2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 16 08:58:15 PST 2010 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 34585 through 35702): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2009 OCT 01 00:01:06.182 2010 JAN 01 01:01:06.183 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_od34589-34667_rec_v1.bsp spk_m_od34665-34751_rec_v1.bsp spk_m_od34749-34846_rec_v1.bsp spk_m_od34844-34919_rec_v1.bsp spk_m_od34917-35014_rec_v1.bsp spk_m_od35012-35102_rec_v1.bsp spk_m_od35100-35186_rec_v1.bsp spk_m_od35184-35259_rec_v1.bsp spk_m_od35257-35333_rec_v1.bsp spk_m_od35332-35442_rec_v1.bsp spk_m_od35441-35522_rec_v1.bsp spk_m_od35520-35599_rec_v1.bsp spk_m_od35596-35695_rec_v1.bsp spk_m_od35693-35763_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_ext21.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 34589 2009-10-01T09:53:53.817 -0.001 0.000 -0.003 34609 2009-10-03T01:23:53.817 0.001 -0.000 0.002 34629 2009-10-04T16:53:53.817 -0.001 -0.000 -0.005 34637 2009-10-05T08:42:53.817 0.001 -0.000 0.004 34653 2009-10-06T16:18:53.817 0.000 -0.000 0.002 34665 2009-10-07T15:58:53.817 -0.000 -0.000 -0.002 34676 2009-10-08T13:42:53.817 -0.001 0.000 -0.004 34693 2009-10-09T23:19:53.817 -0.001 -0.000 -0.002 34704 2009-10-10T21:01:53.817 0.002 0.000 0.007 34721 2009-10-12T06:38:53.817 -0.001 -0.000 -0.006 34737 2009-10-13T14:13:53.817 -0.001 0.000 -0.003 34749 2009-10-14T13:57:53.817 0.001 -0.000 0.005 34760 2009-10-15T11:43:53.817 0.000 -0.000 0.001 34774 2009-10-16T15:23:53.817 0.001 0.000 0.003 34793 2009-10-18T04:53:53.817 -0.001 -0.000 -0.006 34809 2009-10-19T12:21:53.817 0.000 -0.000 0.004 34829 2009-10-21T04:03:53.817 0.002 0.000 0.006 34844 2009-10-22T09:43:53.817 -0.001 0.000 -0.003 34860 2009-10-23T17:18:53.817 -0.000 -0.000 -0.000 34876 2009-10-25T00:53:53.817 -0.002 -0.000 -0.010 34893 2009-10-26T10:28:53.817 0.001 -0.000 0.004 34905 2009-10-27T10:10:53.817 -0.001 -0.000 -0.003 34917 2009-10-28T09:53:53.817 0.002 -0.000 0.011 34930 2009-10-29T11:38:53.817 0.002 -0.000 0.007 34945 2009-10-30T17:13:53.817 -0.001 -0.000 -0.004 34964 2009-11-01T06:48:53.817 0.001 0.000 0.004 34982 2009-11-02T18:18:53.817 0.002 0.000 0.005 34993 2009-11-03T16:02:53.817 -0.000 -0.000 -0.001 35012 2009-11-05T05:38:53.817 -0.000 0.000 -0.002 35029 2009-11-06T15:13:53.817 0.001 -0.000 0.002 35045 2009-11-07T22:48:53.817 0.000 0.000 0.001 35065 2009-11-09T14:17:53.817 -0.002 0.000 -0.007 35082 2009-11-11T00:08:53.817 -0.002 -0.000 0.000 35100 2009-11-12T11:26:53.817 0.001 -0.000 0.004 35113 2009-11-13T13:07:53.817 0.002 0.000 0.007 35133 2009-11-15T04:38:53.817 -0.002 -0.000 -0.009 35150 2009-11-16T14:18:53.817 -0.000 -0.000 -0.001 35169 2009-11-18T03:43:53.817 0.003 0.000 0.008 35184 2009-11-19T09:28:53.817 -0.000 -0.000 -0.001 35204 2009-11-21T00:58:53.817 0.001 -0.000 0.003 35224 2009-11-22T16:27:53.817 -0.002 0.000 -0.007 35245 2009-11-24T09:56:53.817 0.001 0.000 0.003 35257 2009-11-25T09:38:53.817 -0.000 -0.000 -0.000 35269 2009-11-26T09:23:53.817 -0.000 -0.000 -0.000 35285 2009-11-27T16:56:53.816 0.002 0.000 0.004 35296 2009-11-28T14:41:53.816 -0.003 -0.000 -0.007 35311 2009-11-29T19:48:53.816 -0.020 -0.064 -0.139 35313 2009-11-30T00:03:53.816 0.006 -0.000 0.024 35323 2009-11-30T19:48:53.816 0.030 -0.000 0.108 35332 2009-12-01T13:33:53.816 -0.023 -0.000 -0.080 35343 2009-12-02T11:33:53.816 -0.004 -0.000 -0.011 35355 2009-12-03T11:18:53.816 -0.007 -0.000 -0.016 35373 2009-12-04T23:03:53.816 -0.000 -0.000 0.001 35393 2009-12-06T14:19:53.816 0.003 0.000 0.007 35410 2009-12-07T23:54:53.816 -0.000 -0.000 -0.000 35426 2009-12-09T07:31:53.816 0.002 0.000 0.004 35441 2009-12-10T13:12:53.816 0.000 0.000 -0.000 35456 2009-12-11T18:50:53.816 0.004 0.000 0.009 35473 2009-12-13T04:26:53.816 -0.002 0.000 -0.005 35489 2009-12-14T12:08:53.816 -0.000 0.000 -0.000 35502 2009-12-15T13:58:53.816 -0.001 0.000 -0.001 35520 2009-12-17T01:33:53.816 0.003 0.000 0.001 35536 2009-12-18T09:08:53.816 0.003 -0.000 0.002 35550 2009-12-19T12:51:23.816 -0.002 -0.000 -0.001 35568 2009-12-21T00:23:53.816 -0.001 -0.000 0.000 35585 2009-12-22T09:57:53.816 0.002 -0.000 0.002 35596 2009-12-23T07:41:53.816 0.001 0.000 0.001 35605 2009-12-24T01:29:53.816 -0.001 0.000 -0.000 35624 2009-12-25T15:01:53.816 -0.001 -0.000 0.001 35637 2009-12-26T16:44:53.816 0.001 0.000 0.000 35645 2009-12-27T08:33:53.816 0.006 0.000 0.003 35661 2009-12-28T16:13:53.816 -0.004 0.000 -0.001 35680 2009-12-30T05:43:53.816 0.002 0.000 0.001 35693 2009-12-31T07:23:53.816 0.001 0.000 0.000