2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 2 14:48:43 PST 2016 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 61201 through 62318): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2015 OCT 01 00:01:08.182 2016 JAN 01 01:01:08.183 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_od61203-61289_rec_v1.bsp spk_m_od61283-61371_rec_v1.bsp spk_m_od61368-61459_rec_v1.bsp spk_m_od61458-61540_rec_v1.bsp spk_m_od61538-61629_rec_v1.bsp spk_m_od61628-61703_rec_v1.bsp spk_m_od61701-61794_rec_v1.bsp spk_m_od61792-61863_rec_v1.bsp spk_m_od61862-61957_rec_v1.bsp spk_m_od61955-62049_rec_v1.bsp spk_m_od62047-62130_rec_v1.bsp spk_m_od62129-62200_rec_v1.bsp spk_m_od62198-62395_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_ext45.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 61203 2015-10-01T04:48:51.817 0.008 -0.001 0.001 61233 2015-10-03T16:38:51.817 0.001 0.000 0.001 61248 2015-10-04T22:23:51.817 -0.013 0.000 -0.004 61262 2015-10-06T00:52:47.817 0.021 0.000 -0.010 61269 2015-10-06T15:32:35.817 0.043 -0.000 0.018 61283 2015-10-07T19:37:01.817 -0.020 -0.001 -0.006 61304 2015-10-09T12:11:11.817 0.002 0.000 -0.000 61321 2015-10-10T22:27:01.817 -0.023 0.000 -0.011 61347 2015-10-13T00:52:31.817 0.030 0.000 -0.014 61357 2015-10-13T22:07:51.817 -0.027 -0.000 0.001 61368 2015-10-14T19:35:51.817 0.040 -0.000 0.014 61387 2015-10-16T08:17:51.817 -0.005 -0.000 0.001 61407 2015-10-17T23:27:51.817 0.038 0.000 -0.019 61421 2015-10-19T03:23:51.817 -0.010 -0.000 0.003 61442 2015-10-20T20:58:51.817 0.005 0.000 -0.001 61458 2015-10-22T04:49:16.817 0.001 -0.000 0.000 61487 2015-10-24T15:19:51.817 -0.031 -0.000 0.012 61499 2015-10-25T14:38:51.817 0.026 0.000 0.005 61515 2015-10-26T21:54:51.817 0.018 -0.000 0.009 61528 2015-10-27T22:58:51.817 0.011 -0.000 -0.002 61538 2015-10-28T19:42:51.817 -0.038 -0.000 -0.008 61556 2015-10-30T07:38:51.817 -0.019 -0.000 0.006 61576 2015-10-31T21:48:51.817 -0.008 0.000 0.002 61589 2015-11-01T23:24:51.817 -0.016 0.000 0.006 61609 2015-11-03T15:36:28.817 0.015 0.000 0.007 61628 2015-11-05T04:15:18.817 0.007 0.000 -0.003 61646 2015-11-06T17:14:34.817 0.007 -0.000 0.001 61671 2015-11-08T17:32:15.817 -0.014 0.000 0.004 61685 2015-11-09T21:11:51.817 0.050 0.000 -0.017 61701 2015-11-11T05:18:51.817 0.071 -0.000 0.030 61718 2015-11-12T15:31:51.817 0.004 -0.000 0.001 61738 2015-11-14T06:36:51.817 0.004 0.000 0.003 61757 2015-11-15T19:33:51.817 -0.001 -0.000 0.000 61779 2015-11-17T15:03:38.817 0.014 0.000 -0.004 61792 2015-11-18T17:49:15.817 -0.003 0.000 -0.000 61818 2015-11-20T19:43:21.817 -0.022 -0.000 0.011 61830 2015-11-21T20:50:22.817 0.013 0.000 0.004 61848 2015-11-23T07:26:00.817 -0.004 -0.000 0.001 61862 2015-11-24T11:39:24.817 0.008 0.000 0.004 61878 2015-11-25T20:07:03.817 -0.007 -0.000 0.003 61900 2015-11-27T15:07:24.817 0.029 -0.000 0.011 61914 2015-11-28T17:53:46.816 -0.013 0.000 0.004 61927 2015-11-29T19:32:51.816 0.007 -0.000 -0.002 61936 2015-11-30T14:12:51.816 -0.011 -0.000 -0.005 61955 2015-12-02T03:58:28.816 0.010 -0.000 0.002 61981 2015-12-04T07:21:07.816 -0.003 0.000 -0.001 62000 2015-12-05T19:26:14.816 0.003 -0.000 -0.001 62012 2015-12-06T20:00:34.816 0.004 -0.000 0.001 62034 2015-12-08T15:41:51.816 -0.003 -0.000 -0.002 62047 2015-12-09T17:02:41.816 0.012 -0.001 0.002 62070 2015-12-11T14:09:23.816 0.013 -0.000 -0.005 62086 2015-12-12T21:43:29.816 -0.006 0.000 0.002 62102 2015-12-14T05:00:08.816 0.012 0.000 -0.005 62114 2015-12-15T06:33:51.816 0.003 -0.000 -0.001 62129 2015-12-16T11:18:51.816 0.011 -0.000 0.004 62145 2015-12-17T19:48:51.816 0.026 0.000 -0.006 62167 2015-12-19T13:57:51.816 -0.008 0.000 0.003 62183 2015-12-20T22:18:51.816 -0.004 -0.000 -0.002 62198 2015-12-22T03:41:51.816 -0.013 0.000 -0.005 62212 2015-12-23T06:57:51.816 -0.018 -0.000 0.005 62230 2015-12-24T19:08:51.816 -0.002 0.000 -0.001 62248 2015-12-26T06:50:51.816 0.005 0.000 0.002 62267 2015-12-27T20:58:51.816 -0.015 -0.000 0.004 62285 2015-12-29T07:02:51.816 0.017 0.000 -0.008 62302 2015-12-30T17:58:51.816 0.033 0.000 0.002 62314 2015-12-31T16:30:51.816 -0.017 0.000 0.006