2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, December 3, 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 JUL 01 00:00:00.000 COVERAGE END TIME (TDB): 2002 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_od02381-02445_rec_v1.bsp spk_m_od02445-02538_rec_v1.bsp spk_m_od02539-02632_rec_v1.bsp spk_m_od02631-02708_rec_v1.bsp spk_m_od02708-02800_rec_v1.bsp spk_m_od02801-02875_rec_v1.bsp spk_m_od02875-02964_rec_v1.bsp spk_m_od02964-03055_rec_v1.bsp spk_m_od03056-03138_rec_v1.bsp spk_m_od03139-03233_rec_v1.bsp spk_m_od03233-03317_rec_v1.bsp spk_m_od03318-03387_rec_v1.bsp spk_m_od03387-03469_rec_v1.bsp spk_m_od03470-03543_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_map3.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 2428 2002-07-02T10:18:55.815 0.011 -0.001 -0.004 2444 2002-07-03T18:48:55.815 -0.007 0.000 -0.002 2468 2002-07-05T17:03:55.816 0.006 0.000 -0.001 2491 2002-07-07T15:18:55.816 0.007 0.000 -0.000 2513 2002-07-09T10:43:55.816 -0.003 0.000 0.001 2538 2002-07-11T11:58:55.816 0.000 0.000 0.001 2556 2002-07-12T22:58:55.816 -0.009 -0.000 0.003 2580 2002-07-14T23:13:55.816 -0.004 -0.000 -0.000 2606 2002-07-17T02:38:55.816 -0.001 0.001 -0.000 2630 2002-07-19T02:58:55.816 0.007 0.000 -0.000 2649 2002-07-20T15:58:55.816 0.063 0.000 0.033 2669 2002-07-22T07:38:55.816 0.020 -0.001 0.008 2686 2002-07-23T17:03:55.816 -0.063 -0.001 -0.033 2707 2002-07-25T11:08:55.816 -0.006 -0.001 0.001 2731 2002-07-27T09:28:55.816 0.001 -0.000 -0.001 2753 2002-07-29T04:58:55.816 -0.003 0.001 -0.001 2776 2002-07-31T02:28:55.816 -0.004 0.001 -0.002 2800 2002-08-02T00:58:55.816 -0.002 0.000 0.000 2820 2002-08-03T16:28:55.816 -0.003 -0.001 0.001 2838 2002-08-05T04:28:55.816 -0.017 -0.000 0.007 2857 2002-08-06T17:38:55.816 0.011 0.001 -0.002 2874 2002-08-08T04:08:55.816 0.022 -0.003 0.011 2916 2002-08-11T14:43:55.816 0.018 -0.001 -0.004 2939 2002-08-13T12:08:55.817 -0.000 0.001 -0.001 2964 2002-08-15T12:58:55.817 0.004 0.000 -0.003 2988 2002-08-17T13:18:55.817 0.019 0.000 0.006 3007 2002-08-19T02:48:55.817 -0.011 0.000 -0.003 3031 2002-08-21T02:38:55.817 0.008 -0.000 0.006 3055 2002-08-23T02:08:55.817 -0.015 -0.001 -0.007 3076 2002-08-24T19:38:55.817 -0.005 -0.000 -0.003 3097 2002-08-26T12:08:55.817 -0.005 0.001 0.002 3118 2002-08-28T05:23:55.817 0.001 0.000 -0.001 3138 2002-08-29T21:43:55.817 -0.004 -0.000 -0.001 3162 2002-08-31T21:28:55.817 0.004 -0.000 0.003 3184 2002-09-02T16:13:55.817 -0.004 0.001 0.003 3208 2002-09-04T15:38:55.817 0.001 0.000 0.000 3232 2002-09-06T15:18:55.817 0.018 -0.000 0.005 3255 2002-09-08T12:48:55.817 0.008 -0.000 0.003 3279 2002-09-10T12:18:55.817 -0.005 -0.000 -0.003 3299 2002-09-12T03:48:55.817 -0.004 0.000 -0.002 3317 2002-09-13T14:28:55.817 0.009 -0.000 -0.006 3335 2002-09-15T03:28:55.817 0.003 -0.000 0.001 3352 2002-09-16T11:38:55.817 0.006 0.000 -0.004 3365 2002-09-17T14:38:55.817 -0.004 -0.000 -0.003 3386 2002-09-19T08:28:55.817 0.001 0.000 -0.000 3407 2002-09-21T01:33:55.817 -0.012 0.000 -0.009 3432 2002-09-23T01:43:55.817 0.004 0.000 -0.008 3449 2002-09-24T12:08:55.817 -0.001 -0.000 -0.001 3469 2002-09-26T02:43:55.817 0.010 -0.000 -0.005 3487 2002-09-27T15:38:55.817 0.006 -0.000 0.004 3510 2002-09-29T11:43:55.817 0.006 0.000 -0.004