2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Aug 18 14:41:29 PDT 2010 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 36796 through 37900): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2010 APR 01 00:01:06.185 2010 JUL 01 01:01:06.184 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_od36686-36800_rec_v1.bsp spk_m_od36798-36884_rec_v1.bsp spk_m_od36883-36970_rec_v1.bsp spk_m_od36955-37054_rec_v1.bsp spk_m_od37053-37129_rec_v1.bsp spk_m_od37128-37214_rec_v1.bsp spk_m_od37211-37304_rec_v1.bsp spk_m_od37303-37381_rec_v1.bsp spk_m_od37378-37474_rec_v1.bsp spk_m_od37473-37566_rec_v1.bsp spk_m_od37564-37648_rec_v1.bsp spk_m_od37647-37721_rec_v1.bsp spk_m_od37720-37810_rec_v1.bsp spk_m_od37808-37885_rec_v1.bsp spk_m_od37884-37976_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_ext23.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 36798 2010-04-01T05:18:53.814 0.048 0.001 -0.008 36809 2010-04-02T03:13:53.814 -0.001 0.000 0.000 36821 2010-04-03T02:53:53.814 -0.009 0.000 0.001 36833 2010-04-04T03:38:53.814 -0.044 -0.000 -0.002 36847 2010-04-05T06:58:53.814 -0.035 0.000 -0.007 36859 2010-04-06T06:43:53.814 -0.006 -0.000 -0.001 36871 2010-04-07T06:13:53.814 -0.009 -0.000 -0.002 36883 2010-04-08T05:28:53.814 -0.007 0.000 0.000 36897 2010-04-09T08:52:53.814 0.057 0.000 -0.011 36913 2010-04-10T17:38:53.814 0.011 0.000 0.001 36917 2010-04-11T01:43:53.814 0.006 0.000 -0.000 36930 2010-04-12T02:38:53.814 0.007 -0.000 0.001 36943 2010-04-13T04:43:53.814 -0.002 0.001 -0.000 36955 2010-04-14T04:48:53.814 -0.005 0.000 0.000 36963 2010-04-14T20:58:53.814 -0.002 0.000 0.001 36977 2010-04-15T23:58:53.814 -0.012 -0.000 -0.002 36988 2010-04-16T20:58:53.814 -0.005 0.000 0.000 37002 2010-04-18T00:28:53.814 -0.008 -0.000 0.001 37014 2010-04-19T00:13:53.814 -0.012 0.000 0.001 37027 2010-04-20T02:53:53.814 -0.043 0.000 -0.005 37041 2010-04-21T05:33:53.814 0.037 0.000 -0.005 37053 2010-04-22T05:48:53.814 -0.048 0.001 -0.013 37066 2010-04-23T08:38:53.814 0.000 0.000 0.000 37080 2010-04-24T10:33:53.814 -0.043 -0.000 0.008 37097 2010-04-25T20:41:53.814 0.054 -0.000 0.014 37114 2010-04-27T05:43:53.814 0.009 0.000 -0.002 37128 2010-04-28T09:58:53.814 0.002 -0.000 0.000 37146 2010-04-29T21:43:53.814 -0.022 0.000 -0.007 37158 2010-04-30T20:48:53.814 -0.005 0.000 0.000 37173 2010-05-02T03:29:53.814 -0.026 0.000 -0.001 37187 2010-05-03T07:23:53.814 0.004 0.000 -0.001 37199 2010-05-04T07:08:53.814 0.011 -0.000 -0.003 37211 2010-05-05T07:10:53.814 0.014 -0.000 -0.004 37224 2010-05-06T07:25:53.814 -0.020 -0.000 -0.002 37235 2010-05-07T04:48:53.814 0.002 0.000 -0.000 37245 2010-05-08T02:28:53.814 0.003 0.000 -0.001 37259 2010-05-09T04:28:53.814 0.006 -0.000 -0.000 37274 2010-05-10T10:08:53.814 -0.002 -0.000 0.000 37289 2010-05-11T16:08:53.814 0.008 0.000 0.003 37303 2010-05-12T21:03:53.814 0.001 0.000 -0.000 37319 2010-05-14T04:05:53.814 0.000 0.000 -0.000 37334 2010-05-15T08:28:53.814 -0.010 -0.000 0.003 37346 2010-05-16T08:13:53.814 -0.011 0.000 0.002 37365 2010-05-17T21:58:53.814 -0.008 0.000 0.000 37378 2010-05-19T00:32:53.814 -0.002 0.000 -0.000 37392 2010-05-20T03:08:53.814 -0.006 0.000 0.001 37407 2010-05-21T08:58:53.814 -0.006 0.000 -0.000 37418 2010-05-22T06:28:53.814 -0.017 0.000 0.004 37427 2010-05-23T00:18:53.814 0.012 0.000 -0.002 37441 2010-05-24T04:58:53.814 -0.015 0.000 -0.003 37456 2010-05-25T09:38:53.814 -0.004 0.000 0.001 37473 2010-05-26T20:43:53.814 0.011 -0.000 -0.004 37489 2010-05-28T04:28:53.815 -0.038 -0.000 0.015 37502 2010-05-29T04:48:53.815 0.055 0.000 0.008 37516 2010-05-30T08:54:53.815 -0.027 0.001 -0.011 37534 2010-05-31T20:33:53.815 0.027 -0.000 0.010 37547 2010-06-01T21:58:53.815 -0.004 0.000 -0.002 37564 2010-06-03T07:18:53.815 -0.002 0.000 -0.000 37575 2010-06-04T04:48:53.815 0.010 0.000 -0.002 37588 2010-06-05T08:13:53.815 -0.008 0.000 0.003 37594 2010-06-05T19:34:53.815 -0.009 0.000 0.001 37608 2010-06-06T21:58:53.815 -0.010 0.000 0.003 37621 2010-06-08T00:38:53.815 -0.007 0.000 -0.002 37635 2010-06-09T04:18:53.815 -0.024 0.000 -0.006 37647 2010-06-10T04:08:53.815 0.001 0.000 0.000 37662 2010-06-11T08:43:53.815 -0.013 -0.000 0.003 37674 2010-06-12T08:18:53.815 -0.001 0.000 0.000 37689 2010-06-13T14:28:53.815 -0.025 0.000 -0.007 37703 2010-06-14T19:25:53.815 0.015 0.000 -0.006 37714 2010-06-15T16:40:53.815 0.019 0.000 -0.001 37720 2010-06-16T04:10:53.815 0.023 -0.000 0.009 37732 2010-06-17T04:49:53.815 0.016 0.000 -0.007 37747 2010-06-18T08:33:53.815 0.006 0.000 -0.002 37763 2010-06-19T17:29:53.815 0.022 0.000 -0.001 37780 2010-06-21T02:24:53.815 -0.025 0.000 -0.009 37795 2010-06-22T09:18:53.815 0.024 -0.000 -0.010 37808 2010-06-23T09:08:53.815 0.008 0.000 -0.003 37825 2010-06-24T20:08:53.815 0.043 -0.000 -0.008 37838 2010-06-25T21:33:53.815 0.003 0.000 0.000 37853 2010-06-27T02:12:53.815 0.025 0.000 -0.005 37867 2010-06-28T06:56:53.815 -0.014 0.000 -0.001 37884 2010-06-29T16:54:53.815 -0.004 -0.000 0.001 37898 2010-06-30T19:19:53.815 -0.008 0.000 -0.000