2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Aug 16 08:06:51 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 67854 through 68958): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2017 APR 01 00:01:09.185 2017 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_od67826-67920_rec_v1.bsp spk_m_od67915-68005_rec_v1.bsp spk_m_od68003-68088_rec_v1.bsp spk_m_od68084-68172_rec_v1.bsp spk_m_od68169-68257_rec_v1.bsp spk_m_od68254-68344_rec_v1.bsp spk_m_od68343-68421_rec_v1.bsp spk_m_od68420-68512_rec_v1.bsp spk_m_od68510-68599_rec_v1.bsp spk_m_od68597-68687_rec_v1.bsp spk_m_od68678-68768_rec_v1.bsp spk_m_od68767-68854_rec_v1.bsp spk_m_od68853-68942_rec_v1.bsp spk_m_od68941-69023_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_ext51.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 67864 2017-04-01T21:24:50.814 -0.008 0.000 0.003 67879 2017-04-03T03:28:50.814 0.031 -0.000 -0.015 67891 2017-04-04T03:35:20.814 -0.001 -0.000 -0.000 67903 2017-04-05T03:30:20.814 -0.011 0.000 -0.002 67915 2017-04-06T01:39:54.814 -0.013 -0.000 -0.006 67933 2017-04-07T14:07:16.814 0.002 0.000 -0.001 67951 2017-04-09T01:59:31.814 -0.012 -0.000 0.004 67962 2017-04-09T22:49:53.814 0.021 0.000 0.006 67973 2017-04-10T20:07:57.814 -0.007 -0.000 -0.003 67988 2017-04-12T03:28:15.814 -0.007 0.000 -0.000 68003 2017-04-13T08:38:50.814 0.007 -0.000 -0.003 68018 2017-04-14T14:08:50.814 -0.005 0.000 0.002 68033 2017-04-15T19:08:50.814 -0.010 0.000 -0.004 68049 2017-04-17T03:23:50.814 0.004 -0.000 -0.001 68069 2017-04-18T17:58:50.814 -0.006 -0.000 -0.002 68084 2017-04-20T01:28:50.814 -0.008 0.000 -0.002 68102 2017-04-21T12:12:50.814 -0.003 -0.000 0.001 68114 2017-04-22T12:13:50.814 0.018 -0.001 -0.006 68129 2017-04-23T18:08:50.814 -0.012 0.000 0.002 68142 2017-04-24T18:46:50.814 0.003 -0.000 0.001 68158 2017-04-26T03:18:50.814 -0.011 -0.000 0.004 68169 2017-04-27T01:15:50.814 0.015 -0.000 -0.002 68189 2017-04-28T16:18:50.814 -0.016 0.000 0.005 68205 2017-04-29T23:18:50.814 0.009 0.000 0.002 68217 2017-04-30T23:58:50.814 -0.002 -0.000 0.001 68231 2017-05-02T03:36:37.814 -0.008 -0.000 0.003 68243 2017-05-03T03:33:56.814 0.007 -0.000 -0.001 68254 2017-05-04T00:33:56.814 -0.011 0.000 0.001 68276 2017-05-05T19:53:45.814 -0.001 -0.000 -0.000 68287 2017-05-06T18:34:02.814 0.025 0.000 -0.005 68304 2017-05-08T03:13:12.814 0.003 0.000 0.000 68316 2017-05-09T03:21:50.814 -0.015 0.000 0.003 68332 2017-05-10T10:18:50.814 0.004 -0.000 0.001 68343 2017-05-11T07:58:50.814 -0.003 0.000 -0.001 68361 2017-05-12T19:58:50.814 -0.022 0.000 -0.003 68373 2017-05-13T19:48:50.814 0.003 -0.000 0.000 68389 2017-05-15T03:03:50.814 0.017 0.000 0.005 68403 2017-05-16T06:50:04.814 0.013 -0.000 0.003 68420 2017-05-17T17:02:49.814 -0.009 -0.000 0.001 68438 2017-05-19T04:54:32.814 -0.005 0.000 0.001 68458 2017-05-20T19:45:28.814 -0.015 0.000 -0.002 68474 2017-05-22T02:58:50.814 -0.015 -0.000 -0.003 68498 2017-05-24T02:38:50.814 0.018 0.000 0.004 68510 2017-05-25T03:33:50.814 -0.012 0.000 0.002 68526 2017-05-26T10:38:50.814 0.009 -0.000 -0.001 68543 2017-05-27T19:28:50.815 -0.010 -0.000 -0.002 68559 2017-05-29T02:58:50.815 -0.005 -0.000 -0.001 68579 2017-05-30T19:31:14.815 0.001 -0.001 0.000 68597 2017-06-01T07:29:50.815 0.023 -0.000 -0.005 68615 2017-06-02T19:08:50.815 0.010 -0.000 -0.002 68630 2017-06-04T00:23:50.815 -0.028 0.000 0.003 68643 2017-06-05T02:48:50.815 0.037 0.001 -0.003 68656 2017-06-06T02:45:47.815 0.008 0.001 0.001 68669 2017-06-07T04:33:41.815 -0.016 -0.000 -0.002 68678 2017-06-07T23:49:50.815 0.019 -0.000 -0.004 68697 2017-06-09T12:08:50.815 0.042 -0.000 0.009 68710 2017-06-10T13:33:50.815 0.001 -0.000 0.000 68726 2017-06-11T22:38:50.815 -0.020 -0.000 0.004 68742 2017-06-13T06:15:50.815 0.003 -0.000 -0.001 68756 2017-06-14T09:04:50.815 0.024 -0.000 0.005 68767 2017-06-15T07:14:37.815 -0.017 -0.000 0.000 68785 2017-06-16T19:18:15.815 0.005 0.000 -0.001 68796 2017-06-17T16:51:42.815 -0.024 -0.000 0.004 68809 2017-06-18T19:08:14.815 -0.002 -0.001 -0.000 68825 2017-06-20T00:54:50.815 0.010 0.000 -0.000 68839 2017-06-21T06:08:50.815 -0.026 0.001 0.005 68853 2017-06-22T08:54:07.815 0.045 -0.000 0.009 68874 2017-06-24T02:26:32.815 0.027 -0.000 0.005 68886 2017-06-25T03:17:14.815 -0.022 -0.001 0.004 68898 2017-06-26T02:20:59.815 0.016 -0.000 -0.000 68919 2017-06-27T18:58:50.815 0.067 0.000 0.004 68930 2017-06-28T18:03:50.815 -0.024 -0.000 0.005 68941 2017-06-29T14:48:50.815 -0.030 0.000 -0.006