2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Oct 30 14:28:41 PDT 2020 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 82266 through 83382): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2020 JUL 01 00:01:09.184 2020 OCT 01 01:01:09.182 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_od82269-82371_rec_v1.bsp spk_m_od82369-82455_rec_v1.bsp spk_m_od82455-82541_rec_v1.bsp spk_m_od82539-82612_rec_v1.bsp spk_m_od82610-82699_rec_v1.bsp spk_m_od82697-82791_rec_v1.bsp spk_m_od82790-82877_rec_v1.bsp spk_m_od82875-82964_rec_v1.bsp spk_m_od82962-83045_rec_v1.bsp spk_m_od83043-83119_rec_v1.bsp spk_m_od83117-83223_rec_v1.bsp spk_m_od83221-83289_rec_v1.bsp spk_m_od83287-83389_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_ext64.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 82269 2020-07-01T07:33:50.815 0.013 0.000 -0.000 82284 2020-07-02T13:36:50.815 0.003 -0.000 -0.003 82296 2020-07-03T12:58:50.815 -0.021 -0.000 0.004 82309 2020-07-04T14:47:50.815 0.013 0.000 -0.007 82333 2020-07-06T14:30:50.816 0.006 -0.000 -0.005 82357 2020-07-08T13:58:50.816 -0.004 0.000 0.003 82369 2020-07-09T14:27:50.816 -0.004 0.000 -0.003 82380 2020-07-10T11:25:50.816 -0.003 0.000 0.003 82413 2020-07-13T04:38:50.816 0.003 0.000 -0.003 82425 2020-07-14T04:11:50.816 -0.001 -0.000 0.001 82439 2020-07-15T08:00:50.816 0.006 -0.000 -0.006 82455 2020-07-16T15:08:50.816 -0.003 -0.000 0.000 82481 2020-07-18T19:00:50.816 0.003 -0.000 -0.003 82491 2020-07-19T14:33:50.816 0.002 -0.000 -0.001 82504 2020-07-20T17:24:50.816 -0.004 -0.000 -0.003 82523 2020-07-22T05:53:50.816 -0.002 0.000 0.001 82539 2020-07-23T14:27:50.816 0.002 -0.000 0.001 82559 2020-07-25T04:39:50.816 0.005 0.000 -0.000 82576 2020-07-26T14:44:50.816 0.006 0.000 -0.005 82597 2020-07-28T09:28:50.816 -0.006 -0.000 -0.004 82610 2020-07-29T09:12:50.816 0.001 0.000 0.000 82634 2020-07-31T08:52:50.816 0.006 0.000 -0.001 82649 2020-08-01T14:24:50.816 0.004 0.000 0.001 82658 2020-08-02T08:37:50.816 -0.003 0.000 0.002 82677 2020-08-03T23:18:50.816 0.004 0.000 0.003 82697 2020-08-05T14:36:50.816 0.004 0.000 0.003 82710 2020-08-06T15:33:50.816 0.001 0.000 -0.001 82733 2020-08-08T13:00:50.816 0.006 0.000 -0.005 82744 2020-08-09T11:43:50.816 -0.006 0.000 -0.005 82759 2020-08-10T15:43:50.816 0.005 -0.000 0.001 82780 2020-08-12T09:53:50.817 0.010 -0.000 -0.008 82790 2020-08-13T06:23:50.817 -0.011 0.000 -0.008 82808 2020-08-14T16:39:50.817 0.005 0.000 0.000 82820 2020-08-15T16:56:50.817 0.004 -0.000 -0.003 82841 2020-08-17T10:27:50.817 -0.004 0.000 0.003 82852 2020-08-18T09:22:50.817 -0.003 0.000 -0.002 82868 2020-08-19T15:33:50.817 0.005 0.000 -0.003 82875 2020-08-20T06:20:50.817 -0.004 0.000 -0.003 82889 2020-08-21T09:12:50.817 -0.010 0.000 0.008 82903 2020-08-22T12:59:50.817 0.003 -0.000 -0.002 82914 2020-08-23T10:27:50.817 0.001 -0.000 -0.000 82925 2020-08-24T08:28:50.817 -0.006 0.000 0.004 82937 2020-08-25T07:58:50.817 0.006 -0.000 -0.004 82962 2020-08-27T10:15:50.817 -0.002 0.000 -0.001 82985 2020-08-29T07:04:50.817 -0.002 0.000 0.001 82998 2020-08-30T08:43:50.817 0.004 -0.000 -0.003 83014 2020-08-31T16:08:50.817 -0.005 -0.000 0.003 83025 2020-09-01T13:50:50.817 0.022 -0.000 -0.013 83043 2020-09-03T02:18:50.817 -0.003 -0.000 -0.001 83062 2020-09-04T15:00:50.817 -0.003 0.000 0.002 83072 2020-09-05T11:02:50.817 0.011 -0.000 -0.006 83082 2020-09-06T06:49:50.817 -0.008 -0.000 0.004 83094 2020-09-07T06:14:50.817 0.005 0.000 -0.002 83107 2020-09-08T08:14:50.817 -0.004 -0.000 0.002 83117 2020-09-09T04:36:50.817 0.036 0.000 0.018 83130 2020-09-10T05:41:50.817 0.019 -0.001 -0.009 83144 2020-09-11T09:00:50.817 -0.001 0.000 0.000 83159 2020-09-12T15:03:50.817 0.018 0.000 -0.007 83174 2020-09-13T20:39:50.817 0.012 0.000 -0.005 83190 2020-09-15T04:05:50.817 -0.003 0.000 0.002 83210 2020-09-16T20:44:50.817 -0.013 0.000 -0.007 83221 2020-09-17T18:35:50.817 -0.004 -0.000 -0.001 83240 2020-09-19T06:30:50.817 0.032 0.000 -0.004 83254 2020-09-20T10:55:50.817 -0.033 -0.000 0.008 83265 2020-09-21T08:06:50.817 -0.024 0.000 0.008 83278 2020-09-22T10:17:50.817 -0.000 -0.000 0.000 83287 2020-09-23T04:00:50.817 -0.048 0.001 0.019 83301 2020-09-24T07:51:50.817 0.000 0.000 0.000 83311 2020-09-25T04:12:50.817 -0.028 -0.001 -0.013 83339 2020-09-27T10:45:50.817 -0.048 -0.000 0.020 83365 2020-09-29T13:29:50.817 -0.037 -0.000 -0.002 83373 2020-09-30T06:06:50.817 0.036 0.000 -0.010