814 0.011 -0.000 -0.002 72691 2018-05-04T14:40:50.814 0.023 0.000 0.009 72700 2018-05-05T08:36:50.814 -0.018 -0.000 -0.006 72722 2018-05-07T03:51:50.814 -0.016 -0.000 -0.006 72743 2018-05-08T21:35:50.814 0.000 0.000 0.000 72758 2018-05-10T02:03:50.814 0.009 0.000 -0.003 72775 2018-05-11T12:41:50.814 0.004 0.000 0.002 72784 2018-05-12T04:53:50.814 -0.007 -0.000 -0.001 72798 2018-05-13T10:04:50.814 -0.007 0.000 -0.002 72808 2018-05-14T04:25:50.814 0.003 0.000 0.000 72822 2018-05-15T08:13:50.814 0.014 0.000 -0.001 72832 2018-05-16T03:53:50.814 -0.022 -0.000 -0.001 72848 2018-05-17T12:43:50.814 -0.027 -0.000 -0.006 72861 2018-05-18T14:42:50.814 -0.040 -0.000 -0.016 72891 2018-05-21T00:27:50.814 0.000 0.000 0.000 72905 2018-05-22T05:52:50.814 -0.001 0.000 -0.000 72921 2018-05-23T12:27:50.814 0.022 -0.000 -0.009 72943 2018-05-25T07:52:50.814 0.004 -0.000 -0.001 72959 2018-05-26T15:42:50.814 0.028 -0.000 -0.009 72974 2018-05-27T22:02:50.814 0.009 -0.000 0.003 72990 2018-05-29T05:55:50.815 0.007 0.000 0.003 73002 2018-05-30T04:57:50.815 0.005 -0.000 -0.000 73021 2018-05-31T18:29:50.815 0.006 -0.000 -0.001 73042 2018-06-02T12:33:50.815 0.020 0.001 0.007 73059 2018-06-03T21:28:50.815 -0.055 0.001 0.016 73075 2018-06-05T05:58:50.815 -0.005 -0.000 -0.002 73091 2018-06-06T11:48:50.815 0.019 0.000 0.005 73098 2018-06-07T02:26:50.815 0.010 0.000 -0.004 73113 2018-06-08T07:17:50.815 -0.029 -0.000 -0.008 73125 2018-06-09T07:01:50.815 -0.006 -0.000 -0.002 73141 2018-06-10T15:59:50.815 0.019 -0.000 0.002 73159 2018-06-12T03:13:50.815 0.017 -0.000 -0.005 73175 2018-06-13T11:26:50.815 0.029 0.001 0.009 73202 2018-06-15T15:51:50.815 0.049 -0.000 -0.015 73211 2018-06-16T09:45:50.815 -0.026 0.000 0.009 73226 2018-06-17T15:03:50.815 -0.008 0.000 0.001 73246 2018-06-19T06:42:50.815 0.018 -0.000 -0.003 73262 2018-06-20T14:27:50.815 0.033 0.000 -0.009 73272 2018-06-21T09:41:50.815 -0.016 -0.000 -0.004 73289 2018-06-22T19:17:50.815 0.049 0.000 0.013 73306 2018-06-24T06:15:50.815 0.030 0.000 0.002 73330 2018-06-26T06:08:50.815 -0.028 -0.000 -0.009 73343 2018-06-27T06:06:50.815 -0.062 -0.001 -0.015 73354 2018-06-28T04:06:50.815 0.096 0.000 0.002 73380 2018-06-30T08:52:50.815 -0.049 0.000 -0.014