2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu May 8 09:50:49 PDT 2008 Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the 2001 Mars Odyssey (M01) spacecraft. The NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Extended Phase of the M01 mission (orbits 26825 through 27930): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2008 JAN 01 00:01:05.183 2008 APR 01 01:01:05.185 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the M01 NAV team during the Extended Phase of the mission. This file was created by NAIF for archiving in 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 by the M01 NAV team. The list of the original files data from which has been merged into this file is provided in 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 coverages immediately precede or follow it. The times and magnitudes of these discontinuities are provided in Appendix 2 of these comments. Usage -------------------------------------------------------- This file should be used together with DE405 planetary ephemeris and MAR063 satellite 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 Boris.Semenov@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_od26854-26940_rec_v1.bsp spk_m_od26939-27025_rec_v1.bsp spk_m_od27024-27097_rec_v1.bsp spk_m_od27096-27188_rec_v1.bsp spk_m_od27187-27279_rec_v1.bsp spk_m_od27277-27361_rec_v1.bsp spk_m_od27360-27450_rec_v1.bsp spk_m_od27449-27526_rec_v1.bsp spk_m_od27525-27614_rec_v1.bsp spk_m_od27613-27695_rec_v1.bsp spk_m_od27694-27786_rec_v1.bsp spk_m_od27786-27864_rec_v1.bsp spk_m_od27863-27948_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_ext14.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 26829 2008-01-01T09:28:54.816 0.034 0.000 0.008 26842 2008-01-02T10:33:54.816 -0.022 -0.000 0.004 26854 2008-01-03T09:53:54.816 -0.019 -0.000 0.004 26866 2008-01-04T09:13:54.815 -0.020 -0.001 -0.001 26877 2008-01-05T08:33:54.815 0.008 0.000 0.002 26890 2008-01-06T10:33:54.815 -0.046 0.000 -0.005 26903 2008-01-07T11:58:54.815 0.023 0.001 0.004 26914 2008-01-08T09:01:54.815 0.027 -0.000 -0.002 26926 2008-01-09T07:58:54.815 -0.095 -0.001 0.002 26939 2008-01-10T10:58:54.815 0.004 0.001 0.000 26952 2008-01-11T11:43:54.815 -0.052 0.001 0.007 26964 2008-01-12T11:38:54.815 0.076 -0.001 -0.010 26976 2008-01-13T11:38:54.815 -0.055 -0.001 0.004 26988 2008-01-14T10:28:54.815 -0.158 -0.001 -0.005 27001 2008-01-15T12:28:54.815 0.170 -0.002 -0.011 27011 2008-01-16T08:58:54.815 -0.149 0.002 0.004 27024 2008-01-17T11:18:54.815 -0.029 0.000 -0.003 27036 2008-01-18T10:33:54.815 -0.013 -0.001 -0.000 27053 2008-01-19T19:53:54.815 0.023 -0.001 -0.002 27064 2008-01-20T17:58:54.815 0.076 -0.001 0.000 27073 2008-01-21T11:48:54.815 0.067 -0.000 0.001 27084 2008-01-22T08:43:54.815 0.087 0.001 -0.005 27096 2008-01-23T08:08:54.815 0.005 0.001 0.000 27108 2008-01-24T08:53:54.815 -0.021 0.001 0.001 27121 2008-01-25T10:38:54.815 0.035 -0.000 -0.001 27134 2008-01-26T11:58:54.815 -0.095 0.000 0.010 27146 2008-01-27T11:58:54.815 0.057 0.001 -0.004 27159 2008-01-28T13:58:54.815 0.106 0.001 0.002 27174 2008-01-29T17:58:54.815 -0.113 -0.001 -0.013 27187 2008-01-30T19:48:54.815 0.049 0.001 0.007 27199 2008-01-31T20:18:54.815 -0.033 0.000 0.004 27214 2008-02-02T01:28:54.815 0.031 0.000 0.003 27226 2008-02-03T01:58:54.815 0.056 -0.000 -0.009 27237 2008-02-03T23:58:54.815 0.017 -0.000 -0.002 27250 2008-02-05T01:43:54.815 0.001 -0.001 -0.000 27264 2008-02-06T04:43:54.815 -0.019 0.000 0.002 27277 2008-02-07T05:58:54.815 0.023 -0.000 0.003 27289 2008-02-08T06:48:54.815 -0.001 0.000 0.000 27303 2008-02-09T10:24:54.815 0.005 -0.000 -0.001 27321 2008-02-10T21:03:54.814 0.036 -0.000 0.004 27334 2008-02-11T22:58:54.814 0.015 -0.000 -0.000 27347 2008-02-13T00:58:54.814 -0.027 0.000 0.005 27360 2008-02-14T02:58:54.814 0.009 0.000 -0.002 27373 2008-02-15T04:58:54.814 0.016 0.000 -0.001 27387 2008-02-16T06:58:54.814 -0.014 0.000 -0.002 27408 2008-02-18T01:58:54.814 -0.010 -0.000 0.002 27421 2008-02-19T03:58:54.814 -0.015 -0.000 -0.001 27435 2008-02-20T05:58:54.814 0.035 0.000 0.009 27449 2008-02-21T10:48:54.814 0.040 -0.000 -0.011 27467 2008-02-22T21:15:54.814 0.010 0.000 0.003 27488 2008-02-24T14:55:54.814 -0.013 -0.000 -0.004 27510 2008-02-26T10:58:54.814 0.011 0.000 -0.002 27525 2008-02-27T16:28:54.814 0.041 -0.001 -0.000 27542 2008-02-29T02:13:54.814 0.001 0.000 0.000 27553 2008-03-01T00:48:54.814 0.015 0.001 -0.000 27572 2008-03-02T13:05:54.814 0.041 0.000 0.010 27590 2008-03-04T00:53:54.814 -0.002 -0.000 -0.000 27613 2008-03-05T22:10:54.814 -0.007 -0.000 -0.002 27630 2008-03-07T08:25:54.814 0.003 -0.000 -0.001 27645 2008-03-08T14:23:54.814 -0.000 0.001 0.000 27661 2008-03-09T21:58:54.814 -0.040 -0.000 0.011 27678 2008-03-11T06:53:54.814 0.002 0.000 0.000 27694 2008-03-12T14:13:54.814 0.003 -0.000 0.001 27712 2008-03-14T02:48:54.814 0.002 -0.000 -0.000 27728 2008-03-15T08:58:54.814 0.007 0.000 0.002 27743 2008-03-16T15:13:54.814 -0.040 0.000 -0.005 27766 2008-03-18T12:31:54.814 -0.003 -0.000 -0.001 27786 2008-03-20T04:58:54.814 -0.003 0.000 0.001 27802 2008-03-21T11:07:54.814 -0.018 0.000 -0.003 27827 2008-03-23T12:43:54.814 -0.019 -0.000 -0.007 27846 2008-03-25T02:43:54.814 0.001 0.000 0.000 27863 2008-03-26T12:23:54.814 0.002 -0.000 0.000 27880 2008-03-27T22:23:54.814 0.012 -0.000 -0.004 27896 2008-03-29T05:08:54.814 -0.018 0.000 -0.008 27908 2008-03-30T04:52:54.814 0.012 0.000 0.005