2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Nov 14 12:58:09 PST 2007 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 24591 through 25707): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 JUL 01 00:01:05.184 2007 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_od24559-24626_rec_v1.bsp spk_m_od24625-24730_rec_v1.bsp spk_m_od24729-24803_rec_v1.bsp spk_m_od24801-24883_rec_v1.bsp spk_m_od24882-24978_rec_v1.bsp spk_m_od24977-25060_rec_v1.bsp spk_m_od25060-25153_rec_v1.bsp spk_m_od25152-25239_rec_v1.bsp spk_m_od25239-25310_rec_v1.bsp spk_m_od25309-25405_rec_v1.bsp spk_m_od25404-25495_rec_v1.bsp spk_m_od25493-25562_rec_v1.bsp spk_m_od25560-25651_rec_v1.bsp spk_m_od25650-25737_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_ext12.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 24604 2007-07-02T04:46:54.815 0.001 -0.000 0.001 24625 2007-07-03T22:38:54.815 0.000 0.000 0.000 24643 2007-07-05T09:48:54.815 -0.000 0.000 -0.000 24662 2007-07-06T23:22:54.816 0.005 0.000 0.009 24680 2007-07-08T11:08:54.816 0.000 0.000 0.000 24705 2007-07-10T12:18:54.816 -0.003 -0.000 -0.006 24729 2007-07-12T11:44:54.816 -0.000 -0.000 -0.001 24745 2007-07-13T19:23:54.816 -0.002 -0.000 -0.004 24763 2007-07-15T06:55:54.816 0.002 0.000 0.003 24780 2007-07-16T16:33:54.816 -0.000 -0.000 -0.001 24801 2007-07-18T10:03:54.816 -0.001 -0.000 -0.003 24817 2007-07-19T17:58:54.816 -0.004 -0.000 -0.006 24838 2007-07-21T11:08:54.816 0.001 0.000 0.002 24865 2007-07-23T15:03:54.816 0.001 -0.000 0.000 24882 2007-07-25T02:03:54.816 0.000 0.000 0.000 24903 2007-07-26T19:33:54.816 -0.000 -0.000 -0.000 24923 2007-07-28T11:04:54.816 -0.002 -0.000 -0.005 24945 2007-07-30T05:07:54.816 0.003 0.000 0.001 24959 2007-07-31T10:13:54.816 -0.004 -0.000 -0.009 24977 2007-08-01T21:45:54.816 0.004 -0.000 0.007 24995 2007-08-03T09:20:54.816 -0.001 -0.000 -0.001 25020 2007-08-05T10:43:54.816 0.000 0.000 0.001 25036 2007-08-06T18:18:54.816 -0.000 -0.000 -0.001 25060 2007-08-08T16:23:54.816 0.002 -0.000 0.000 25081 2007-08-10T11:13:54.816 0.000 -0.000 0.001 25107 2007-08-12T14:38:54.816 -0.000 -0.000 -0.001 25129 2007-08-14T10:06:54.817 0.001 -0.000 0.003 25152 2007-08-16T07:33:54.817 0.002 0.000 0.004 25178 2007-08-18T10:48:54.817 0.004 0.000 0.006 25201 2007-08-20T08:21:54.817 0.001 0.000 0.002 25224 2007-08-22T05:48:54.817 -0.002 -0.000 -0.004 25239 2007-08-23T11:26:54.817 0.001 0.000 0.003 25263 2007-08-25T10:52:54.817 0.000 -0.000 0.000 25287 2007-08-27T10:18:54.817 -0.001 -0.000 -0.002 25309 2007-08-29T05:50:54.817 0.000 -0.000 0.001 25332 2007-08-31T03:13:54.817 -0.000 0.000 -0.000 25359 2007-09-02T08:33:54.817 0.000 -0.000 0.001 25383 2007-09-04T07:58:54.817 -0.000 0.000 -0.001 25404 2007-09-06T01:29:54.817 0.002 0.000 0.004 25424 2007-09-07T16:58:54.817 0.001 0.000 0.001 25449 2007-09-09T18:23:54.817 0.001 0.000 0.001 25472 2007-09-11T15:50:54.817 -0.000 0.000 -0.000 25493 2007-09-13T09:19:54.817 -0.000 -0.000 -0.000 25504 2007-09-14T07:03:54.817 0.016 0.000 0.032 25508 2007-09-14T14:58:54.817 -0.005 0.000 -0.009 25524 2007-09-15T22:35:54.817 0.003 -0.001 0.006 25539 2007-09-17T04:13:54.817 -0.023 0.000 -0.042 25560 2007-09-18T22:16:54.817 0.014 0.000 0.005 25584 2007-09-20T21:08:54.817 0.001 0.000 0.002 25606 2007-09-22T16:38:54.817 -0.002 -0.000 -0.004 25628 2007-09-24T12:05:54.817 0.003 -0.000 0.006 25650 2007-09-26T06:13:54.817 -0.002 -0.000 0.000 25669 2007-09-27T21:13:54.817 -0.001 0.000 -0.003 25691 2007-09-29T16:33:54.817 0.001 0.000 0.002