2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 19 17:04:55 PST 2019 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 74506 through 75622): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2018 OCT 01 00:01:09.182 2019 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: spk_m_od74545-74620_rec_v1.bsp spk_m_od74613-74707_rec_v1.bsp spk_m_od74706-74792_rec_v1.bsp spk_m_od74791-74885_rec_v1.bsp spk_m_od74883-74973_rec_v1.bsp spk_m_od74973-75058_rec_v1.bsp spk_m_od75057-75228_rec_v1.bsp spk_m_od75227-75313_rec_v1.bsp spk_m_od75312-75394_rec_v1.bsp spk_m_od75394-75479_rec_v1.bsp spk_m_od75479-75564_rec_v1.bsp spk_m_od75564-75645_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_ext57.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 74521 2018-10-02T07:18:50.817 0.002 -0.000 0.002 74533 2018-10-03T07:11:50.817 0.000 0.000 0.000 74545 2018-10-04T06:27:50.817 -0.000 0.000 -0.001 74576 2018-10-06T20:09:50.817 -0.001 -0.000 -0.001 74589 2018-10-07T22:28:50.817 -0.000 -0.000 0.000 74599 2018-10-08T18:14:50.817 -0.001 -0.000 0.001 74613 2018-10-09T20:52:50.817 -0.001 0.000 -0.001 74640 2018-10-12T02:43:50.817 -0.000 -0.000 0.000 74654 2018-10-13T06:57:50.817 -0.003 0.000 0.005 74666 2018-10-14T06:39:50.817 -0.001 -0.000 0.001 74678 2018-10-15T06:22:50.817 0.006 -0.000 -0.008 74695 2018-10-16T15:22:50.817 -0.004 -0.000 -0.003 74706 2018-10-17T13:12:50.817 -0.000 0.000 -0.000 74726 2018-10-19T04:29:50.817 0.000 -0.000 0.000 74739 2018-10-20T06:52:50.817 0.001 -0.000 -0.002 74755 2018-10-21T14:21:50.817 -0.000 -0.000 0.000 74763 2018-10-22T06:21:50.817 0.001 -0.000 -0.002 74775 2018-10-23T06:06:50.817 -0.001 -0.000 0.002 74791 2018-10-24T12:43:50.817 -0.003 0.000 -0.004 74816 2018-10-26T14:37:50.817 0.000 0.000 0.000 74839 2018-10-28T12:32:50.817 -0.001 0.000 0.001 74863 2018-10-30T11:34:50.817 -0.002 -0.000 -0.001 74883 2018-11-01T03:08:50.817 0.004 0.000 0.001 74909 2018-11-03T06:50:50.817 0.001 -0.000 -0.002 74933 2018-11-05T06:20:50.817 0.001 -0.000 -0.002 74944 2018-11-06T04:08:50.817 -0.003 -0.000 0.005 74963 2018-11-07T17:43:50.817 0.001 0.000 -0.001 74973 2018-11-08T12:34:50.817 0.001 0.000 0.000 74998 2018-11-10T14:10:50.817 0.004 0.000 0.005 75009 2018-11-11T12:38:50.817 -0.000 0.000 0.001 75033 2018-11-13T11:35:50.817 0.002 -0.000 0.001 75048 2018-11-14T17:44:50.817 -0.000 -0.000 0.000 75057 2018-11-15T10:37:50.817 0.018 -0.009 0.006 75079 2018-11-17T06:37:50.817 -0.007 -0.000 0.001 75091 2018-11-18T06:35:50.817 -0.000 0.000 0.000 75105 2018-11-19T10:18:50.817 -0.016 0.000 0.020 75127 2018-11-21T05:45:50.817 -0.003 0.000 0.003 75147 2018-11-22T20:57:50.817 -0.002 0.000 -0.000 75160 2018-11-23T22:30:50.817 0.002 0.000 0.002 75167 2018-11-24T12:55:50.817 0.003 0.000 -0.005 75175 2018-11-25T04:13:50.817 -0.002 0.000 -0.001 75188 2018-11-26T06:27:50.817 -0.003 0.000 0.004 75204 2018-11-27T13:15:50.817 0.005 0.000 0.006 75227 2018-11-29T10:30:50.816 -0.007 -0.000 -0.009 75240 2018-11-30T12:40:50.816 -0.005 0.000 -0.003 75264 2018-12-02T12:40:50.816 0.005 0.000 -0.008 75297 2018-12-05T05:55:50.816 -0.003 -0.000 0.004 75312 2018-12-06T11:01:50.816 0.002 -0.000 0.001 75325 2018-12-07T12:41:50.816 0.004 0.000 0.002 75337 2018-12-08T12:57:50.816 -0.002 0.000 0.002 75349 2018-12-09T12:41:50.816 0.000 0.000 -0.000 75370 2018-12-11T05:38:50.816 -0.005 0.000 -0.003 75382 2018-12-12T05:54:50.816 0.001 0.000 -0.002 75394 2018-12-13T04:37:50.816 -0.001 -0.000 -0.002 75410 2018-12-14T12:42:50.816 -0.007 0.000 -0.004 75438 2018-12-16T20:37:50.816 0.010 -0.000 -0.014 75455 2018-12-18T05:39:50.816 0.000 -0.000 -0.000 75467 2018-12-19T05:56:50.816 -0.002 -0.000 0.002 75479 2018-12-20T04:35:50.816 -0.001 -0.000 -0.001 75495 2018-12-21T12:33:50.816 0.002 0.000 0.002 75503 2018-12-22T05:03:50.816 -0.002 0.000 0.002 75519 2018-12-23T12:33:50.816 -0.007 0.000 0.007 75528 2018-12-24T06:04:50.816 0.005 -0.000 -0.001 75552 2018-12-26T05:54:50.816 0.003 -0.000 -0.004 75564 2018-12-27T04:34:50.816 -0.003 -0.000 -0.003 75587 2018-12-29T03:07:50.816 -0.005 0.000 0.006 75600 2018-12-30T04:12:50.816 0.006 0.000 0.003