2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, November 9, 2003 Objects in the Ephemeris -------------------------------------------------------- This file contains ephemeris data for 2001 Mars Odyssey (M01) spacecraft. NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Mapping phase of the M01 mission: COVERAGE BEGIN TIME (TDB): 2003 JUL 01 00:00:00.000 COVERAGE END TIME (TDB): 2003 OCT 01 01:00:00.000 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by M01 NAV during Mapping phase of the mission. The file was created by NAIF for archiving with 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 (FIS/DOM) by M01 NAV. The list of the original files data from which has been merged into this file is provided in the 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 coverage immediately precede and follow it. The times and magnitudes of these discontinuities are provided in the Appendix 2 of these comments. Usage -------------------------------------------------------- This file should be used together with DE405 planetary 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, bsemenov@spice.jpl.nasa.gov or M01 NAV Team Lead: Robert A. Mase (818)-354-8990 Robert.A.Mase@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_od06773-06849_rec_v1.bsp spk_m_od06849-06952_rec_v1.bsp spk_m_od06951-07042_rec_v1.bsp spk_m_od07041-07118_rec_v1.bsp spk_m_od07118-07209_rec_v1.bsp spk_m_od07209-07288_rec_v1.bsp spk_m_od07288-07374_rec_v1.bsp spk_m_od07373-07465_rec_v1.bsp spk_m_od07465-07549_rec_v1.bsp spk_m_od07548-07635_rec_v1.bsp spk_m_od07635-07717_rec_v1.bsp spk_m_od07716-07795_rec_v1.bsp spk_m_od07795-07864_rec_v1.bsp spk_m_od07864-07971_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_map7.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 6848 2003-07-01T07:33:55.815 -0.002 -0.000 -0.002 6873 2003-07-03T08:58:55.815 -0.001 -0.000 -0.001 6898 2003-07-05T10:23:55.816 0.004 0.000 0.005 6911 2003-07-06T12:03:55.816 -0.001 -0.000 -0.001 6927 2003-07-07T19:43:55.816 0.001 0.000 0.001 6950 2003-07-09T17:28:55.816 -0.005 0.000 -0.004 6968 2003-07-11T04:58:55.816 -0.003 -0.000 -0.003 6983 2003-07-12T08:58:55.816 0.004 0.000 -0.001 7000 2003-07-13T19:54:55.816 -0.006 -0.000 -0.007 7023 2003-07-15T17:19:55.816 0.001 -0.000 0.001 7040 2003-07-17T02:48:55.816 -0.001 -0.000 -0.001 7060 2003-07-18T18:18:55.816 -0.011 -0.000 -0.009 7084 2003-07-20T17:43:55.816 0.004 -0.000 0.003 7117 2003-07-23T10:58:55.816 0.010 -0.000 0.009 7139 2003-07-25T06:28:55.816 0.000 0.000 0.000 7162 2003-07-27T03:53:55.816 0.006 0.000 0.005 7185 2003-07-29T00:23:55.816 -0.009 0.000 0.007 7208 2003-07-30T22:49:55.816 -0.006 0.000 -0.005 7225 2003-08-01T08:24:55.816 0.001 -0.000 0.001 7247 2003-08-03T03:48:55.816 -0.020 -0.000 -0.014 7267 2003-08-04T19:18:55.816 0.004 0.000 0.002 7287 2003-08-06T10:50:55.816 -0.008 0.000 -0.005 7309 2003-08-08T05:20:55.816 -0.045 0.000 0.030 7333 2003-08-10T05:48:55.816 0.008 0.000 0.005 7351 2003-08-11T17:18:55.816 0.006 -0.000 0.004 7372 2003-08-13T10:58:55.817 -0.007 -0.000 -0.005 7395 2003-08-15T08:13:55.817 -0.002 0.000 -0.001 7416 2003-08-17T01:43:55.817 0.015 -0.000 0.008 7440 2003-08-19T01:08:55.817 -0.011 -0.000 -0.005 7464 2003-08-21T00:28:55.817 -0.019 -0.000 -0.007 7484 2003-08-22T16:28:55.817 0.014 0.000 0.007 7505 2003-08-24T09:28:55.817 0.009 0.000 0.003 7524 2003-08-25T22:58:55.817 -0.003 -0.000 -0.001 7547 2003-08-27T20:58:55.817 0.026 0.000 0.011 7568 2003-08-29T13:58:55.817 0.013 -0.000 0.003 7588 2003-08-31T05:30:55.817 0.027 0.000 0.007 7611 2003-09-02T02:13:55.817 -0.009 0.000 0.004 7634 2003-09-04T00:18:55.817 -0.021 -0.000 -0.002 7654 2003-09-05T14:38:55.817 0.021 0.000 0.004 7676 2003-09-07T09:58:55.817 -0.006 -0.000 -0.002 7698 2003-09-09T06:53:55.817 -0.024 -0.000 -0.005 7715 2003-09-10T16:43:55.817 -0.061 -0.001 -0.024 7738 2003-09-12T13:58:55.817 -0.007 0.000 -0.002 7757 2003-09-14T03:08:55.817 0.023 -0.000 -0.005 7775 2003-09-15T14:23:55.817 0.023 0.000 -0.009 7794 2003-09-17T04:28:55.817 0.031 0.000 0.001 7818 2003-09-19T02:28:55.817 -0.015 0.000 -0.006 7840 2003-09-20T23:23:55.817 -0.018 -0.000 -0.000 7863 2003-09-22T19:58:55.817 -0.023 0.000 0.004 7883 2003-09-24T11:28:55.817 0.008 -0.001 -0.001 7902 2003-09-26T00:28:55.817 0.022 -0.001 0.010 7925 2003-09-27T21:58:55.817 0.015 0.000 0.006 7947 2003-09-29T17:58:55.817 -0.008 0.000 0.002