2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Mar 12 10:52:36 PDT 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 25708 through 26824): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 OCT 01 00:01:05.182 2008 JAN 01 01:01:05.183 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_od25736-25833_rec_v1.bsp spk_m_od25832-25918_rec_v1.bsp spk_m_od25916-26002_rec_v1.bsp spk_m_od26000-26089_rec_v1.bsp spk_m_od26087-26170_rec_v1.bsp spk_m_od26168-26257_rec_v1.bsp spk_m_od26256-26325_rec_v1.bsp spk_m_od26324-26427_rec_v1.bsp spk_m_od26426-26499_rec_v1.bsp spk_m_od26498-26584_rec_v1.bsp spk_m_od26583-26674_rec_v1.bsp spk_m_od26672-26747_rec_v1.bsp spk_m_od26744-26855_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_ext13.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 25715 2007-10-01T15:58:54.817 -0.000 -0.000 -0.000 25736 2007-10-03T09:33:54.817 0.001 0.000 0.001 25760 2007-10-05T07:40:54.817 -0.001 -0.000 0.001 25784 2007-10-07T07:05:54.817 0.001 0.000 -0.000 25809 2007-10-09T09:43:54.817 0.000 0.000 0.000 25832 2007-10-11T05:57:54.817 -0.002 -0.000 0.002 25847 2007-10-12T13:14:54.817 -0.001 0.000 -0.001 25868 2007-10-14T06:23:54.817 0.000 0.000 0.000 25893 2007-10-16T07:43:54.817 0.001 0.000 0.001 25916 2007-10-18T05:13:54.817 0.000 0.000 0.000 25941 2007-10-20T06:33:54.817 0.001 0.000 0.001 25964 2007-10-22T04:02:54.817 -0.001 -0.000 -0.002 25979 2007-10-23T09:43:54.817 -0.001 0.000 -0.001 26000 2007-10-25T03:09:54.817 0.001 -0.000 0.002 26022 2007-10-26T22:37:54.817 0.003 -0.000 0.005 26036 2007-10-28T02:17:54.817 -0.000 -0.000 -0.001 26062 2007-10-30T05:40:54.817 0.002 0.000 0.003 26087 2007-11-01T07:07:54.817 -0.000 0.000 -0.001 26111 2007-11-03T06:27:54.817 -0.000 -0.000 -0.001 26135 2007-11-05T05:57:54.817 0.002 0.000 0.002 26152 2007-11-06T15:30:54.817 -0.000 -0.000 0.000 26168 2007-11-07T23:08:54.817 0.003 -0.000 0.003 26188 2007-11-09T14:58:54.817 0.002 0.000 0.002 26208 2007-11-11T06:13:54.817 -0.002 -0.000 -0.002 26233 2007-11-13T07:33:54.817 -0.001 -0.000 -0.001 26256 2007-11-15T05:03:54.817 -0.001 -0.000 -0.001 26280 2007-11-17T04:28:54.817 -0.001 -0.000 -0.001 26304 2007-11-19T03:53:54.817 -0.001 -0.000 -0.001 26324 2007-11-20T18:08:54.817 -0.000 -0.000 0.000 26345 2007-11-22T12:54:54.817 -0.003 -0.000 -0.003 26365 2007-11-24T04:23:54.817 -0.001 -0.000 -0.001 26384 2007-11-25T17:58:54.817 -0.000 0.000 -0.000 26408 2007-11-27T17:28:54.817 -0.000 -0.000 -0.000 26426 2007-11-29T04:58:54.816 0.000 0.000 0.000 26450 2007-12-01T04:23:54.816 0.002 -0.000 0.002 26462 2007-12-02T04:26:54.816 0.003 0.000 0.003 26476 2007-12-03T06:36:54.816 0.001 -0.000 -0.000 26498 2007-12-05T03:13:54.816 -0.000 -0.000 -0.000 26516 2007-12-06T13:38:54.816 0.000 -0.000 -0.000 26540 2007-12-08T13:05:54.816 -0.008 -0.000 0.002 26559 2007-12-10T03:53:54.816 -0.001 -0.000 -0.001 26583 2007-12-12T03:08:54.816 0.002 0.000 0.001 26601 2007-12-13T14:44:54.816 -0.004 0.000 -0.002 26624 2007-12-15T12:08:54.816 0.005 -0.000 0.002 26648 2007-12-17T11:33:54.816 -0.003 -0.000 -0.001 26672 2007-12-19T11:13:54.816 -0.015 -0.000 -0.007 26692 2007-12-21T02:51:54.816 0.011 -0.000 0.005 26710 2007-12-22T14:04:54.816 -0.026 0.000 -0.006 26722 2007-12-23T12:40:54.816 0.021 -0.001 0.000 26728 2007-12-24T00:58:54.816 0.007 0.000 -0.002 26744 2007-12-25T10:01:54.816 -0.004 -0.001 -0.001 26756 2007-12-26T07:55:54.816 -0.004 -0.000 -0.000 26771 2007-12-27T14:06:54.816 -0.006 -0.000 0.001 26789 2007-12-29T02:56:54.816 0.033 0.000 0.004 26801 2007-12-30T01:53:54.816 -0.046 0.003 -0.004 26813 2007-12-31T01:28:54.816 0.028 -0.001 -0.001