2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Dec 10 08:56:10 PST 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 29036 through 30152): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2008 JUL 01 00:01:05.184 2008 OCT 01 01:01:05.182 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_od29035-29132_rec_v1.bsp spk_m_od29132-29219_rec_v1.bsp spk_m_od29219-29319_rec_v1.bsp spk_m_od29318-29403_rec_v1.bsp spk_m_od29402-29482_rec_v1.bsp spk_m_od29480-29559_rec_v1.bsp spk_m_od29557-29637_rec_v1.bsp spk_m_od29636-29715_rec_v1.bsp spk_m_od29714-29827_rec_v1.bsp spk_m_od29825-29919_rec_v1.bsp spk_m_od29918-30000_rec_v1.bsp spk_m_od29999-30080_rec_v1.bsp spk_m_od30078-30140_rec_v1.bsp spk_m_od30138-30253_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_ext16.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 29036 2008-07-01T00:03:54.815 0.010 0.000 0.003 29054 2008-07-02T13:38:54.815 0.008 0.000 0.003 29073 2008-07-04T03:13:54.815 0.004 -0.000 0.002 29092 2008-07-05T16:48:54.816 -0.003 0.000 -0.002 29110 2008-07-07T04:19:54.816 -0.011 -0.000 -0.004 29132 2008-07-08T23:46:54.816 -0.003 0.000 -0.001 29154 2008-07-10T19:15:54.816 -0.015 -0.000 -0.005 29176 2008-07-12T14:43:54.816 0.001 -0.000 0.000 29197 2008-07-14T08:18:54.816 -0.016 -0.000 -0.007 29219 2008-07-16T03:43:54.816 -0.001 -0.000 -0.000 29240 2008-07-17T21:13:54.816 0.003 -0.000 0.001 29261 2008-07-19T14:48:54.816 -0.002 -0.000 -0.001 29279 2008-07-21T02:23:54.816 0.003 0.000 0.001 29298 2008-07-22T15:58:54.816 0.002 -0.000 0.001 29318 2008-07-24T07:23:54.816 -0.021 -0.000 -0.007 29340 2008-07-26T02:51:54.816 -0.000 -0.000 -0.000 29362 2008-07-27T22:18:54.816 -0.013 -0.000 -0.003 29382 2008-07-29T13:53:54.816 -0.021 0.000 -0.007 29402 2008-07-31T05:23:54.816 0.001 -0.000 0.000 29419 2008-08-01T14:59:54.816 -0.001 -0.000 -0.000 29442 2008-08-03T12:28:54.816 0.001 0.000 0.000 29461 2008-08-05T02:03:54.816 -0.001 0.000 -0.000 29480 2008-08-06T15:33:54.816 -0.002 -0.000 -0.001 29499 2008-08-08T05:08:54.816 -0.000 0.000 -0.000 29518 2008-08-09T18:43:54.816 -0.005 0.000 -0.002 29539 2008-08-11T12:08:54.816 -0.005 0.000 -0.001 29557 2008-08-12T23:48:54.817 -0.007 0.000 -0.003 29577 2008-08-14T15:23:54.817 -0.006 0.000 -0.003 29596 2008-08-16T04:53:54.817 -0.006 0.000 -0.003 29616 2008-08-17T20:23:54.817 0.003 -0.000 0.001 29636 2008-08-19T11:58:54.817 -0.009 0.000 -0.004 29654 2008-08-20T23:38:54.817 -0.006 -0.000 -0.003 29675 2008-08-22T17:23:54.817 0.001 -0.000 0.001 29696 2008-08-24T10:33:54.817 0.014 -0.000 0.006 29714 2008-08-25T21:59:54.817 -0.001 0.000 -0.000 29737 2008-08-27T19:26:54.817 -0.001 0.000 -0.000 29761 2008-08-29T18:51:54.817 -0.001 0.000 -0.000 29785 2008-08-31T18:18:54.817 0.007 -0.000 0.001 29801 2008-09-02T03:03:54.817 -0.032 -0.000 0.012 29825 2008-09-04T02:33:54.817 0.030 -0.000 -0.012 29846 2008-09-05T18:53:54.817 0.021 -0.000 0.005 29869 2008-09-07T16:56:54.817 -0.002 -0.000 -0.000 29894 2008-09-09T17:30:54.817 -0.006 -0.000 0.001 29918 2008-09-11T16:53:54.817 0.017 -0.000 -0.004 29938 2008-09-13T09:28:54.817 -0.050 0.000 -0.006 29963 2008-09-15T10:00:54.817 0.055 0.000 0.002 29980 2008-09-16T19:36:54.817 0.004 0.000 0.000 29999 2008-09-18T09:22:54.817 -0.001 -0.000 -0.000 30018 2008-09-19T22:43:54.817 0.022 0.000 0.001 30039 2008-09-21T17:13:54.817 -0.031 0.000 0.002 30063 2008-09-23T17:08:54.817 0.003 0.000 -0.001 30078 2008-09-24T21:18:54.817 0.030 -0.000 0.001 30100 2008-09-26T17:38:54.817 -0.013 -0.000 -0.002 30117 2008-09-28T02:22:54.817 0.007 0.000 0.000 30138 2008-09-29T20:43:54.817 -0.011 -0.000 -0.001 30148 2008-09-30T16:42:54.817 0.004 -0.000 -0.001 30150 2008-09-30T19:54:54.817 -0.003 -0.000 -0.001