2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon May 3 13:27:47 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 84500 through 85593): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2021 JAN 01 00:01:09.183 2021 APR 01 01:01:09.185 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_od84478-84579_rec_v1.bsp spk_m_od84578-84660_rec_v1.bsp spk_m_od84659-84746_rec_v1.bsp spk_m_od84745-84833_rec_v1.bsp spk_m_od84832-84904_rec_v1.bsp spk_m_od84903-84996_rec_v1.bsp spk_m_od84995-85086_rec_v1.bsp spk_m_od85085-85171_rec_v1.bsp spk_m_od85170-85255_rec_v1.bsp spk_m_od85253-85337_rec_v1.bsp spk_m_od85336-85410_rec_v1.bsp spk_m_od85409-85504_rec_v1.bsp spk_m_od85503-85601_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_ext66.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 84515 2021-01-02T06:58:50.816 -0.011 0.000 0.010 84530 2021-01-03T12:36:50.815 0.002 -0.000 -0.002 84548 2021-01-05T00:10:50.815 0.004 0.000 -0.003 84564 2021-01-06T07:48:50.815 0.003 0.000 -0.003 84578 2021-01-07T11:15:50.815 -0.013 0.000 0.010 84591 2021-01-08T12:59:50.815 -0.006 0.000 0.005 84603 2021-01-09T12:10:50.815 0.001 -0.000 0.000 84634 2021-01-12T02:04:50.815 0.001 -0.000 -0.001 84648 2021-01-13T05:02:50.815 0.001 -0.000 0.001 84659 2021-01-14T02:21:50.815 0.000 -0.000 0.000 84687 2021-01-16T10:50:50.815 0.006 -0.000 -0.005 84698 2021-01-17T07:44:50.815 -0.002 0.000 -0.001 84711 2021-01-18T09:22:50.815 -0.002 0.000 -0.002 84723 2021-01-19T10:02:50.815 -0.002 -0.000 0.002 84745 2021-01-21T04:41:50.815 -0.007 -0.000 -0.004 84761 2021-01-22T12:13:50.815 -0.003 0.000 -0.002 84779 2021-01-24T00:08:50.815 -0.009 0.000 -0.000 84795 2021-01-25T08:18:50.815 0.008 -0.000 -0.007 84815 2021-01-26T23:48:50.815 -0.007 -0.000 0.006 84832 2021-01-28T08:12:50.815 0.003 0.000 0.002 84851 2021-01-29T22:59:50.815 -0.001 -0.000 0.001 84865 2021-01-31T02:38:50.815 0.006 -0.000 -0.005 84876 2021-01-31T23:57:50.815 0.000 0.000 -0.000 84894 2021-02-02T11:45:50.815 -0.008 -0.000 0.006 84903 2021-02-03T04:31:50.815 0.006 0.000 0.004 84923 2021-02-04T21:15:50.815 0.004 -0.000 -0.004 84935 2021-02-05T20:48:50.815 -0.005 0.000 0.004 84964 2021-02-08T06:12:50.815 0.011 -0.000 -0.009 84984 2021-02-09T21:17:50.814 -0.005 -0.000 0.000 84995 2021-02-10T18:32:50.814 0.000 0.000 0.000 85019 2021-02-12T18:53:50.814 0.016 -0.000 -0.013 85031 2021-02-13T18:27:50.814 -0.011 0.000 0.008 85058 2021-02-15T23:41:50.814 0.006 -0.000 -0.003 85085 2021-02-18T04:49:50.814 0.000 -0.000 0.000 85098 2021-02-19T06:57:50.814 -0.008 0.000 0.006 85118 2021-02-20T22:39:50.814 0.009 0.000 -0.007 85131 2021-02-21T23:31:50.814 0.001 0.000 0.001 85153 2021-02-23T19:48:50.814 -0.003 0.000 0.002 85170 2021-02-25T04:24:50.814 0.002 -0.000 0.002 85183 2021-02-26T06:50:50.814 -0.004 -0.000 0.003 85195 2021-02-27T05:55:50.814 0.001 -0.000 0.001 85216 2021-02-28T23:22:50.814 0.002 -0.000 0.002 85228 2021-03-01T23:25:50.814 -0.006 0.000 -0.001 85240 2021-03-02T23:26:50.814 0.013 -0.000 -0.008 85253 2021-03-04T00:52:50.814 -0.003 0.000 -0.000 85270 2021-03-05T10:40:50.814 -0.000 0.000 -0.000 85288 2021-03-06T22:38:50.814 0.003 0.000 -0.002 85301 2021-03-08T00:11:50.814 -0.003 0.000 0.002 85313 2021-03-08T23:15:50.814 -0.000 0.000 -0.000 85325 2021-03-09T23:09:50.814 0.001 -0.000 0.000 85336 2021-03-10T20:13:50.814 -0.002 0.000 -0.002 85355 2021-03-12T10:24:50.814 -0.002 -0.000 -0.000 85373 2021-03-13T22:36:50.814 0.004 -0.000 -0.003 85379 2021-03-14T10:19:50.814 0.003 -0.000 -0.003 85409 2021-03-16T20:29:50.814 -0.005 0.000 -0.003 85434 2021-03-18T23:05:50.814 -0.010 0.000 0.007 85450 2021-03-20T05:58:50.814 0.003 0.000 0.002 85472 2021-03-22T01:26:50.814 -0.004 0.000 -0.002 85483 2021-03-22T22:58:50.814 0.003 -0.000 0.003 85503 2021-03-24T14:14:50.814 -0.002 -0.000 -0.001 85523 2021-03-26T06:48:50.814 0.004 0.000 -0.003 85537 2021-03-27T09:58:50.814 -0.003 -0.000 -0.001 85553 2021-03-28T18:08:50.814 -0.000 0.000 0.000 85573 2021-03-30T09:43:50.814 -0.003 -0.000 0.002 85585 2021-03-31T09:36:50.814 0.001 -0.000 -0.001