2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Aug 2 08:47:50 PDT 2022 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 90026 through 91131): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2022 APR 01 00:01:09.185 2022 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_od90101-90183_rec_v1.bsp spk_m_od90181-90260_rec_v1.bsp spk_m_od90259-90357_rec_v1.bsp spk_m_od90356-90442_rec_v1.bsp spk_m_od90441-90528_rec_v1.bsp spk_m_od90525-90615_rec_v1.bsp spk_m_od90613-90689_rec_v1.bsp spk_m_od90687-90783_rec_v1.bsp spk_m_od90781-90869_rec_v1.bsp spk_m_od90867-90947_rec_v1.bsp spk_m_od90945-91025_rec_v1.bsp spk_m_od91023-91113_rec_v1.bsp spk_m_od91111-91207_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_ext71.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 90037 2022-04-01T22:17:50.814 -0.012 -0.000 0.002 90047 2022-04-02T18:43:50.814 -0.036 0.000 0.013 90062 2022-04-03T23:27:50.814 0.013 -0.000 0.004 90082 2022-04-05T16:19:50.814 -0.006 0.000 -0.002 90101 2022-04-07T05:51:50.814 0.004 0.000 0.001 90129 2022-04-09T12:44:50.814 -0.008 0.000 0.004 90150 2022-04-11T06:12:50.814 -0.000 0.000 0.000 90163 2022-04-12T07:54:50.814 0.007 0.000 -0.003 90181 2022-04-13T19:58:50.814 -0.013 -0.000 -0.005 90210 2022-04-16T04:03:50.814 -0.008 0.000 -0.000 90228 2022-04-17T17:13:50.814 -0.014 -0.000 -0.009 90244 2022-04-18T22:58:50.814 0.037 0.000 0.019 90259 2022-04-20T04:46:50.814 -0.022 -0.000 -0.006 90279 2022-04-21T21:04:50.814 -0.007 0.000 0.004 90297 2022-04-23T09:33:50.814 -0.008 -0.000 -0.005 90309 2022-04-24T07:50:50.814 -0.007 -0.000 0.002 90323 2022-04-25T11:04:50.814 0.012 -0.000 0.007 90340 2022-04-26T21:30:50.814 0.001 -0.000 -0.001 90356 2022-04-28T04:30:50.814 -0.024 -0.000 -0.004 90371 2022-04-29T10:38:50.814 -0.008 -0.000 0.006 90385 2022-04-30T14:29:50.814 -0.006 -0.000 0.004 90398 2022-05-01T15:49:50.814 -0.019 0.000 0.010 90418 2022-05-03T07:41:50.814 -0.010 -0.000 0.007 90431 2022-05-04T10:25:50.814 0.035 0.000 0.022 90441 2022-05-05T05:48:50.814 -0.022 -0.001 -0.013 90467 2022-05-07T08:30:50.814 -0.010 0.000 0.007 90484 2022-05-08T18:51:50.814 0.004 0.000 0.002 90503 2022-05-10T07:37:50.814 -0.000 0.000 -0.000 90518 2022-05-11T13:11:50.814 -0.016 0.000 0.012 90525 2022-05-12T04:00:50.814 0.005 0.000 0.004 90539 2022-05-13T06:01:50.814 -0.004 0.000 -0.001 90568 2022-05-15T15:51:50.814 0.004 -0.000 -0.003 90587 2022-05-17T05:35:50.814 0.006 -0.000 -0.005 90603 2022-05-18T12:52:50.814 -0.005 -0.000 0.002 90613 2022-05-19T09:42:50.814 0.004 -0.000 0.003 90631 2022-05-20T20:30:50.814 -0.022 0.000 0.018 90639 2022-05-21T12:21:50.814 0.025 -0.000 -0.020 90660 2022-05-23T05:45:50.814 -0.004 -0.000 0.003 90687 2022-05-25T11:56:50.814 -0.007 -0.000 -0.005 90708 2022-05-27T04:40:50.814 -0.015 0.000 0.013 90722 2022-05-28T08:21:50.815 0.014 -0.000 -0.012 90733 2022-05-29T06:05:50.815 -0.005 0.000 0.004 90745 2022-05-30T05:47:50.815 -0.001 0.000 0.001 90757 2022-05-31T06:30:50.815 -0.002 -0.000 -0.002 90781 2022-06-02T05:41:50.815 0.005 -0.000 0.004 90794 2022-06-03T06:25:50.815 0.002 0.000 -0.001 90808 2022-06-04T10:05:50.815 -0.008 -0.000 0.007 90821 2022-06-05T11:56:50.815 0.010 -0.000 -0.009 90834 2022-06-06T13:38:50.815 -0.001 0.000 0.001 90854 2022-06-08T05:10:50.815 -0.003 0.000 0.003 90867 2022-06-09T07:58:50.815 -0.007 -0.000 -0.005 90887 2022-06-10T22:21:50.815 -0.002 0.000 0.002 90906 2022-06-12T12:52:50.815 0.004 0.000 0.003 90922 2022-06-13T19:28:50.815 -0.009 0.000 0.008 90936 2022-06-14T22:46:50.815 0.003 -0.000 -0.001 90945 2022-06-15T17:46:50.815 0.009 0.000 0.008 90964 2022-06-17T07:36:50.815 0.005 0.000 0.005 90977 2022-06-18T09:20:50.815 0.001 -0.000 0.001 90988 2022-06-19T05:54:50.815 0.004 -0.000 -0.004 91002 2022-06-20T09:36:50.815 -0.000 -0.000 0.000 91016 2022-06-21T12:46:50.815 0.003 0.000 -0.000 91023 2022-06-22T04:18:50.815 -0.005 0.000 -0.003 91052 2022-06-24T12:18:50.815 0.010 -0.000 -0.009 91065 2022-06-25T14:03:50.815 -0.012 0.000 0.012 91078 2022-06-26T15:18:50.815 0.000 -0.000 0.000 91085 2022-06-27T05:26:50.815 0.009 -0.000 -0.008 91111 2022-06-29T09:49:50.815 0.003 0.000 0.002 91126 2022-06-30T14:37:50.815 0.007 -0.000 -0.007