2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, May 12, 2004 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): 2004 JAN 01 00:00:00.000 COVERAGE END TIME (TDB): 2004 APR 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_od09055-09174_rec_v1.bsp spk_m_od09175-09261_rec_v1.bsp spk_m_od09261-09343_rec_v1.bsp spk_m_od09343-09428_rec_v1.bsp spk_m_od09428-09496_rec_v1.bsp spk_m_od09495-09579_rec_v1.bsp spk_m_od09578-09664_rec_v1.bsp spk_m_od09663-09749_rec_v1.bsp spk_m_od09749-09826_rec_v1.bsp spk_m_od09826-09932_rec_v1.bsp spk_m_od09932-10018_rec_v1.bsp spk_m_od10018-10103_rec_v1.bsp spk_m_od10103-10186_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_map9.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 9090 2004-01-01T21:16:55.816 0.025 0.000 0.010 9113 2004-01-03T17:38:55.816 0.005 -0.000 -0.001 9136 2004-01-05T14:48:55.815 -0.001 -0.000 -0.000 9157 2004-01-07T09:38:55.815 -0.004 0.000 -0.002 9174 2004-01-08T18:28:55.815 0.005 -0.000 -0.003 9199 2004-01-10T19:48:55.815 -0.014 0.000 0.008 9222 2004-01-12T18:08:55.815 0.008 -0.000 0.004 9240 2004-01-14T05:40:55.815 -0.013 -0.000 -0.005 9260 2004-01-15T21:13:55.815 -0.012 -0.000 -0.005 9283 2004-01-17T18:38:55.815 -0.003 -0.000 -0.001 9307 2004-01-19T16:28:55.815 0.000 0.000 0.000 9323 2004-01-21T01:43:55.815 -0.013 -0.000 -0.006 9342 2004-01-22T15:17:55.815 0.012 0.000 0.005 9363 2004-01-24T07:02:55.815 -0.010 -0.000 -0.005 9385 2004-01-26T04:13:55.815 -0.013 0.000 -0.005 9407 2004-01-27T22:33:55.815 0.019 -0.000 -0.004 9427 2004-01-29T13:58:55.815 -0.018 -0.000 0.000 9450 2004-01-31T12:08:55.815 0.016 0.000 -0.006 9473 2004-02-02T08:58:55.815 -0.009 -0.000 0.002 9494 2004-02-04T03:38:55.815 -0.003 0.000 -0.001 9517 2004-02-06T01:08:55.815 0.001 0.000 0.000 9538 2004-02-07T18:33:55.815 -0.013 0.000 -0.004 9556 2004-02-09T04:58:55.815 0.025 0.000 -0.004 9577 2004-02-10T23:08:55.814 -0.002 -0.000 0.000 9600 2004-02-12T19:48:55.814 0.014 -0.000 -0.000 9619 2004-02-14T09:08:55.814 -0.026 0.000 -0.007 9642 2004-02-16T06:13:55.814 -0.003 0.000 -0.002 9662 2004-02-17T22:58:55.814 -0.004 -0.000 0.002 9681 2004-02-19T12:58:55.814 -0.025 -0.000 -0.004 9705 2004-02-21T11:58:55.814 0.013 -0.000 -0.004 9725 2004-02-23T03:58:55.814 0.013 0.000 0.003 9748 2004-02-25T00:15:55.814 0.001 0.000 0.000 9766 2004-02-26T12:53:55.814 -0.014 0.000 -0.001 9787 2004-02-28T05:43:55.814 0.002 0.000 -0.001 9806 2004-02-29T19:08:55.814 -0.006 0.000 0.002 9825 2004-03-02T08:58:55.814 0.022 -0.000 -0.007 9847 2004-03-04T03:58:55.814 0.016 -0.000 -0.002 9868 2004-03-05T21:28:55.814 0.007 -0.000 -0.001 9891 2004-03-07T19:16:55.814 -0.029 0.000 0.010 9909 2004-03-09T06:13:55.814 -0.016 0.000 -0.003 9931 2004-03-11T02:58:55.814 0.035 0.000 0.004 9951 2004-03-12T17:58:55.814 0.011 0.000 -0.003 9974 2004-03-14T16:03:55.814 0.006 0.000 0.001 9996 2004-03-16T10:23:55.814 0.034 -0.001 -0.003 10017 2004-03-18T04:58:55.814 -0.030 0.000 -0.005 10037 2004-03-19T19:58:55.814 -0.024 -0.000 0.005 10061 2004-03-21T18:28:55.814 0.034 0.000 0.006 10081 2004-03-23T10:08:55.814 -0.021 0.000 -0.002 10102 2004-03-25T03:58:55.814 -0.026 0.000 0.004 10125 2004-03-27T01:58:55.814 -0.015 0.000 0.002 10148 2004-03-28T23:43:55.814 0.054 0.000 0.003 10169 2004-03-30T15:53:55.814 -0.003 -0.000 -0.000