2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Jun 4 14:58:19 PDT 2015 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 57885 through 58977): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2015 JAN 01 00:01:07.183 2015 APR 01 01:01:07.185 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_od57876-57975_rec_v1.bsp spk_m_od57974-58052_rec_v1.bsp spk_m_od58051-58145_rec_v1.bsp spk_m_od58144-58210_rec_v1.bsp spk_m_od58204-58308_rec_v1.bsp spk_m_od58307-58393_rec_v1.bsp spk_m_od58371-58465_rec_v1.bsp spk_m_od58462-58561_rec_v1.bsp spk_m_od58559-58648_rec_v1.bsp spk_m_od58646-58736_rec_v1.bsp spk_m_od58731-58830_rec_v1.bsp spk_m_od58828-58906_rec_v1.bsp spk_m_od58906-58994_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_ext42.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 57895 2015-01-01T21:58:52.816 0.005 0.000 -0.003 57912 2015-01-03T07:33:52.816 -0.000 0.000 0.000 57929 2015-01-04T17:09:52.815 -0.010 0.000 0.007 57942 2015-01-05T18:50:04.815 -0.006 0.000 0.004 57973 2015-01-08T08:44:21.815 0.010 -0.000 0.005 57994 2015-01-10T01:33:21.815 0.011 -0.000 -0.007 58015 2015-01-11T18:55:27.815 -0.013 -0.000 0.009 58027 2015-01-12T18:46:52.815 0.019 -0.000 -0.013 58050 2015-01-14T15:28:52.815 -0.013 0.000 -0.004 58071 2015-01-16T09:41:52.815 0.008 0.000 -0.006 58083 2015-01-17T09:24:52.815 -0.019 0.001 0.013 58101 2015-01-18T21:00:52.815 -0.013 0.000 0.008 58120 2015-01-20T09:54:40.815 0.006 0.000 0.001 58143 2015-01-22T07:34:31.815 -0.003 -0.000 0.001 58165 2015-01-24T02:40:01.815 -0.002 -0.000 -0.001 58192 2015-01-26T08:48:07.815 -0.010 0.000 0.006 58203 2015-01-27T05:54:40.815 0.009 0.000 0.000 58225 2015-01-29T02:00:44.815 -0.013 0.000 0.008 58246 2015-01-30T18:59:52.815 -0.001 -0.000 0.000 58270 2015-02-01T18:56:27.815 -0.009 0.000 0.005 58290 2015-02-03T09:28:52.815 -0.005 -0.000 -0.003 58306 2015-02-04T17:45:52.815 0.024 -0.000 -0.013 58322 2015-02-06T01:40:52.815 0.017 -0.000 -0.010 58337 2015-02-07T07:20:52.815 0.006 -0.000 -0.004 58350 2015-02-08T09:01:52.815 -0.008 -0.000 0.005 58367 2015-02-09T18:37:26.815 -0.005 0.000 0.003 58370 2015-02-10T01:08:52.814 -0.000 -0.001 0.000 58428 2015-02-14T18:59:22.814 -0.011 0.000 0.007 58446 2015-02-16T06:44:07.814 0.011 -0.000 -0.006 58461 2015-02-17T13:03:52.814 0.029 0.000 0.016 58482 2015-02-19T05:54:52.814 0.003 0.001 -0.002 58496 2015-02-20T08:53:52.814 -0.020 0.000 0.000 58510 2015-02-21T13:13:52.814 0.021 -0.000 -0.011 58529 2015-02-23T02:33:52.814 0.012 -0.000 -0.007 58544 2015-02-24T08:25:54.814 -0.007 0.000 0.003 58558 2015-02-25T12:35:52.814 -0.011 -0.000 -0.004 58582 2015-02-27T10:38:37.814 0.035 0.000 0.012 58600 2015-02-28T22:41:56.814 -0.000 -0.000 -0.000 58614 2015-03-02T02:29:52.814 0.006 -0.000 -0.004 58629 2015-03-03T08:24:52.814 -0.002 -0.000 0.001 58645 2015-03-04T16:28:52.814 -0.019 -0.000 -0.006 58666 2015-03-06T08:18:52.814 0.001 -0.000 0.000 58683 2015-03-07T18:58:52.814 -0.008 0.000 0.004 58701 2015-03-09T05:47:52.814 -0.022 -0.000 -0.007 58720 2015-03-10T18:57:52.814 -0.026 -0.000 -0.014 58730 2015-03-11T16:26:17.814 0.015 0.000 0.004 58750 2015-03-13T08:10:52.814 0.030 0.000 0.015 58775 2015-03-15T08:03:12.814 0.008 -0.000 0.002 58786 2015-03-16T05:33:47.814 -0.004 0.000 -0.002 58805 2015-03-17T18:58:32.814 0.031 0.001 0.016 58827 2015-03-19T15:15:52.814 -0.023 0.000 0.010 58847 2015-03-21T07:48:52.814 0.005 0.000 0.002 58860 2015-03-22T07:47:52.814 -0.016 -0.000 -0.007 58884 2015-03-24T07:36:53.814 -0.008 0.000 0.000 58905 2015-03-26T01:01:52.814 0.002 -0.000 0.000 58934 2015-03-28T10:09:02.814 0.036 0.000 0.012 58944 2015-03-29T07:00:52.814 0.004 -0.000 -0.001 58962 2015-03-30T18:52:42.814 0.029 0.000 0.007