2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Aug 2 16:04:21 PDT 2023 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 94459 through 95563): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2023 APR 01 00:01:09.185 2023 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_od94419-94528_rec_v1.bsp spk_m_od94526-94607_rec_v1.bsp spk_m_od94606-94694_rec_v1.bsp spk_m_od94693-94765_rec_v1.bsp spk_m_od94763-94862_rec_v1.bsp spk_m_od94861-94936_rec_v1.bsp spk_m_od94935-95033_rec_v1.bsp spk_m_od95031-95118_rec_v1.bsp spk_m_od95117-95202_rec_v1.bsp spk_m_od95201-95287_rec_v1.bsp spk_m_od95285-95371_rec_v1.bsp spk_m_od95370-95444_rec_v1.bsp spk_m_od95443-95548_rec_v1.bsp spk_m_od95548-95626_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_ext75.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 94462 2023-04-01T07:52:50.814 0.001 0.000 -0.001 94480 2023-04-02T19:05:50.814 0.007 0.000 -0.003 94492 2023-04-03T19:11:50.814 -0.007 0.000 0.005 94506 2023-04-04T22:51:50.814 0.003 -0.000 -0.002 94526 2023-04-06T13:24:50.814 -0.012 -0.000 -0.010 94546 2023-04-08T05:11:50.814 -0.008 -0.000 -0.003 94566 2023-04-09T21:25:50.814 -0.003 0.000 0.002 94585 2023-04-11T10:44:50.814 0.004 -0.000 -0.003 94606 2023-04-13T03:14:50.814 -0.001 -0.000 -0.001 94621 2023-04-14T10:03:50.814 0.004 0.000 -0.004 94633 2023-04-15T09:47:50.814 -0.006 0.000 0.005 94644 2023-04-16T07:20:50.814 0.001 -0.000 -0.001 94664 2023-04-17T22:44:50.814 0.003 0.000 -0.002 94681 2023-04-19T08:40:50.814 -0.001 -0.000 0.001 94693 2023-04-20T07:30:50.814 -0.001 -0.000 -0.001 94702 2023-04-21T01:10:50.814 0.003 -0.000 0.002 94730 2023-04-23T09:31:50.814 0.008 -0.000 -0.006 94751 2023-04-25T02:56:50.814 -0.003 0.000 0.003 94763 2023-04-26T02:31:50.814 -0.001 0.000 0.001 94785 2023-04-27T21:18:50.814 -0.001 -0.000 -0.001 94800 2023-04-29T03:13:50.814 -0.003 0.000 -0.001 94819 2023-04-30T16:23:50.814 0.001 -0.000 0.001 94838 2023-05-02T06:33:50.814 -0.004 0.000 0.001 94861 2023-05-04T03:12:50.814 -0.006 -0.000 -0.005 94874 2023-05-05T06:05:50.814 -0.008 -0.000 0.007 94900 2023-05-07T09:29:50.814 -0.000 -0.000 0.000 94924 2023-05-09T08:53:50.814 0.010 -0.000 -0.008 94935 2023-05-10T05:26:50.814 -0.012 0.000 -0.009 94952 2023-05-11T16:09:50.814 -0.006 -0.000 0.006 94967 2023-05-12T21:27:50.814 0.003 -0.000 -0.001 94982 2023-05-14T03:32:50.814 0.004 0.000 -0.004 95007 2023-05-16T04:12:50.814 -0.002 0.000 -0.001 95031 2023-05-18T03:22:50.814 0.005 -0.000 0.004 95054 2023-05-20T01:49:50.814 0.013 -0.000 -0.011 95074 2023-05-21T17:21:50.814 -0.010 -0.000 0.008 95096 2023-05-23T12:50:50.814 0.003 0.001 -0.002 95117 2023-05-25T06:03:50.814 -0.006 -0.000 0.004 95130 2023-05-26T08:00:50.814 -0.002 0.000 0.001 95143 2023-05-27T09:15:50.814 -0.002 0.000 0.001 95157 2023-05-28T12:22:50.815 0.002 -0.000 0.002 95175 2023-05-30T00:58:50.815 0.001 -0.000 -0.001 95201 2023-06-01T03:28:50.815 -0.006 0.000 -0.004 95216 2023-06-02T09:41:50.815 0.000 -0.000 -0.000 95228 2023-06-03T09:06:50.815 -0.009 0.000 -0.001 95246 2023-06-04T20:41:50.815 0.001 0.000 0.000 95264 2023-06-06T08:21:50.815 0.001 -0.000 -0.000 95275 2023-06-07T06:06:50.815 0.004 -0.000 -0.001 95285 2023-06-08T01:34:50.815 -0.001 0.000 -0.001 95300 2023-06-09T07:55:50.815 -0.000 -0.000 0.000 95316 2023-06-10T15:35:50.815 0.000 -0.000 -0.000 95335 2023-06-12T05:09:50.815 0.006 0.000 -0.006 95359 2023-06-14T04:06:50.815 0.003 -0.000 -0.001 95370 2023-06-15T01:07:50.815 -0.003 -0.000 -0.002 95386 2023-06-16T09:21:50.815 0.000 -0.000 0.000 95415 2023-06-18T19:15:50.815 0.001 0.000 -0.001 95425 2023-06-19T14:31:50.815 -0.002 -0.000 0.000 95443 2023-06-21T02:15:50.815 0.001 -0.000 -0.001 95468 2023-06-23T03:58:50.815 -0.005 -0.000 0.004 95489 2023-06-24T21:30:50.815 -0.004 -0.000 0.003 95506 2023-06-26T07:05:50.815 0.004 -0.000 -0.003 95526 2023-06-27T22:36:50.815 0.003 -0.000 -0.003 95548 2023-06-29T16:53:50.815 -0.004 -0.000 -0.003