2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, September 19, 2002 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): 2002 APR 01 00:00:00.000 COVERAGE END TIME (TDB): 2002 JUL 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_od01267-01360_rec_v1.bsp spk_m_od01360-01446_rec_v1.bsp spk_m_od01446-01525_rec_v1.bsp spk_m_od01525-01616_rec_v1.bsp spk_m_od01616-01686_rec_v1.bsp spk_m_od01686-01776_rec_v1.bsp spk_m_od01777-01870_rec_v1.bsp spk_m_od01871-01959_rec_v1.bsp spk_m_od01959-02040_rec_v1.bsp spk_m_od02041-02121_rec_v1.bsp spk_m_od02120-02196_rec_v1.bsp spk_m_od02196-02286_rec_v1.bsp spk_m_od02287-02381_rec_v1.bsp spk_m_od02381-02445_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_map2.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 1314 2002-04-01T17:18:55.814 0.010 -0.000 0.001 1338 2002-04-03T17:48:55.814 -0.015 0.000 -0.001 1359 2002-04-05T11:58:55.814 0.009 -0.000 0.003 1378 2002-04-06T23:58:55.814 0.012 0.000 -0.003 1403 2002-04-09T01:58:55.814 0.005 -0.000 -0.001 1425 2002-04-10T21:28:55.814 -0.009 0.000 0.002 1446 2002-04-12T13:58:55.814 0.006 0.000 0.001 1466 2002-04-14T05:28:55.814 -0.001 -0.000 -0.000 1490 2002-04-16T05:28:55.814 0.003 -0.000 -0.001 1508 2002-04-17T17:58:55.814 0.001 0.000 0.000 1524 2002-04-19T01:28:55.814 -0.005 0.000 -0.001 1537 2002-04-20T03:28:55.814 -0.004 0.000 -0.002 1553 2002-04-21T10:58:55.814 0.008 -0.000 0.004 1556 2002-04-21T16:58:55.814 -0.005 -0.000 -0.003 1576 2002-04-23T07:18:55.814 0.001 -0.000 -0.001 1594 2002-04-24T19:58:55.814 -0.012 -0.000 -0.005 1615 2002-04-26T12:38:55.814 0.014 -0.000 -0.005 1638 2002-04-28T09:28:55.814 0.001 0.000 -0.000 1662 2002-04-30T08:48:55.814 0.006 0.000 0.000 1685 2002-05-02T07:58:55.814 -0.004 0.000 -0.001 1706 2002-05-04T01:28:55.814 -0.001 0.000 -0.000 1728 2002-05-05T20:18:55.814 0.001 -0.000 0.000 1753 2002-05-07T22:18:55.814 0.003 -0.000 0.001 1776 2002-05-09T18:43:55.814 0.001 -0.000 -0.001 1799 2002-05-11T16:53:55.814 -0.002 0.000 -0.001 1822 2002-05-13T14:43:55.814 0.003 0.000 0.001 1846 2002-05-15T13:58:55.814 0.004 -0.000 0.001 1870 2002-05-17T11:58:55.814 -0.003 -0.000 0.001 1893 2002-05-19T09:58:55.814 0.005 -0.000 -0.001 1919 2002-05-21T13:43:55.814 0.004 -0.000 0.001 1939 2002-05-23T05:43:55.814 -0.001 0.000 -0.000 1958 2002-05-24T18:43:55.814 -0.004 0.000 -0.001 1979 2002-05-26T11:43:55.814 0.006 -0.000 -0.002 2003 2002-05-28T11:43:55.815 -0.009 0.000 -0.003 2024 2002-05-30T05:43:55.815 -0.000 0.000 -0.000 2040 2002-05-31T12:43:55.815 0.003 0.000 0.001 2046 2002-05-31T23:58:55.815 0.000 0.000 0.000 2063 2002-06-02T10:43:55.815 -0.000 0.000 -0.000 2083 2002-06-04T01:18:55.815 0.009 0.000 -0.001 2097 2002-06-05T04:18:55.815 -0.001 0.001 0.000 2119 2002-06-07T01:28:55.815 -0.013 0.000 -0.001 2138 2002-06-08T14:58:55.815 -0.012 -0.000 -0.001 2155 2002-06-10T00:38:55.815 -0.003 -0.000 -0.000 2175 2002-06-11T16:08:55.815 -0.006 -0.000 -0.000 2195 2002-06-13T07:28:55.815 0.008 -0.000 0.002 2217 2002-06-15T01:28:55.815 -0.002 -0.000 0.001 2240 2002-06-16T23:28:55.815 0.002 -0.000 -0.000 2261 2002-06-18T17:28:55.815 0.003 0.000 0.001 2286 2002-06-20T17:33:55.815 -0.006 -0.000 0.001 2309 2002-06-22T15:28:55.815 -0.016 0.000 0.006 2333 2002-06-24T14:28:55.815 0.026 -0.000 -0.004 2357 2002-06-26T14:38:55.815 0.006 -0.000 0.000 2380 2002-06-28T12:58:55.815 0.002 0.000 0.000