2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, October 22, 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 JUL 01 00:00:00.000 COVERAGE END TIME (TDB): 2004 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_od11208-11297_rec_v1.bsp spk_m_od11378-11458_rec_v1.bsp spk_m_od11457-11547_rec_v1.bsp spk_m_od11545-11622_rec_v1.bsp spk_m_od11621-11722_rec_v1.bsp spk_m_od11721-11803_rec_v1.bsp spk_m_od11801-11889_rec_v1.bsp spk_m_od11888-11977_rec_v1.bsp spk_m_od11976-12063_rec_v1.bsp spk_m_od12039-12145_rec_v1.bsp spk_m_od12144-12214_rec_v1.bsp spk_m_od12212-12299_rec_v1.bsp spk_m_od12298-12383_rec_v1.bsp spk_m_od12383-12470_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_map11.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 11296 2004-07-01T11:38:55.815 -0.060 0.000 -0.012 11314 2004-07-02T23:23:55.815 0.024 -0.000 0.003 11336 2004-07-04T18:38:55.816 0.036 -0.000 0.008 11360 2004-07-06T17:08:55.816 0.021 0.000 -0.005 11378 2004-07-08T04:33:55.816 0.024 0.000 -0.006 11397 2004-07-09T18:03:55.816 -0.029 -0.000 0.008 11419 2004-07-11T15:23:55.816 -0.031 -0.000 0.008 11438 2004-07-13T04:38:55.816 -0.018 0.000 0.001 11457 2004-07-14T16:38:55.816 -0.011 -0.000 0.003 11480 2004-07-16T14:04:25.816 0.023 0.000 -0.007 11503 2004-07-18T13:18:55.816 0.072 0.000 -0.017 11525 2004-07-20T08:03:55.816 0.041 -0.001 0.013 11545 2004-07-21T23:38:55.816 -0.044 0.000 -0.013 11565 2004-07-23T14:23:55.816 -0.033 -0.000 0.006 11585 2004-07-25T05:48:55.816 -0.003 -0.000 0.001 11602 2004-07-26T15:08:55.816 -0.030 -0.000 0.010 11621 2004-07-28T06:08:55.816 -0.043 0.000 -0.004 11645 2004-07-30T05:18:55.816 -0.010 0.000 -0.003 11667 2004-08-01T00:13:55.816 0.030 -0.000 0.003 11685 2004-08-02T12:13:55.816 0.015 -0.000 0.005 11704 2004-08-04T01:13:55.816 0.013 0.000 -0.000 11721 2004-08-05T10:18:55.816 -0.009 -0.000 0.003 11741 2004-08-07T01:48:55.816 0.007 0.000 -0.003 11764 2004-08-09T00:48:55.816 0.051 0.001 -0.000 11781 2004-08-10T09:28:55.816 -0.034 -0.000 -0.002 11801 2004-08-12T02:13:55.817 0.060 0.001 -0.019 11820 2004-08-13T15:28:55.817 0.014 -0.001 0.000 11841 2004-08-15T07:43:55.817 -0.019 -0.000 0.006 11864 2004-08-17T05:28:55.817 -0.014 0.000 -0.001 11888 2004-08-19T04:58:55.817 0.006 0.000 0.001 11908 2004-08-20T20:08:55.817 0.030 -0.000 -0.009 11930 2004-08-22T15:18:55.817 0.003 -0.000 -0.001 11953 2004-08-24T12:43:55.817 0.007 0.000 -0.003 11976 2004-08-26T11:18:55.817 -0.077 0.001 -0.033 11997 2004-08-28T04:18:55.817 -0.074 0.000 -0.005 12020 2004-08-30T02:08:55.817 -0.026 0.000 -0.011 12039 2004-08-31T15:58:55.817 0.005 0.000 0.001 12062 2004-09-02T13:13:55.817 -0.056 0.001 -0.025 12083 2004-09-04T07:33:55.817 -0.051 -0.000 0.022 12105 2004-09-06T02:58:55.817 0.100 0.001 -0.038 12127 2004-09-07T22:18:55.817 -0.066 0.001 0.016 12144 2004-09-09T07:28:55.817 0.041 -0.001 0.013 12167 2004-09-11T03:48:55.817 -0.109 -0.001 0.049 12186 2004-09-12T17:38:55.817 0.160 -0.001 -0.027 12212 2004-09-14T22:28:55.817 -0.035 -0.000 0.015 12237 2004-09-16T22:38:55.817 -0.018 0.002 -0.004 12257 2004-09-18T15:18:55.817 0.067 0.003 -0.024 12279 2004-09-20T10:38:55.817 0.023 -0.003 -0.007 12298 2004-09-21T23:28:55.817 0.023 0.000 0.010 12318 2004-09-23T14:43:55.817 -0.015 0.000 -0.003 12339 2004-09-25T07:28:55.817 0.083 0.000 -0.037 12359 2004-09-26T23:08:55.817 -0.008 -0.000 0.004 12383 2004-09-28T23:08:55.817 -0.026 -0.001 -0.001 12405 2004-09-30T18:38:55.817 -0.010 -0.000 -0.001