2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Nov 1 10:21:34 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 91132 through 92248): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2022 JUL 01 00:01:09.184 2022 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_od91111-91207_rec_v1.bsp spk_m_od91204-91296_rec_v1.bsp spk_m_od91294-91364_rec_v1.bsp spk_m_od91362-91465_rec_v1.bsp spk_m_od91463-91550_rec_v1.bsp spk_m_od91548-91639_rec_v1.bsp spk_m_od91636-91721_rec_v1.bsp spk_m_od91720-91801_rec_v1.bsp spk_m_od91799-91891_rec_v1.bsp spk_m_od91890-91961_rec_v1.bsp spk_m_od91959-92046_rec_v1.bsp spk_m_od92044-92131_rec_v1.bsp spk_m_od92129-92226_rec_v1.bsp spk_m_od92224-92312_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_ext72.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 91150 2022-07-02T13:49:50.815 -0.002 -0.000 0.001 91162 2022-07-03T13:12:50.815 -0.003 -0.000 -0.001 91182 2022-07-05T05:16:50.815 0.006 0.000 -0.006 91194 2022-07-06T04:32:50.816 -0.002 -0.000 0.000 91204 2022-07-07T01:52:50.816 -0.000 0.000 0.000 91220 2022-07-08T09:29:50.816 0.008 -0.000 0.007 91247 2022-07-10T13:42:50.816 0.000 -0.000 -0.000 91267 2022-07-12T04:59:50.816 -0.000 0.000 0.000 91279 2022-07-13T05:59:50.816 0.000 0.000 0.000 91294 2022-07-14T11:24:50.816 -0.000 -0.000 -0.000 91307 2022-07-15T12:16:50.816 0.009 -0.000 -0.009 91319 2022-07-16T11:30:50.816 -0.003 -0.000 0.000 91333 2022-07-17T15:39:50.816 0.003 -0.000 -0.003 91352 2022-07-19T05:09:50.816 -0.005 -0.000 0.005 91362 2022-07-20T01:46:50.816 -0.001 0.000 -0.001 91394 2022-07-22T16:11:50.816 -0.010 0.000 0.011 91414 2022-07-24T07:41:50.816 0.005 0.000 -0.005 91429 2022-07-25T13:17:50.816 0.014 -0.000 -0.014 91446 2022-07-26T22:19:50.816 -0.009 -0.000 -0.004 91463 2022-07-28T09:20:50.816 -0.003 0.000 -0.003 91486 2022-07-30T05:58:50.816 0.003 0.000 -0.003 91510 2022-08-01T05:21:50.816 -0.006 -0.000 0.006 91525 2022-08-02T11:00:50.816 -0.001 0.000 0.001 91536 2022-08-03T08:36:50.816 0.001 -0.000 -0.001 91548 2022-08-04T09:18:50.816 0.002 0.000 0.002 91571 2022-08-06T05:55:50.816 -0.001 0.000 0.001 91585 2022-08-07T09:20:50.816 -0.001 0.000 0.001 91594 2022-08-08T04:43:50.816 0.008 0.000 0.004 91615 2022-08-09T20:51:50.816 -0.008 -0.000 0.009 91627 2022-08-10T20:07:50.816 0.001 0.000 -0.000 91636 2022-08-11T15:11:50.816 0.000 0.000 0.000 91659 2022-08-13T11:42:50.817 0.003 0.000 -0.002 91671 2022-08-14T11:30:50.817 0.002 -0.000 -0.003 91683 2022-08-15T11:14:50.817 -0.001 0.000 0.001 91707 2022-08-17T10:39:50.817 -0.005 0.000 0.005 91720 2022-08-18T13:10:50.817 0.005 -0.000 0.005 91742 2022-08-20T07:34:50.817 -0.008 -0.000 0.006 91756 2022-08-21T11:20:50.817 0.007 -0.000 -0.007 91774 2022-08-22T23:02:50.817 -0.001 -0.000 0.001 91789 2022-08-24T04:41:50.817 0.000 0.000 -0.000 91799 2022-08-25T01:17:50.817 -0.000 -0.000 -0.000 91812 2022-08-26T03:33:50.817 -0.000 0.000 -0.000 91826 2022-08-27T05:36:50.817 -0.000 -0.000 0.000 91839 2022-08-28T07:22:50.817 -0.002 -0.000 0.002 91863 2022-08-30T06:55:50.817 0.003 -0.000 -0.004 91873 2022-08-31T02:41:50.817 0.001 -0.000 -0.001 91890 2022-09-01T13:10:50.817 -0.002 -0.000 -0.002 91911 2022-09-03T05:46:50.817 -0.002 -0.000 0.002 91923 2022-09-04T05:05:50.817 -0.001 -0.000 0.001 91941 2022-09-05T16:36:50.817 0.003 0.000 -0.001 91959 2022-09-07T05:27:50.817 0.002 0.000 0.002 91980 2022-09-08T23:15:50.817 0.007 0.000 0.006 91997 2022-09-10T07:15:50.817 -0.003 -0.000 0.000 92011 2022-09-11T11:22:50.817 -0.001 -0.000 0.001 92023 2022-09-12T11:12:50.817 0.000 -0.000 -0.000 92034 2022-09-13T10:01:50.817 -0.001 0.000 -0.001 92044 2022-09-14T05:24:50.817 0.000 -0.000 0.000 92071 2022-09-16T09:53:50.817 -0.000 0.000 0.000 92084 2022-09-17T11:30:50.817 0.001 0.000 -0.001 92095 2022-09-18T10:45:50.817 -0.005 -0.000 -0.001 92115 2022-09-20T00:49:50.817 0.006 -0.000 -0.006 92129 2022-09-21T05:24:50.817 0.004 -0.000 0.003 92152 2022-09-23T03:05:50.817 0.002 0.000 0.002 92169 2022-09-24T11:21:50.817 -0.002 -0.000 0.001 92193 2022-09-26T11:01:50.817 0.000 0.000 -0.000 92205 2022-09-27T10:36:50.817 -0.003 0.000 0.002 92224 2022-09-29T01:05:50.817 0.007 -0.000 0.005 92238 2022-09-30T03:54:50.817 0.004 0.000 -0.003