2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Apr 19 07:28:42 PDT 2022 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 88933 through 90025): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2022 JAN 01 00:01:09.183 2022 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_od88888-88998_rec_v1.bsp spk_m_od88997-89083_rec_v1.bsp spk_m_od89082-89171_rec_v1.bsp spk_m_od89170-89247_rec_v1.bsp spk_m_od89246-89326_rec_v1.bsp spk_m_od89325-89414_rec_v1.bsp spk_m_od89413-89508_rec_v1.bsp spk_m_od89508-89586_rec_v1.bsp spk_m_od89585-89678_rec_v1.bsp spk_m_od89676-89769_rec_v1.bsp spk_m_od89767-89848_rec_v1.bsp spk_m_od89846-89932_rec_v1.bsp spk_m_od89930-90019_rec_v1.bsp spk_m_od90017-90103_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_ext70.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 88945 2022-01-02T01:03:50.816 -0.341 0.004 -0.003 88960 2022-01-03T05:53:50.816 0.174 -0.001 0.001 88977 2022-01-04T15:40:50.815 0.024 -0.003 0.000 88997 2022-01-06T07:16:50.815 -0.210 -0.002 -0.002 89013 2022-01-07T16:08:50.815 -1.011 0.010 -0.004 89041 2022-01-09T22:38:50.815 0.294 -0.002 -0.006 89063 2022-01-11T17:38:50.815 0.129 0.001 -0.001 89082 2022-01-13T07:36:50.815 -0.335 0.002 0.013 89101 2022-01-14T20:47:50.815 -0.100 0.001 0.003 89120 2022-01-16T09:47:50.815 -0.129 -0.000 -0.007 89138 2022-01-17T22:42:50.815 -0.407 0.002 -0.001 89159 2022-01-19T16:24:50.815 -0.157 -0.000 -0.007 89170 2022-01-20T14:15:50.815 0.161 0.001 0.011 89186 2022-01-21T21:05:50.815 0.044 -0.001 -0.004 89202 2022-01-23T05:39:50.815 0.196 0.002 0.019 89218 2022-01-24T11:42:50.815 -0.078 -0.000 -0.002 89234 2022-01-25T20:26:50.815 0.008 -0.001 0.000 89246 2022-01-26T18:45:50.815 -0.071 -0.001 -0.008 89259 2022-01-27T20:32:50.815 0.023 0.000 0.002 89272 2022-01-28T22:07:50.815 -0.083 -0.000 -0.010 89289 2022-01-30T09:22:50.815 -0.151 -0.001 -0.017 89301 2022-01-31T08:42:50.815 0.039 -0.001 -0.002 89315 2022-02-01T11:59:50.815 0.033 -0.000 -0.005 89325 2022-02-02T06:55:50.815 0.014 -0.000 0.002 89363 2022-02-05T10:11:50.815 -0.033 -0.001 -0.002 89382 2022-02-06T23:36:50.815 0.107 0.002 0.015 89394 2022-02-08T00:46:50.815 -0.135 0.000 -0.015 89413 2022-02-09T13:59:50.815 -0.203 0.002 0.015 89428 2022-02-10T20:00:50.814 -0.144 0.000 -0.021 89445 2022-02-12T04:30:50.814 0.025 0.000 -0.002 89460 2022-02-13T11:35:50.814 0.060 0.000 0.013 89475 2022-02-14T15:46:50.814 -0.003 0.000 0.000 89489 2022-02-15T19:56:50.814 0.066 -0.001 -0.014 89508 2022-02-17T09:04:50.814 -0.029 0.001 0.005 89521 2022-02-18T11:30:50.814 -0.015 0.000 0.000 89548 2022-02-20T17:11:50.814 -0.017 0.000 -0.004 89560 2022-02-21T16:32:50.814 0.139 -0.000 -0.008 89575 2022-02-22T21:48:50.814 -0.024 0.000 0.007 89585 2022-02-23T17:59:50.814 -0.109 0.001 0.002 89605 2022-02-25T08:20:50.814 -0.009 -0.000 -0.002 89621 2022-02-26T16:01:50.814 -0.027 0.000 -0.003 89631 2022-02-27T11:56:50.814 0.038 0.000 -0.001 89642 2022-02-28T10:00:50.814 0.048 -0.000 -0.013 89666 2022-03-02T09:55:50.814 0.036 -0.000 -0.005 89676 2022-03-03T06:23:50.814 0.027 -0.000 0.009 89690 2022-03-04T08:37:50.814 0.011 -0.000 -0.001 89703 2022-03-05T10:36:50.814 0.040 -0.001 -0.014 89715 2022-03-06T10:12:50.814 -0.004 -0.000 0.001 89728 2022-03-07T12:47:50.814 0.031 -0.000 0.007 89739 2022-03-08T09:33:50.814 0.033 -0.000 -0.008 89750 2022-03-09T07:38:50.814 -0.018 0.001 0.007 89767 2022-03-10T17:53:50.814 0.028 -0.000 0.007 89789 2022-03-12T12:18:50.814 0.018 0.000 -0.003 89801 2022-03-13T12:53:50.814 0.055 -0.000 0.003 89826 2022-03-15T14:22:50.814 -0.037 0.000 -0.006 89836 2022-03-16T09:08:50.814 0.035 -0.000 -0.005 89846 2022-03-17T06:02:50.814 0.030 -0.000 0.010 89862 2022-03-18T12:53:50.814 -0.009 0.000 0.004 89873 2022-03-19T10:54:50.814 -0.019 0.000 0.005 89886 2022-03-20T12:43:50.814 0.013 -0.000 -0.002 89897 2022-03-21T10:22:50.814 -0.012 0.000 0.003 89921 2022-03-23T08:54:50.814 0.024 0.000 0.003 89930 2022-03-24T03:12:50.814 -0.015 -0.000 0.007 89941 2022-03-25T01:04:50.814 0.006 -0.000 -0.003 89964 2022-03-26T21:52:50.814 -0.040 -0.000 -0.005 89975 2022-03-27T20:39:50.814 0.001 -0.000 -0.000 90006 2022-03-30T09:27:50.814 -0.027 0.000 0.014 90017 2022-03-31T07:48:50.814 0.040 -0.001 0.008