2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu May 7 12:46:01 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 80055 through 81160): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2020 JAN 01 00:01:09.183 2020 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_od80000-80077_rec_v1.bsp spk_m_od80076-80155_rec_v1.bsp spk_m_od80155-80244_rec_v1.bsp spk_m_od80243-80325_rec_v1.bsp spk_m_od80325-80417_rec_v1.bsp spk_m_od80415-80490_rec_v1.bsp spk_m_od80488-80569_rec_v1.bsp spk_m_od80567-80669_rec_v1.bsp spk_m_od80668-80757_rec_v1.bsp spk_m_od80755-80836_rec_v1.bsp spk_m_od80834-80910_rec_v1.bsp spk_m_od80907-81005_rec_v1.bsp spk_m_od81004-81091_rec_v1.bsp spk_m_od81089-81179_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_ext62.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 80065 2020-01-01T20:26:50.816 -0.024 -0.000 0.002 80076 2020-01-02T18:11:50.816 -0.005 -0.000 0.000 80089 2020-01-03T20:26:50.816 -0.008 0.000 -0.001 80108 2020-01-05T09:16:50.815 0.010 0.000 -0.002 80125 2020-01-06T20:26:50.815 -0.040 -0.001 0.004 80143 2020-01-08T07:26:50.815 0.047 0.000 0.007 80155 2020-01-09T05:59:50.815 -0.059 -0.001 0.009 80172 2020-01-10T16:51:50.815 0.045 0.000 0.006 80187 2020-01-11T21:01:50.815 -0.044 -0.000 0.004 80198 2020-01-12T20:31:50.815 0.024 0.001 0.000 80210 2020-01-13T19:57:50.815 0.001 0.000 0.000 80228 2020-01-15T07:31:50.815 0.042 -0.000 0.006 80243 2020-01-16T13:04:50.815 -0.048 -0.000 -0.007 80258 2020-01-17T17:50:50.815 0.005 0.000 -0.001 80268 2020-01-18T13:55:50.815 0.017 0.000 -0.000 80303 2020-01-21T10:37:50.815 -0.038 -0.000 0.006 80325 2020-01-23T05:53:50.815 0.009 0.000 -0.001 80351 2020-01-25T09:17:50.815 -0.032 -0.000 0.003 80380 2020-01-27T19:52:50.815 -0.012 -0.000 -0.002 80393 2020-01-28T20:28:50.815 0.022 0.001 -0.003 80405 2020-01-29T20:07:50.815 0.015 0.000 -0.002 80415 2020-01-30T17:13:50.815 0.023 -0.000 0.003 80429 2020-01-31T19:58:50.815 -0.008 0.000 0.001 80443 2020-02-02T00:18:50.815 0.013 0.000 0.002 80454 2020-02-02T21:13:50.815 -0.016 0.000 0.003 80476 2020-02-04T17:41:50.815 0.027 -0.000 0.005 80488 2020-02-05T17:03:50.815 -0.010 0.000 -0.001 80502 2020-02-06T20:27:50.815 -0.024 0.000 0.001 80520 2020-02-08T08:04:50.815 0.007 0.000 -0.000 80548 2020-02-10T15:32:50.814 -0.004 -0.000 -0.000 80567 2020-02-12T05:37:50.814 -0.043 -0.000 -0.008 80593 2020-02-14T07:42:50.814 -0.014 0.000 0.002 80609 2020-02-15T16:39:50.814 -0.039 -0.000 -0.008 80629 2020-02-17T06:56:50.814 0.015 -0.000 -0.003 80645 2020-02-18T14:58:50.814 0.007 -0.000 -0.001 80657 2020-02-19T15:19:50.814 0.004 -0.000 0.001 80668 2020-02-20T12:37:50.814 -0.002 0.000 0.000 80681 2020-02-21T14:28:50.814 0.019 -0.000 0.002 80703 2020-02-23T09:23:50.814 -0.009 0.000 0.002 80714 2020-02-24T08:18:50.814 -0.036 0.000 -0.007 80730 2020-02-25T15:28:50.814 -0.010 0.000 -0.002 80744 2020-02-26T18:43:50.814 -0.012 0.000 0.002 80755 2020-02-27T16:41:50.814 0.003 0.000 0.000 80769 2020-02-28T19:53:50.814 -0.023 0.000 0.006 80790 2020-03-01T13:58:50.814 0.037 -0.001 0.005 80806 2020-03-02T20:23:50.814 0.016 0.000 0.001 80817 2020-03-03T18:55:50.814 -0.028 0.001 0.006 80834 2020-03-05T05:11:50.814 -0.001 0.000 -0.000 80867 2020-03-07T21:07:50.814 0.022 0.000 -0.003 80884 2020-03-09T06:59:50.814 -0.007 0.000 0.002 80907 2020-03-11T05:05:50.814 0.038 -0.000 0.002 80933 2020-03-13T07:47:50.814 0.046 -0.000 -0.015 80944 2020-03-14T06:52:50.814 0.008 -0.000 0.002 80969 2020-03-16T07:01:50.814 0.008 0.000 -0.003 80981 2020-03-17T07:27:50.814 -0.001 -0.000 -0.000 80994 2020-03-18T08:27:50.814 0.008 -0.000 -0.003 81004 2020-03-19T04:55:50.814 0.003 -0.000 0.001 81017 2020-03-20T06:46:50.814 0.016 0.000 0.006 81030 2020-03-21T07:24:50.814 -0.021 -0.000 0.006 81054 2020-03-23T07:00:50.814 0.002 -0.000 -0.001 81070 2020-03-24T14:31:50.814 0.030 -0.000 -0.011 81089 2020-03-26T04:39:50.814 -0.015 0.000 0.001 81102 2020-03-27T07:00:50.814 -0.048 -0.000 -0.019 81115 2020-03-28T06:57:50.814 0.022 0.000 0.005 81128 2020-03-29T08:59:50.814 0.030 -0.000 -0.007 81143 2020-03-30T14:16:50.814 0.025 0.000 0.006 81155 2020-03-31T14:02:50.814 -0.004 0.000 -0.001