2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Nov 5 05:53:42 PDT 2021 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 86699 through 87815): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2021 JUL 01 00:01:09.184 2021 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_od86621-86699_rec_v1.bsp spk_m_od86698-86793_rec_v1.bsp spk_m_od86791-86868_rec_v1.bsp spk_m_od86867-86958_rec_v1.bsp spk_m_od86957-87041_rec_v1.bsp spk_m_od87040-87121_rec_v1.bsp spk_m_od87119-87207_rec_v1.bsp spk_m_od87206-87302_rec_v1.bsp spk_m_od87301-87383_rec_v1.bsp spk_m_od87382-87470_rec_v1.bsp spk_m_od87468-87557_rec_v1.bsp spk_m_od87556-87639_rec_v1.bsp spk_m_od87637-87727_rec_v1.bsp spk_m_od87725-87803_rec_v1.bsp spk_m_od87802-87857_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_ext68.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 86699 2021-07-01T00:32:50.815 0.003 -0.000 0.000 86728 2021-07-03T12:35:50.815 0.005 0.000 -0.003 86744 2021-07-04T19:02:50.815 -0.000 0.000 0.000 86761 2021-07-06T05:04:50.816 -0.005 0.000 -0.001 86780 2021-07-07T19:16:50.816 0.008 -0.000 -0.005 86791 2021-07-08T15:43:50.816 -0.009 -0.000 -0.004 86807 2021-07-10T00:36:50.816 0.009 -0.000 -0.006 86827 2021-07-11T16:14:50.816 -0.008 -0.000 0.004 86839 2021-07-12T15:48:50.816 0.003 0.000 -0.002 86853 2021-07-13T19:32:50.816 -0.014 0.000 0.009 86867 2021-07-14T21:57:50.816 0.013 0.000 0.007 86886 2021-07-16T11:39:50.816 0.008 -0.000 0.005 86899 2021-07-17T13:53:50.816 0.007 -0.000 -0.000 86914 2021-07-18T19:46:50.816 -0.013 0.000 0.006 86931 2021-07-20T05:44:50.816 0.006 0.000 -0.003 86946 2021-07-21T10:23:50.816 0.001 -0.000 0.001 86957 2021-07-22T08:43:50.816 -0.003 0.000 0.001 86981 2021-07-24T07:41:50.816 0.006 -0.000 0.003 87005 2021-07-26T07:51:50.816 -0.021 -0.000 0.014 87029 2021-07-28T07:25:50.816 0.014 0.000 -0.008 87040 2021-07-29T03:48:50.816 -0.010 -0.000 -0.005 87057 2021-07-30T13:50:50.816 -0.012 0.000 -0.006 87080 2021-08-01T12:14:50.816 0.012 0.000 -0.007 87108 2021-08-03T19:34:50.816 0.007 -0.000 -0.004 87119 2021-08-04T16:08:50.816 -0.018 0.000 -0.011 87141 2021-08-06T11:35:50.816 -0.016 -0.000 -0.011 87158 2021-08-07T22:23:50.816 0.016 0.000 -0.009 87169 2021-08-08T18:57:50.816 -0.001 -0.000 -0.001 87181 2021-08-09T18:56:50.816 0.021 -0.000 0.009 87197 2021-08-11T03:28:50.816 0.003 0.000 -0.002 87206 2021-08-11T20:08:50.816 -0.021 -0.000 -0.013 87218 2021-08-12T20:40:50.817 0.002 -0.000 -0.001 87240 2021-08-14T16:21:50.817 0.004 0.000 -0.002 87257 2021-08-16T02:03:50.817 0.001 -0.000 -0.001 87270 2021-08-17T03:45:50.817 -0.002 -0.000 0.001 87289 2021-08-18T17:17:50.817 0.027 0.000 -0.014 87301 2021-08-19T15:35:50.817 -0.054 -0.000 -0.024 87314 2021-08-20T18:27:50.817 -0.011 0.000 0.007 87328 2021-08-21T21:51:50.817 -0.009 -0.000 0.003 87347 2021-08-23T10:50:50.817 0.032 -0.000 0.018 87360 2021-08-24T12:40:50.817 -0.045 0.000 -0.019 87382 2021-08-26T08:18:50.817 0.018 -0.000 0.003 87403 2021-08-28T02:36:50.817 -0.000 -0.000 0.000 87423 2021-08-29T18:06:50.817 -0.012 -0.000 0.006 87435 2021-08-30T17:47:50.817 0.022 -0.000 -0.011 87468 2021-09-02T09:48:50.817 -0.010 -0.000 -0.006 87480 2021-09-03T09:52:50.817 -0.013 0.000 -0.005 87493 2021-09-04T11:40:50.817 -0.005 0.000 -0.001 87512 2021-09-06T01:06:50.817 0.015 0.000 0.005 87533 2021-09-07T17:36:50.817 -0.005 -0.000 0.002 87556 2021-09-09T15:30:50.817 0.007 0.000 0.002 87573 2021-09-11T00:39:50.817 -0.016 -0.000 0.006 87596 2021-09-12T23:20:50.817 0.001 0.000 0.000 87610 2021-09-14T01:46:50.817 0.022 0.001 -0.008 87637 2021-09-16T08:04:50.817 -0.002 0.000 -0.000 87668 2021-09-18T20:24:50.817 0.021 0.000 -0.007 87683 2021-09-20T02:03:50.817 0.011 0.000 -0.004 87708 2021-09-22T03:25:50.817 0.023 -0.000 -0.008 87725 2021-09-23T13:44:50.817 -0.019 0.000 -0.010 87739 2021-09-24T16:44:50.817 0.050 0.001 -0.016 87751 2021-09-25T16:27:50.817 -0.002 -0.000 0.001 87763 2021-09-26T16:42:50.817 -0.030 0.000 -0.014 87775 2021-09-27T16:37:50.817 0.010 0.000 0.005 87786 2021-09-28T15:17:50.817 -0.021 -0.000 0.011 87802 2021-09-29T21:36:50.817 -0.029 0.000 -0.008