2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Sat May 4 05:46:03 PDT 2024 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 97799 through 98903): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2024 JAN 01 00:01:09.183 2024 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_od97747-97840_rec_v1.bsp spk_m_od97839-97915_rec_v1.bsp spk_m_od97913-98012_rec_v1.bsp spk_m_od98009-98097_rec_v1.bsp spk_m_od98094-98178_rec_v1.bsp spk_m_od98177-98257_rec_v1.bsp spk_m_od98256-98352_rec_v1.bsp spk_m_od98351-98435_rec_v1.bsp spk_m_od98434-98521_rec_v1.bsp spk_m_od98518-98606_rec_v1.bsp spk_m_od98605-98685_rec_v1.bsp spk_m_od98684-98780_rec_v1.bsp spk_m_od98779-98863_rec_v1.bsp spk_m_od98862-98936_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_ext78.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 97815 2024-01-02T10:08:50.816 -0.050 -0.001 -0.002 97827 2024-01-03T09:39:50.816 0.038 -0.000 -0.002 97839 2024-01-04T08:32:50.815 0.006 0.000 -0.000 97853 2024-01-05T12:04:50.815 -0.019 0.000 -0.000 97877 2024-01-07T12:04:50.815 0.052 0.000 -0.009 97892 2024-01-08T17:48:50.815 -0.037 0.000 0.005 97913 2024-01-10T11:02:50.815 0.036 0.000 -0.006 97937 2024-01-12T09:37:50.815 0.085 0.001 0.015 97949 2024-01-13T10:28:50.815 -0.101 -0.000 0.014 97962 2024-01-14T10:58:50.815 0.045 -0.000 0.008 97978 2024-01-15T18:39:50.815 0.020 0.000 0.004 98009 2024-01-18T08:31:50.815 -0.030 0.000 0.004 98023 2024-01-19T11:18:50.815 -0.038 -0.001 -0.007 98038 2024-01-20T18:04:50.815 -0.066 0.000 0.014 98047 2024-01-21T12:03:50.815 -0.011 0.000 0.002 98065 2024-01-22T23:13:50.815 -0.041 0.001 0.008 98076 2024-01-23T21:13:50.815 -0.008 0.000 0.002 98094 2024-01-25T08:21:50.815 -0.057 0.001 0.007 98107 2024-01-26T10:29:50.815 0.163 -0.001 -0.035 98119 2024-01-27T10:28:50.815 -0.142 0.000 0.009 98131 2024-01-28T10:26:50.815 -0.098 -0.001 -0.012 98159 2024-01-30T16:24:50.815 0.007 0.000 0.001 98177 2024-02-01T03:51:50.815 -0.041 -0.000 -0.009 98192 2024-02-02T10:21:50.815 -0.036 0.000 0.009 98207 2024-02-03T16:30:50.815 0.046 -0.000 0.003 98228 2024-02-05T09:50:50.815 0.054 -0.001 -0.003 98240 2024-02-06T09:32:50.815 0.011 -0.000 -0.001 98248 2024-02-07T00:33:50.815 0.008 -0.000 -0.001 98256 2024-02-07T16:11:50.815 0.048 0.000 0.002 98277 2024-02-09T10:28:50.815 -0.039 0.001 0.008 98294 2024-02-10T20:25:50.814 -0.060 0.000 -0.006 98315 2024-02-12T12:27:50.814 -0.038 -0.000 -0.011 98326 2024-02-13T10:14:50.814 -0.024 -0.000 -0.006 98338 2024-02-14T09:54:50.814 0.013 -0.000 0.004 98351 2024-02-15T12:16:50.814 0.006 -0.000 -0.002 98365 2024-02-16T16:04:50.814 -0.064 0.001 0.021 98386 2024-02-18T09:11:50.814 0.125 -0.000 -0.013 98398 2024-02-19T09:30:50.814 0.019 -0.000 -0.005 98414 2024-02-20T17:47:50.814 -0.100 -0.001 -0.034 98434 2024-02-22T07:30:50.814 0.130 0.001 0.047 98459 2024-02-24T09:47:50.814 -0.042 0.001 0.016 98471 2024-02-25T09:17:50.814 0.048 0.000 -0.013 98487 2024-02-26T17:40:50.814 -0.073 0.001 -0.003 98509 2024-02-28T12:23:50.814 -0.003 0.000 0.001 98518 2024-02-29T07:15:50.814 0.028 -0.000 0.010 98536 2024-03-01T17:26:50.814 0.038 -0.000 0.002 98546 2024-03-02T14:15:50.814 -0.012 -0.000 -0.001 98560 2024-03-03T16:44:50.814 -0.028 0.000 -0.006 98578 2024-03-05T05:39:50.814 0.067 -0.001 0.018 98605 2024-03-07T10:20:50.814 0.021 -0.000 -0.009 98617 2024-03-08T10:22:50.814 0.039 0.000 -0.007 98629 2024-03-09T08:52:50.814 0.013 0.000 0.006 98645 2024-03-10T16:36:50.814 -0.080 -0.001 -0.026 98665 2024-03-12T08:32:50.814 0.036 0.000 -0.009 98684 2024-03-13T21:40:50.814 0.013 -0.000 0.004 98703 2024-03-15T11:39:50.814 -0.023 0.000 0.007 98716 2024-03-16T14:21:50.814 0.076 0.000 0.026 98728 2024-03-17T14:20:50.814 -0.035 -0.000 -0.018 98741 2024-03-18T14:21:50.814 0.038 0.000 0.010 98760 2024-03-20T04:51:50.814 0.021 -0.001 -0.006 98779 2024-03-21T17:57:50.814 0.025 -0.000 -0.012 98801 2024-03-23T13:53:50.814 0.010 0.000 -0.003 98813 2024-03-24T13:34:50.814 0.005 -0.000 -0.001 98823 2024-03-25T09:20:50.814 0.006 0.000 -0.002 98835 2024-03-26T08:11:50.814 0.009 0.000 0.001 98847 2024-03-27T09:21:50.814 -0.029 0.000 -0.015 98862 2024-03-28T14:46:50.814 0.005 -0.000 0.002 98886 2024-03-30T13:42:50.814 0.016 -0.000 -0.008 98898 2024-03-31T14:20:50.814 -0.016 0.000 -0.008