2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Sat Nov 4 08:00:27 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 95564 through 96681): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2023 JUL 01 00:01:09.184 2023 OCT 01 01:01:09.182 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_od95548-95626_rec_v1.bsp spk_m_od95625-95711_rec_v1.bsp spk_m_od95710-95785_rec_v1.bsp spk_m_od95785-95883_rec_v1.bsp spk_m_od95881-95972_rec_v1.bsp spk_m_od95972-96047_rec_v1.bsp spk_m_od96046-96141_rec_v1.bsp spk_m_od96140-96216_rec_v1.bsp spk_m_od96215-96305_rec_v1.bsp spk_m_od96304-96390_rec_v1.bsp spk_m_od96390-96471_rec_v1.bsp spk_m_od96470-96562_rec_v1.bsp spk_m_od96561-96641_rec_v1.bsp spk_m_od96639-96737_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_ext76.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 95568 2023-07-01T09:15:50.815 0.003 -0.000 -0.001 95580 2023-07-02T09:14:50.815 -0.000 0.000 -0.000 95598 2023-07-03T20:29:50.815 -0.001 -0.000 0.000 95614 2023-07-05T03:54:50.815 -0.003 -0.000 -0.001 95625 2023-07-06T01:03:50.816 0.009 0.000 0.007 95642 2023-07-07T11:52:50.816 0.006 -0.000 -0.005 95662 2023-07-09T03:22:50.816 -0.001 -0.000 0.001 95676 2023-07-10T06:52:50.816 -0.003 0.000 0.003 95689 2023-07-11T08:44:50.816 0.006 0.000 -0.006 95710 2023-07-13T01:16:50.816 0.007 0.000 0.005 95723 2023-07-14T03:55:50.816 0.014 -0.000 -0.012 95740 2023-07-15T12:35:50.816 -0.007 0.000 -0.006 95761 2023-07-17T07:03:50.816 0.004 0.000 -0.003 95774 2023-07-18T08:43:50.816 0.001 0.000 -0.001 95785 2023-07-19T05:15:50.816 -0.002 0.000 -0.002 95811 2023-07-21T09:00:50.816 0.016 -0.000 0.011 95828 2023-07-22T19:26:50.816 -0.018 -0.000 0.015 95843 2023-07-24T01:05:50.816 -0.001 -0.000 0.001 95865 2023-07-25T19:33:50.816 -0.000 -0.000 -0.000 95881 2023-07-27T03:26:50.816 -0.002 0.000 -0.001 95898 2023-07-28T13:46:50.816 -0.003 -0.000 0.002 95917 2023-07-30T03:18:50.816 -0.001 -0.000 0.001 95929 2023-07-31T02:57:50.816 0.002 -0.000 -0.002 95943 2023-08-01T06:38:50.816 -0.011 -0.000 0.009 95959 2023-08-02T14:08:50.816 0.008 -0.000 -0.006 95972 2023-08-03T14:47:50.816 -0.005 -0.001 -0.003 95995 2023-08-05T13:18:50.816 0.002 -0.000 -0.002 96006 2023-08-06T11:14:50.816 -0.004 -0.000 0.004 96017 2023-08-07T08:42:50.816 0.010 0.000 -0.006 96032 2023-08-08T14:37:50.816 -0.015 -0.000 0.011 96046 2023-08-09T17:02:50.816 0.007 0.000 0.005 96063 2023-08-11T02:52:50.816 -0.013 0.000 -0.010 96071 2023-08-11T19:24:50.816 0.011 -0.000 -0.007 96107 2023-08-14T18:51:50.817 -0.006 -0.000 0.004 96128 2023-08-16T12:17:50.817 0.008 -0.000 -0.005 96140 2023-08-17T11:47:50.817 0.007 0.000 -0.005 96160 2023-08-19T03:14:50.817 -0.003 0.000 0.002 96171 2023-08-20T00:52:50.817 -0.000 -0.000 0.000 96180 2023-08-20T18:58:50.817 0.013 -0.000 -0.009 96204 2023-08-22T17:44:50.817 -0.007 0.000 -0.003 96215 2023-08-23T15:52:50.817 0.002 -0.000 -0.001 96237 2023-08-25T11:41:50.817 -0.014 0.000 0.010 96262 2023-08-27T13:11:50.817 -0.018 0.000 0.012 96277 2023-08-28T18:38:50.817 0.006 -0.000 -0.005 96292 2023-08-30T00:18:50.817 0.024 -0.000 -0.017 96304 2023-08-30T23:17:50.817 -0.013 0.000 -0.007 96313 2023-08-31T17:57:50.817 -0.005 -0.000 0.004 96334 2023-09-02T11:28:50.817 -0.005 0.000 0.003 96352 2023-09-03T23:02:50.817 0.002 -0.000 -0.001 96373 2023-09-05T16:33:50.817 -0.005 0.000 0.003 96390 2023-09-07T00:48:50.817 0.010 0.000 0.005 96409 2023-09-08T15:02:50.817 -0.005 -0.000 -0.000 96419 2023-09-09T11:18:50.817 -0.015 0.000 0.010 96433 2023-09-10T14:33:50.817 0.026 -0.000 -0.004 96451 2023-09-12T01:38:50.817 0.006 0.000 0.004 96470 2023-09-13T16:03:50.817 -0.022 -0.000 0.014 96486 2023-09-14T23:52:50.817 -0.002 0.000 0.001 96505 2023-09-16T12:03:50.817 -0.007 0.000 -0.003 96526 2023-09-18T06:20:50.817 -0.001 -0.000 -0.000 96541 2023-09-19T12:20:50.817 0.018 0.000 -0.010 96561 2023-09-21T02:43:50.817 0.004 0.000 0.001 96576 2023-09-22T09:41:50.817 -0.003 0.000 0.001 96596 2023-09-24T00:08:50.817 -0.002 0.000 -0.001 96614 2023-09-25T11:40:50.817 -0.014 -0.000 -0.009 96630 2023-09-26T19:25:50.817 0.013 -0.000 0.007 96639 2023-09-27T12:49:50.817 0.012 0.000 0.005 96664 2023-09-29T15:42:50.817 0.011 0.000 -0.005