2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed May 3 08:08:43 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 93366 through 94458): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2023 JAN 01 00:01:09.183 2023 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_od93331-93417_rec_v1.bsp spk_m_od93415-93501_rec_v1.bsp spk_m_od93499-93583_rec_v1.bsp spk_m_od93581-93674_rec_v1.bsp spk_m_od93672-93762_rec_v1.bsp spk_m_od93761-93831_rec_v1.bsp spk_m_od93830-93923_rec_v1.bsp spk_m_od93922-94015_rec_v1.bsp spk_m_od94015-94094_rec_v1.bsp spk_m_od94092-94188_rec_v1.bsp spk_m_od94187-94263_rec_v1.bsp spk_m_od94262-94354_rec_v1.bsp spk_m_od94353-94421_rec_v1.bsp spk_m_od94419-94528_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_ext74.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 93367 2023-01-01T04:23:50.816 0.033 0.000 0.004 93382 2023-01-02T08:19:50.816 -0.043 -0.001 -0.014 93391 2023-01-03T02:42:50.816 0.010 0.000 -0.000 93409 2023-01-04T15:02:50.815 -0.011 0.000 0.003 93415 2023-01-05T01:27:50.815 0.028 0.000 0.009 93434 2023-01-06T14:57:50.815 0.025 0.000 0.007 93454 2023-01-08T06:42:50.815 -0.010 0.000 -0.004 93468 2023-01-09T10:22:50.815 -0.002 0.000 -0.001 93476 2023-01-10T03:43:50.815 -0.008 -0.000 -0.001 93489 2023-01-11T03:38:50.815 -0.033 -0.001 -0.009 93499 2023-01-11T23:33:50.815 0.023 0.000 0.009 93516 2023-01-13T09:03:50.815 -0.017 0.000 -0.006 93529 2023-01-14T12:01:50.815 -0.003 0.000 0.001 93537 2023-01-15T03:16:50.815 -0.000 -0.000 0.000 93547 2023-01-16T00:03:50.815 0.002 0.000 -0.000 93564 2023-01-17T08:12:50.815 -0.014 0.000 -0.006 93573 2023-01-18T03:11:50.815 0.012 0.000 -0.004 93581 2023-01-18T19:21:50.815 -0.006 0.000 -0.001 93597 2023-01-20T01:52:50.815 0.012 -0.000 -0.001 93609 2023-01-21T02:21:50.815 -0.001 -0.000 0.000 93622 2023-01-22T02:57:50.815 -0.007 -0.000 -0.003 93639 2023-01-23T13:39:50.815 0.006 0.000 -0.002 93658 2023-01-25T02:41:50.815 -0.006 0.000 0.002 93672 2023-01-26T05:17:50.815 0.011 0.000 0.004 93688 2023-01-27T13:35:50.815 0.015 0.000 0.002 93707 2023-01-29T03:45:50.815 0.007 0.000 -0.004 93717 2023-01-29T22:46:50.815 -0.017 -0.000 -0.007 93731 2023-01-31T02:31:50.815 0.005 0.000 0.001 93747 2023-02-01T11:00:50.815 -0.002 0.000 0.001 93761 2023-02-02T13:44:50.815 -0.000 -0.000 -0.000 93772 2023-02-03T12:21:50.815 0.001 0.000 -0.001 93793 2023-02-05T05:22:50.815 -0.003 0.000 0.001 93806 2023-02-06T07:24:50.815 0.003 0.000 -0.002 93830 2023-02-08T05:35:50.815 -0.009 -0.000 -0.004 93850 2023-02-09T22:29:50.815 -0.002 -0.000 0.001 93868 2023-02-11T09:14:50.814 -0.003 -0.000 -0.001 93882 2023-02-12T12:44:50.814 0.006 0.000 0.003 93893 2023-02-13T10:39:50.814 0.000 0.000 0.000 93912 2023-02-15T00:29:50.814 0.008 -0.000 -0.002 93922 2023-02-15T19:25:50.814 -0.007 -0.000 -0.003 93940 2023-02-17T08:19:50.814 -0.006 -0.000 0.004 93960 2023-02-18T23:52:50.814 0.006 0.000 -0.004 93977 2023-02-20T08:54:50.814 -0.001 -0.000 0.000 93996 2023-02-21T22:59:50.814 -0.000 -0.000 0.000 94015 2023-02-23T11:14:50.814 -0.003 -0.000 -0.002 94034 2023-02-25T01:10:50.814 0.001 0.000 0.001 94046 2023-02-26T01:24:50.814 0.003 0.000 -0.001 94059 2023-02-27T03:29:50.814 -0.004 0.000 0.002 94070 2023-02-28T01:11:50.814 0.004 0.000 -0.003 94092 2023-03-01T20:02:50.814 0.000 -0.000 0.000 94111 2023-03-03T09:23:50.814 0.012 -0.000 0.006 94131 2023-03-05T01:09:50.814 -0.010 -0.000 -0.001 94147 2023-03-06T08:22:50.814 0.002 -0.000 0.001 94159 2023-03-07T08:44:50.814 -0.002 -0.000 0.001 94177 2023-03-08T20:41:50.814 0.001 0.000 -0.001 94187 2023-03-09T15:57:50.814 0.000 -0.000 0.000 94214 2023-03-11T21:48:50.814 0.012 -0.000 -0.008 94228 2023-03-13T00:52:50.814 -0.009 0.000 0.000 94240 2023-03-14T00:48:50.814 0.001 0.000 -0.000 94262 2023-03-15T19:23:50.814 0.001 0.000 0.001 94282 2023-03-17T11:27:50.814 0.007 -0.000 0.002 94300 2023-03-18T23:44:50.814 -0.003 -0.000 0.002 94314 2023-03-20T03:22:50.814 0.005 0.000 -0.005 94330 2023-03-21T10:59:50.814 -0.009 -0.000 0.007 94342 2023-03-22T10:44:50.814 0.004 -0.000 -0.003 94353 2023-03-23T07:14:50.814 0.004 0.000 0.003 94367 2023-03-24T11:16:50.814 0.006 0.000 0.004 94385 2023-03-25T23:42:50.814 0.004 0.000 -0.003 94406 2023-03-27T17:10:50.814 -0.001 0.000 0.001 94413 2023-03-28T07:02:50.814 0.001 -0.000 -0.001 94419 2023-03-28T17:58:50.814 0.003 0.000 0.002 94445 2023-03-30T22:15:50.814 -0.000 0.000 0.000