2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Jul 29 10:11:18 PDT 2014 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 54544 through 55649): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2014 APR 01 00:01:07.185 2014 JUL 01 01:01:07.184 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_od54463-54551_rec_v1.bsp spk_m_od54549-54635_rec_v1.bsp spk_m_od54634-54707_rec_v1.bsp spk_m_od54705-54824_rec_v1.bsp spk_m_od54822-54908_rec_v1.bsp spk_m_od54906-54982_rec_v1.bsp spk_m_od54980-55074_rec_v1.bsp spk_m_od55072-55152_rec_v1.bsp spk_m_od55150-55237_rec_v1.bsp spk_m_od55234-55323_rec_v1.bsp spk_m_od55322-55406_rec_v1.bsp spk_m_od55405-55494_rec_v1.bsp spk_m_od55492-55584_rec_v1.bsp spk_m_od55583-55677_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_ext39.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 54548 2014-04-01T08:33:52.814 -0.018 -0.000 0.006 54563 2014-04-02T15:28:52.814 0.043 -0.000 0.003 54581 2014-04-04T01:32:52.814 -0.043 -0.001 0.016 54599 2014-04-05T14:43:52.814 0.026 0.000 -0.004 54613 2014-04-06T17:02:35.814 0.034 0.001 -0.008 54633 2014-04-08T09:03:52.814 -0.040 0.001 -0.012 54654 2014-04-10T03:03:52.814 0.003 -0.000 0.000 54672 2014-04-11T14:48:52.814 -0.040 -0.000 0.005 54690 2014-04-13T02:38:47.814 -0.009 0.000 0.003 54704 2014-04-14T04:58:52.814 0.005 -0.000 0.000 54725 2014-04-15T23:43:52.814 -0.005 -0.000 0.002 54742 2014-04-17T08:28:52.814 0.003 -0.000 0.001 54761 2014-04-18T22:53:52.814 0.042 0.000 -0.015 54774 2014-04-19T22:43:52.814 -0.007 0.000 0.002 54792 2014-04-21T11:28:13.814 0.002 0.000 0.000 54804 2014-04-22T11:28:45.814 0.017 -0.000 -0.004 54821 2014-04-23T19:48:52.814 0.009 0.000 -0.000 54840 2014-04-25T10:33:52.814 -0.032 -0.000 0.009 54856 2014-04-26T17:53:52.814 -0.025 -0.000 -0.001 54872 2014-04-28T00:34:14.814 0.012 -0.000 0.001 54889 2014-04-29T10:54:00.814 0.010 -0.000 0.003 54905 2014-04-30T17:48:35.814 0.021 0.000 0.004 54920 2014-05-01T23:06:30.814 -0.008 0.000 0.002 54933 2014-05-03T01:41:13.814 0.014 0.000 0.005 54945 2014-05-04T02:07:18.814 -0.004 -0.000 0.002 54962 2014-05-05T11:48:52.814 -0.001 -0.000 0.000 54979 2014-05-06T20:01:52.814 0.007 0.000 0.002 54998 2014-05-08T09:08:52.814 -0.007 0.000 0.002 55016 2014-05-09T20:38:52.814 0.019 0.000 -0.007 55034 2014-05-11T08:10:52.814 -0.014 -0.000 0.006 55045 2014-05-12T07:28:26.814 0.000 0.000 -0.000 55056 2014-05-13T04:20:01.814 0.009 0.000 0.005 55071 2014-05-14T10:23:53.814 -0.003 0.000 -0.001 55090 2014-05-16T00:41:18.814 -0.005 -0.000 0.003 55105 2014-05-17T06:17:45.814 0.010 0.000 -0.006 55118 2014-05-18T07:28:50.814 -0.011 0.000 0.004 55136 2014-05-19T19:28:52.814 -0.007 -0.000 0.005 55149 2014-05-20T19:52:03.814 0.010 0.000 0.006 55167 2014-05-22T08:41:22.814 -0.002 -0.000 0.001 55181 2014-05-23T12:20:13.814 -0.003 -0.000 0.002 55200 2014-05-25T01:23:34.814 0.007 -0.000 -0.002 55217 2014-05-26T11:24:52.814 -0.008 -0.000 0.006 55233 2014-05-27T18:28:52.814 0.005 -0.000 -0.001 55254 2014-05-29T12:28:52.815 0.002 0.000 -0.001 55272 2014-05-31T00:01:52.815 0.006 0.000 -0.005 55287 2014-06-01T05:38:17.815 -0.004 0.000 0.004 55308 2014-06-02T22:51:37.815 0.006 -0.000 -0.004 55321 2014-06-03T23:33:52.815 -0.007 -0.000 -0.005 55340 2014-06-05T14:17:52.815 0.003 0.000 -0.003 55357 2014-06-06T23:52:02.815 0.006 -0.000 -0.006 55369 2014-06-07T23:34:52.815 -0.015 -0.000 0.013 55386 2014-06-09T09:09:52.815 0.006 0.000 -0.005 55404 2014-06-10T19:29:28.815 -0.005 -0.000 -0.004 55421 2014-06-12T06:16:24.815 -0.003 0.000 0.002 55434 2014-06-13T07:52:01.815 -0.001 0.000 0.001 55448 2014-06-14T10:39:06.815 -0.007 0.000 -0.006 55466 2014-06-15T23:08:52.815 0.004 0.000 -0.003 55479 2014-06-17T00:02:32.815 0.008 -0.000 0.005 55491 2014-06-17T23:20:17.815 -0.014 0.000 -0.011 55505 2014-06-19T04:09:15.815 -0.001 0.000 0.001 55522 2014-06-20T13:44:03.815 0.005 -0.000 -0.005 55539 2014-06-21T23:19:08.815 -0.004 0.000 0.004 55550 2014-06-22T21:02:52.815 -0.003 -0.000 0.003 55569 2014-06-24T10:25:52.815 0.001 0.000 -0.001 55582 2014-06-25T11:04:52.815 0.005 -0.000 0.004 55609 2014-06-27T17:34:22.815 0.003 -0.000 -0.003 55624 2014-06-28T23:11:52.815 -0.003 0.000 0.003 55642 2014-06-30T10:44:42.815 0.003 -0.000 -0.003