2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Sun Jul 29 08:17:16 PDT 2012 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 45675 through 46779): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2012 APR 01 00:01:06.185 2012 JUL 01 01:01:07.184 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_od45720-45808_rec_v1.bsp spk_m_od45806-45892_rec_v1.bsp spk_m_od45889-45982_rec_v1.bsp spk_m_od45981-46063_rec_v1.bsp spk_m_od46062-46149_rec_v1.bsp spk_m_od46147-46226_rec_v1.bsp spk_m_od46224-46325_rec_v1.bsp spk_m_od46323-46405_rec_v1.bsp spk_m_od46404-46492_rec_v1.bsp spk_m_od46489-46559_rec_v1.bsp spk_m_od46558-46663_rec_v1.bsp spk_m_od46661-46746_rec_v1.bsp spk_m_od46745-46834_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_ext31.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 45675 2012-04-01T01:33:53.814 0.008 -0.000 -0.002 45692 2012-04-02T11:08:53.814 -0.037 -0.000 0.008 45709 2012-04-03T21:51:53.814 0.033 -0.000 0.001 45720 2012-04-04T19:20:53.814 -0.051 0.000 -0.013 45737 2012-04-06T04:08:53.814 0.024 0.000 -0.001 45747 2012-04-06T23:52:53.814 -0.028 0.000 0.002 45757 2012-04-07T19:37:53.814 0.043 -0.000 -0.003 45762 2012-04-08T05:30:53.814 -0.015 -0.000 0.001 45778 2012-04-09T12:43:53.814 0.004 0.000 -0.001 45794 2012-04-10T20:33:53.814 -0.018 -0.001 0.004 45806 2012-04-11T21:08:53.814 0.020 -0.000 0.005 45821 2012-04-13T01:53:53.814 -0.015 -0.000 0.003 45836 2012-04-14T07:32:48.814 -0.024 -0.000 0.004 45847 2012-04-15T05:14:48.814 0.036 -0.000 -0.007 45859 2012-04-16T04:58:53.814 -0.010 -0.000 0.001 45875 2012-04-17T12:39:53.814 -0.055 0.000 0.003 45889 2012-04-18T17:00:53.814 -0.003 -0.000 -0.001 45905 2012-04-19T23:53:53.814 0.012 0.000 -0.001 45918 2012-04-21T01:17:53.814 -0.017 -0.000 0.006 45936 2012-04-22T13:07:53.814 0.004 0.000 -0.000 45948 2012-04-23T12:50:53.814 0.019 0.000 -0.001 45964 2012-04-24T20:18:53.814 -0.026 -0.000 0.006 45981 2012-04-26T06:53:53.814 -0.008 -0.000 -0.002 45995 2012-04-27T09:33:53.814 0.002 -0.000 -0.000 46007 2012-04-28T09:21:53.814 0.008 0.000 -0.001 46019 2012-04-29T09:03:53.814 0.002 -0.000 0.000 46036 2012-04-30T18:29:53.814 -0.004 0.000 0.001 46049 2012-05-01T21:38:53.814 -0.023 -0.000 0.008 46062 2012-05-02T22:43:53.814 0.045 -0.000 0.016 46079 2012-05-04T09:03:53.814 0.016 0.000 -0.007 46098 2012-05-05T20:58:53.814 0.014 0.000 -0.003 46115 2012-05-07T07:03:53.814 -0.035 0.000 -0.014 46130 2012-05-08T12:08:53.814 -0.001 0.000 0.000 46147 2012-05-09T22:38:53.814 0.007 0.000 0.002 46166 2012-05-11T11:25:53.814 -0.017 -0.000 0.001 46182 2012-05-12T19:01:53.814 -0.020 -0.000 0.002 46197 2012-05-14T00:39:53.814 0.043 0.000 -0.003 46214 2012-05-15T10:03:53.814 -0.021 -0.000 0.007 46224 2012-05-16T07:31:48.814 0.030 0.000 -0.015 46239 2012-05-17T11:30:08.814 0.004 0.000 -0.001 46257 2012-05-19T00:38:53.814 0.007 0.000 -0.003 46273 2012-05-20T06:38:53.814 -0.012 0.000 0.004 46288 2012-05-21T12:25:53.814 -0.004 0.000 0.000 46306 2012-05-22T23:58:53.814 -0.004 0.000 0.000 46323 2012-05-24T10:09:53.814 -0.013 0.000 -0.006 46342 2012-05-25T23:10:53.814 0.014 0.000 0.001 46356 2012-05-27T03:22:53.814 -0.018 0.000 -0.009 46373 2012-05-28T12:24:53.815 0.007 -0.000 0.000 46390 2012-05-29T23:03:53.815 -0.003 0.000 0.000 46404 2012-05-31T01:56:53.815 0.024 0.000 0.011 46424 2012-06-01T17:09:53.815 0.019 -0.000 0.001 46440 2012-06-03T00:46:53.815 -0.003 0.000 -0.000 46455 2012-06-04T07:19:53.815 0.006 0.000 0.000 46476 2012-06-05T23:38:53.815 0.004 -0.000 -0.001 46489 2012-06-07T02:48:53.815 0.022 -0.000 -0.009 46500 2012-06-08T00:33:53.815 0.096 0.004 -0.054 46512 2012-06-08T22:48:53.815 -0.017 0.000 0.004 46524 2012-06-09T23:40:53.815 -0.057 0.000 0.002 46535 2012-06-10T21:28:53.815 0.047 -0.000 -0.007 46547 2012-06-11T20:08:53.815 -0.031 -0.001 -0.002 46558 2012-06-12T18:51:53.815 0.010 -0.000 -0.001 46571 2012-06-13T19:32:53.815 -0.008 -0.000 -0.004 46584 2012-06-14T22:08:53.815 -0.021 -0.000 -0.001 46596 2012-06-15T22:28:53.815 0.007 -0.000 -0.004 46614 2012-06-17T08:29:53.815 0.012 0.000 0.001 46627 2012-06-18T10:10:53.815 0.002 -0.000 0.000 46645 2012-06-19T21:33:53.815 -0.037 -0.001 0.009 46661 2012-06-21T05:31:53.815 -0.003 0.000 -0.001 46676 2012-06-22T12:33:53.815 -0.021 0.000 0.010 46693 2012-06-23T20:33:53.815 0.009 -0.000 0.000 46710 2012-06-25T07:14:53.815 -0.011 -0.000 0.003 46730 2012-06-26T22:38:53.815 -0.003 0.000 0.000 46745 2012-06-28T04:41:53.815 0.017 0.000 -0.009 46763 2012-06-29T16:11:53.815 -0.005 -0.000 0.002 46779 2012-06-30T23:58:53.815 0.019 0.000 -0.010