2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 4 06:59:44 PST 2025 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 101127 through 102243): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2024 OCT 01 00:01:09.182 2025 JAN 01 01:01:09.183 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: 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_ext81.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 101128 2024-10-01T03:34:50.817 0.003 0.000 -0.003 101141 2024-10-02T06:03:50.817 0.000 -0.000 -0.001 101156 2024-10-03T11:41:50.817 -0.005 -0.000 -0.005 101178 2024-10-05T06:21:50.817 0.001 -0.000 -0.000 101198 2024-10-06T21:48:50.817 -0.008 0.000 0.009 101215 2024-10-08T07:27:50.817 -0.001 0.000 0.001 101227 2024-10-09T07:10:50.817 0.009 0.000 -0.009 101240 2024-10-10T09:40:50.817 -0.010 -0.000 -0.008 101263 2024-10-12T06:17:50.817 -0.002 0.000 0.002 101276 2024-10-13T07:58:50.817 -0.001 0.000 0.001 101289 2024-10-14T11:08:50.817 -0.006 -0.000 -0.000 101302 2024-10-15T12:28:50.817 0.003 0.000 0.003 101321 2024-10-17T01:44:50.817 -0.008 -0.000 -0.007 101347 2024-10-19T03:58:50.817 -0.005 -0.000 0.003 101363 2024-10-20T11:55:50.817 -0.013 0.000 0.013 101376 2024-10-21T13:31:50.817 0.007 -0.000 -0.007 101396 2024-10-23T06:05:50.817 0.002 -0.000 0.002 101411 2024-10-24T11:56:50.817 -0.002 0.000 -0.001 101428 2024-10-25T19:57:50.817 0.003 0.000 -0.001 101452 2024-10-27T19:48:50.817 -0.002 0.000 0.002 101475 2024-10-29T17:15:50.817 -0.001 -0.000 0.002 101485 2024-10-30T12:59:50.817 0.003 0.000 -0.002 101496 2024-10-31T11:32:50.817 0.003 0.000 0.002 101517 2024-11-02T04:11:50.817 -0.003 -0.000 0.003 101533 2024-11-03T11:47:50.817 0.003 -0.000 -0.003 101552 2024-11-05T02:37:50.817 0.001 0.000 0.001 101565 2024-11-06T04:23:50.817 0.001 0.000 0.001 101576 2024-11-07T00:35:50.817 -0.001 0.000 0.001 101590 2024-11-08T05:49:50.817 -0.002 0.000 -0.001 101602 2024-11-09T05:39:50.817 0.008 -0.000 0.000 101622 2024-11-10T19:43:50.817 -0.008 -0.000 0.007 101642 2024-11-12T11:16:50.817 0.004 0.000 -0.004 101654 2024-11-13T10:55:50.817 -0.007 0.000 0.006 101663 2024-11-14T05:31:50.817 0.003 0.000 0.002 101680 2024-11-15T14:20:50.817 0.002 -0.000 -0.002 101699 2024-11-17T03:54:50.817 0.004 -0.000 -0.003 101712 2024-11-18T07:06:50.817 -0.003 0.000 0.001 101737 2024-11-20T06:59:50.817 -0.003 -0.000 0.003 101748 2024-11-21T05:59:50.817 -0.003 -0.000 -0.001 101766 2024-11-22T17:35:50.817 -0.010 -0.000 -0.004 101781 2024-11-23T21:47:50.817 0.009 0.000 -0.007 101802 2024-11-25T15:29:50.817 -0.001 -0.000 0.000 101812 2024-11-26T11:08:50.817 -0.003 -0.000 0.003 101825 2024-11-27T14:04:50.816 0.005 0.000 0.003 101847 2024-11-29T08:25:50.816 0.002 0.000 -0.002 101861 2024-11-30T13:26:50.816 -0.009 0.000 -0.001 101886 2024-12-02T13:30:50.816 0.011 -0.000 -0.007 101899 2024-12-03T15:12:50.816 0.001 -0.000 -0.000 101919 2024-12-05T07:21:50.816 -0.004 0.000 -0.002 101932 2024-12-06T09:34:50.816 -0.007 -0.000 -0.003 101946 2024-12-07T13:15:50.816 0.007 -0.000 0.002 101968 2024-12-09T07:06:50.816 -0.003 -0.000 0.001 101986 2024-12-10T19:05:50.816 0.009 0.000 -0.005 102006 2024-12-12T11:13:50.816 0.009 -0.000 0.004 102026 2024-12-14T03:00:50.816 -0.015 0.000 -0.008 102041 2024-12-15T07:55:50.816 0.027 -0.000 -0.010 102056 2024-12-16T13:23:50.816 -0.007 0.000 0.004 102069 2024-12-17T16:36:50.816 0.020 0.000 -0.004 102079 2024-12-18T11:49:50.816 -0.009 -0.000 -0.004 102087 2024-12-19T02:28:50.816 0.026 0.000 -0.012 102102 2024-12-20T08:31:50.816 -0.014 -0.000 0.003 102118 2024-12-21T16:16:50.816 0.023 -0.000 -0.001 102144 2024-12-23T20:02:50.816 -0.000 -0.000 0.000 102163 2024-12-25T08:33:50.816 0.003 0.000 -0.001 102178 2024-12-26T15:37:50.816 0.030 -0.000 0.008 102192 2024-12-27T18:47:50.816 -0.012 -0.000 -0.003 102200 2024-12-28T10:17:50.816 -0.022 0.000 0.001 102214 2024-12-29T14:22:50.816 0.036 0.000 0.012 102223 2024-12-30T07:07:50.816 0.016 0.000 -0.005 102239 2024-12-31T15:33:50.816 -0.054 0.000 -0.009