2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, September 8, 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 APR 01 00:00:00.000 COVERAGE END TIME (TDB): 2003 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_od05685-05748_rec_v1.bsp spk_m_od05746-05855_rec_v1.bsp spk_m_od05855-05942_rec_v2.bsp spk_m_od05855_05942_rec_v1.bsp spk_m_od05941-06027_rec_v1.bsp spk_m_od06027-06107_rec_v1.bsp spk_m_od06107-06176_rec_v1.bsp spk_m_od06176-06278_rec_v1.bsp spk_m_od06276-06340_rec_v1.bsp spk_m_od06340-06453_rec_v1.bsp spk_m_od06453-06522_rec_v1.bsp spk_m_od06522-06607_rec_v1.bsp spk_m_od06603-06689_rec_v1.bsp spk_m_od06688-06774_rec_v1.bsp spk_m_od06773-06849_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_map6.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 5745 2003-04-01T12:43:55.814 0.000 0.000 0.000 5771 2003-04-03T15:58:55.814 0.001 -0.000 0.002 5791 2003-04-05T07:28:55.814 -0.001 -0.000 -0.002 5814 2003-04-07T04:30:55.814 -0.000 0.000 -0.000 5831 2003-04-08T14:20:55.814 0.001 0.000 0.001 5854 2003-04-10T11:43:55.814 -0.001 0.000 -0.001 5878 2003-04-12T11:13:55.814 -0.002 -0.000 -0.002 5902 2003-04-14T10:43:55.814 -0.002 -0.000 -0.003 5920 2003-04-15T22:28:55.814 0.002 0.000 0.003 5940 2003-04-17T13:43:55.814 -0.002 0.000 -0.002 5963 2003-04-19T11:13:55.814 -0.001 -0.000 -0.001 5978 2003-04-20T15:28:55.814 -0.001 -0.000 0.000 6002 2003-04-22T16:28:55.814 0.001 0.000 0.001 6026 2003-04-24T15:28:55.814 -0.003 0.000 -0.003 6046 2003-04-26T06:58:55.814 -0.004 0.000 -0.004 6069 2003-04-28T04:28:55.814 0.001 0.000 0.001 6091 2003-04-29T23:56:55.814 0.001 0.000 0.001 6106 2003-05-01T05:48:55.814 0.000 -0.000 0.001 6130 2003-05-03T05:13:55.814 0.001 0.000 0.001 6153 2003-05-05T02:28:55.814 -0.000 0.000 -0.000 6175 2003-05-06T21:53:55.814 -0.001 -0.000 -0.001 6196 2003-05-08T15:43:55.814 -0.000 -0.000 -0.001 6218 2003-05-10T11:08:55.814 -0.001 0.000 -0.001 6237 2003-05-12T00:28:55.814 -0.001 -0.000 -0.001 6260 2003-05-13T21:48:55.814 0.002 -0.000 0.002 6275 2003-05-15T03:38:55.814 -0.000 0.000 -0.001 6292 2003-05-16T13:08:55.814 -0.001 -0.000 -0.002 6316 2003-05-18T12:28:55.814 0.000 -0.000 0.000 6339 2003-05-20T08:58:55.814 -0.001 0.000 0.002 6362 2003-05-22T06:58:55.814 -0.001 -0.000 0.000 6385 2003-05-24T04:58:55.814 0.002 -0.000 0.003 6409 2003-05-26T03:58:55.814 -0.003 0.000 -0.001 6433 2003-05-28T03:28:55.814 0.001 -0.000 0.001 6452 2003-05-29T17:08:55.815 0.000 -0.000 0.000 6475 2003-05-31T14:48:55.815 -0.002 -0.000 -0.003 6497 2003-06-02T10:03:55.815 -0.002 0.000 -0.002 6521 2003-06-04T09:33:55.815 0.001 0.000 0.001 6544 2003-06-06T07:03:55.815 0.000 -0.000 0.000 6567 2003-06-08T04:20:55.815 0.002 0.000 0.002 6587 2003-06-09T19:52:55.815 0.001 0.000 0.001 6602 2003-06-11T01:28:55.815 -0.000 0.000 -0.000 6620 2003-06-12T13:08:55.815 -0.002 -0.000 -0.003 6644 2003-06-14T12:33:55.815 0.002 0.000 0.003 6666 2003-06-16T08:13:55.815 -0.001 0.000 -0.002 6687 2003-06-18T01:33:55.815 -0.001 0.000 -0.001 6711 2003-06-20T00:58:55.815 -0.001 0.000 -0.001 6736 2003-06-22T02:15:55.815 0.001 -0.000 0.002 6756 2003-06-23T17:45:55.815 0.003 -0.000 0.003 6772 2003-06-25T01:33:55.815 -0.003 0.000 -0.004 6789 2003-06-26T11:03:55.815 -0.001 -0.000 -0.001 6806 2003-06-27T20:38:55.815 -0.004 0.000 -0.005 6830 2003-06-29T19:58:55.815 0.002 0.000 0.002