2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Nov 7 10:05:20 PST 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 46780 through 47896): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2012 JUL 01 00:01:07.184 2012 OCT 01 01:01:07.182 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_od46745-46834_rec_v1.bsp spk_m_od46833-46900_rec_v1.bsp spk_m_od46898-47001_rec_v1.bsp spk_m_od46998-47089_rec_v1.bsp spk_m_od47088-47171_rec_v1.bsp spk_m_od47169-47256_rec_v1.bsp spk_m_od47254-47344_rec_v1.bsp spk_m_od47343-47425_rec_v1.bsp spk_m_od47424-47496_rec_v1.bsp spk_m_od47495-47591_rec_v1.bsp spk_m_od47590-47680_rec_v1.bsp spk_m_od47679-47765_rec_v1.bsp spk_m_od47763-47850_rec_v1.bsp spk_m_od47849-47931_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_ext32.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 46787 2012-07-01T17:35:52.815 0.005 0.000 -0.003 46801 2012-07-02T19:38:52.815 -0.000 0.000 0.000 46818 2012-07-04T05:13:57.815 -0.003 -0.000 0.001 46832 2012-07-05T09:18:52.816 0.001 -0.000 0.000 46849 2012-07-06T19:42:52.816 -0.001 0.000 0.000 46865 2012-07-08T03:39:52.816 -0.006 -0.000 0.003 46881 2012-07-09T09:53:52.816 -0.020 0.000 -0.000 46897 2012-07-10T17:40:52.816 0.015 -0.000 0.005 46906 2012-07-11T12:08:52.816 -0.010 0.000 -0.002 46911 2012-07-11T22:08:52.816 -0.072 -0.000 0.002 46913 2012-07-12T01:09:52.816 0.073 0.000 0.008 46915 2012-07-12T05:43:52.816 -0.037 0.000 -0.016 46920 2012-07-12T14:42:52.816 0.030 0.001 -0.011 46923 2012-07-12T22:04:52.816 -0.026 0.000 0.009 46939 2012-07-14T04:10:52.816 0.015 0.000 -0.006 46955 2012-07-15T11:58:52.816 0.019 0.000 -0.003 46966 2012-07-16T11:00:52.816 -0.003 0.000 0.001 46985 2012-07-17T23:58:52.816 -0.014 -0.000 -0.007 46997 2012-07-18T23:23:52.816 0.011 -0.000 0.005 47014 2012-07-20T08:28:52.816 -0.008 -0.000 0.002 47030 2012-07-21T16:17:52.816 -0.014 0.000 -0.000 47048 2012-07-23T03:54:52.816 0.014 -0.000 0.001 47066 2012-07-24T15:08:52.816 -0.014 0.000 0.006 47074 2012-07-25T07:42:42.816 0.019 -0.000 0.009 47087 2012-07-26T09:04:52.816 0.005 0.000 0.001 47103 2012-07-27T17:30:52.816 -0.012 -0.000 0.001 47120 2012-07-29T02:13:52.816 -0.006 -0.000 -0.002 47135 2012-07-30T07:52:52.816 -0.024 0.000 -0.006 47153 2012-07-31T19:03:52.816 0.019 0.000 -0.006 47168 2012-08-02T01:08:52.816 0.000 0.000 0.000 47188 2012-08-03T16:08:52.816 -0.016 -0.000 0.005 47206 2012-08-05T03:43:52.816 0.025 0.000 -0.008 47222 2012-08-06T11:18:52.816 -0.016 -0.001 0.005 47239 2012-08-07T21:37:52.816 0.020 -0.000 0.009 47253 2012-08-09T01:00:52.816 -0.014 -0.000 -0.005 47272 2012-08-10T15:36:52.816 0.009 -0.000 -0.003 47289 2012-08-12T00:19:52.817 -0.016 0.000 -0.007 47296 2012-08-12T15:16:52.817 0.001 0.000 -0.001 47311 2012-08-13T20:38:52.817 0.003 -0.000 -0.001 47327 2012-08-15T04:03:52.817 -0.018 0.000 0.003 47342 2012-08-16T09:23:52.817 0.028 -0.000 0.006 47360 2012-08-17T19:48:52.817 0.005 0.000 -0.002 47376 2012-08-19T03:53:52.817 0.004 0.000 0.001 47394 2012-08-20T16:30:52.817 0.017 0.000 -0.005 47410 2012-08-21T23:01:52.817 0.008 -0.000 0.001 47423 2012-08-23T00:56:52.817 -0.010 0.000 -0.004 47436 2012-08-24T03:25:52.817 -0.024 0.000 0.006 47439 2012-08-24T09:32:52.817 0.022 0.000 -0.008 47457 2012-08-25T20:03:52.817 -0.008 0.000 -0.003 47475 2012-08-27T08:33:52.817 0.006 -0.000 -0.002 47494 2012-08-28T20:58:52.817 -0.011 0.000 -0.002 47516 2012-08-30T17:53:52.817 -0.036 -0.000 0.012 47535 2012-09-01T06:38:52.817 0.036 -0.000 0.005 47554 2012-09-02T19:03:52.817 -0.061 -0.000 0.016 47570 2012-09-04T03:18:52.817 0.004 -0.000 0.001 47586 2012-09-05T11:13:52.817 -0.026 0.001 -0.007 47589 2012-09-05T16:53:52.817 0.058 0.000 0.019 47606 2012-09-07T03:08:52.817 0.033 -0.000 -0.005 47621 2012-09-08T07:28:52.817 -0.016 0.000 0.003 47638 2012-09-09T17:43:52.817 0.040 -0.000 0.013 47651 2012-09-10T19:33:52.817 -0.008 0.000 -0.002 47667 2012-09-12T03:13:52.817 0.013 -0.000 0.003 47678 2012-09-13T01:26:52.817 -0.035 -0.000 0.007 47686 2012-09-13T17:17:52.817 0.006 0.000 -0.001 47695 2012-09-14T11:08:52.817 -0.010 -0.000 0.003 47712 2012-09-15T19:19:52.817 0.025 0.000 -0.001 47715 2012-09-16T01:26:52.817 -0.004 0.000 -0.000 47724 2012-09-16T19:16:52.817 -0.037 -0.000 -0.006 47736 2012-09-17T19:13:52.817 -0.011 0.000 -0.003 47748 2012-09-18T18:58:52.817 0.032 -0.000 0.009 47762 2012-09-19T22:13:52.817 -0.002 -0.000 -0.000 47776 2012-09-21T02:43:52.817 -0.017 0.000 -0.001 47795 2012-09-22T15:13:52.817 0.016 0.000 -0.001 47810 2012-09-23T22:08:52.817 0.029 -0.000 -0.005 47825 2012-09-25T03:13:52.817 0.005 -0.000 0.001 47837 2012-09-26T02:48:52.817 0.017 0.000 0.004 47848 2012-09-27T00:17:52.817 -0.043 0.000 -0.008 47865 2012-09-28T10:01:52.817 0.037 -0.001 0.008 47882 2012-09-29T18:55:52.817 -0.040 -0.000 0.006 47894 2012-09-30T20:08:52.817 0.010 -0.000 -0.002