2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri May 21 09:49:37 PDT 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 35703 through 36795): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2010 JAN 01 00:01:06.183 2010 APR 01 01:01:06.185 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_od35693-35763_rec_v1.bsp spk_m_od35761-35867_rec_v1.bsp spk_m_od35866-35942_rec_v1.bsp spk_m_od35940-36030_rec_v1.bsp spk_m_od36029-36120_rec_v1.bsp spk_m_od36119-36200_rec_v1.bsp spk_m_od36199-36282_rec_v1.bsp spk_m_od36281-36376_rec_v1.bsp spk_m_od36374-36461_rec_v1.bsp spk_m_od36460-36527_rec_v1.bsp spk_m_od36527-36625_rec_v1.bsp spk_m_od36624-36687_rec_v1.bsp spk_m_od36686-36800_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_ext22.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 35713 2010-01-01T21:08:53.816 0.001 0.000 -0.001 35732 2010-01-03T12:26:53.816 -0.003 0.000 -0.002 35746 2010-01-04T14:38:53.815 0.002 0.000 -0.005 35761 2010-01-05T21:25:53.815 -0.001 0.000 -0.001 35776 2010-01-07T03:04:53.815 -0.001 -0.000 -0.001 35789 2010-01-08T04:46:53.815 0.000 -0.000 0.001 35805 2010-01-09T12:24:53.815 0.002 -0.000 0.002 35820 2010-01-10T18:02:53.815 -0.002 0.000 -0.002 35836 2010-01-12T01:38:53.815 0.001 -0.000 0.002 35852 2010-01-13T09:18:53.815 0.005 0.000 0.006 35866 2010-01-14T12:58:53.815 -0.013 -0.000 -0.015 35882 2010-01-15T20:33:53.815 0.000 0.000 -0.000 35903 2010-01-17T14:03:53.815 -0.000 -0.000 -0.000 35922 2010-01-19T03:38:53.815 -0.001 -0.000 -0.001 35940 2010-01-20T15:08:53.815 -0.005 -0.000 -0.006 35958 2010-01-22T02:43:53.815 0.006 0.000 0.006 35976 2010-01-23T14:18:53.815 0.002 0.000 0.002 35994 2010-01-25T01:47:53.815 -0.006 -0.000 -0.005 36011 2010-01-26T11:24:53.815 -0.003 -0.000 -0.003 36029 2010-01-27T22:56:53.815 0.000 -0.000 0.000 36045 2010-01-29T06:32:53.815 -0.005 -0.000 -0.004 36057 2010-01-30T06:14:53.815 0.003 -0.000 0.002 36069 2010-01-31T05:56:53.815 -0.007 -0.000 -0.005 36083 2010-02-01T09:38:53.815 0.005 -0.000 0.003 36101 2010-02-02T21:08:53.815 -0.010 0.000 -0.007 36119 2010-02-04T07:38:53.815 -0.009 0.000 0.005 36137 2010-02-05T20:13:53.815 -0.003 -0.000 -0.002 36154 2010-02-07T05:53:53.815 -0.002 -0.000 -0.001 36168 2010-02-08T09:21:53.815 -0.006 -0.000 -0.002 36184 2010-02-09T17:28:53.814 0.009 0.000 0.004 36199 2010-02-10T22:33:53.814 0.001 0.000 0.000 36217 2010-02-12T10:03:53.814 -0.007 0.000 -0.002 36234 2010-02-13T20:24:53.814 -0.001 -0.000 -0.000 36240 2010-02-14T08:28:53.814 0.022 0.001 -0.004 36249 2010-02-15T01:58:53.814 -0.032 0.000 -0.008 36259 2010-02-15T20:28:53.814 0.017 0.000 -0.008 36266 2010-02-16T10:58:53.814 0.001 -0.000 0.000 36281 2010-02-17T16:43:53.814 0.000 0.000 0.000 36300 2010-02-19T05:18:53.814 -0.001 0.000 0.000 36318 2010-02-20T18:38:53.814 -0.031 -0.000 0.005 36335 2010-02-22T02:18:53.814 0.047 0.000 -0.010 36350 2010-02-23T08:58:53.814 0.005 -0.000 0.002 36360 2010-02-24T03:43:53.814 -0.018 -0.000 0.004 36368 2010-02-24T19:33:53.814 0.015 0.000 -0.003 36374 2010-02-25T08:31:53.814 -0.015 0.000 -0.004 36390 2010-02-26T16:27:53.814 0.012 -0.000 0.002 36396 2010-02-27T03:47:53.814 -0.031 -0.000 -0.005 36406 2010-02-27T23:38:53.814 0.017 -0.001 0.004 36410 2010-02-28T07:38:53.814 0.049 -0.000 0.012 36427 2010-03-01T17:33:53.814 -0.024 -0.000 -0.005 36443 2010-03-03T01:38:53.814 -0.028 -0.000 0.004 36460 2010-03-04T10:23:53.814 -0.035 -0.000 -0.008 36476 2010-03-05T18:43:53.814 0.010 -0.000 -0.001 36494 2010-03-07T04:39:53.814 0.011 -0.000 -0.002 36509 2010-03-08T11:56:53.814 0.001 0.000 -0.000 36527 2010-03-09T22:48:53.814 -0.016 -0.000 -0.003 36539 2010-03-10T22:39:53.814 0.014 -0.000 0.002 36555 2010-03-12T05:03:53.814 -0.019 -0.000 0.003 36567 2010-03-13T04:50:53.814 -0.012 -0.000 0.002 36579 2010-03-14T04:38:53.814 -0.001 0.000 0.000 36592 2010-03-15T06:33:53.814 -0.011 -0.000 0.001 36609 2010-03-16T16:58:53.814 -0.037 -0.000 -0.005 36624 2010-03-17T23:08:53.814 -0.066 -0.001 0.008 36641 2010-03-19T08:18:53.814 -0.035 0.000 -0.003 36653 2010-03-20T07:43:53.814 0.103 -0.001 0.018 36665 2010-03-21T06:30:53.814 -0.009 -0.000 0.002 36674 2010-03-22T00:18:53.814 -0.010 -0.000 0.002 36677 2010-03-22T07:08:53.814 0.007 0.000 0.001 36686 2010-03-22T23:58:53.814 0.073 0.001 -0.012 36698 2010-03-24T00:34:53.814 -0.039 0.000 -0.007 36707 2010-03-24T17:37:53.814 0.009 -0.000 -0.001 36714 2010-03-25T08:29:53.814 -0.016 0.000 -0.001 36722 2010-03-25T23:58:53.814 0.005 -0.000 0.001 36735 2010-03-27T00:59:53.814 -0.057 -0.001 0.005 36742 2010-03-27T15:55:53.814 0.046 0.000 0.001 36752 2010-03-28T11:03:53.814 -0.085 0.000 -0.014 36762 2010-03-29T07:38:53.814 -0.066 -0.001 0.006 36774 2010-03-30T06:53:53.814 0.017 -0.000 0.002 36786 2010-03-31T07:13:53.814 -0.020 -0.000 0.003