2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Feb 15 15:39:31 PST 2018 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 70075 through 71191): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2017 OCT 01 00:01:09.182 2018 JAN 01 01:01:09.183 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_od70041-70122_rec_v1.bsp spk_m_od70121-70215_rec_v1.bsp spk_m_od70211-70292_rec_v1.bsp spk_m_od70291-70382_rec_v1.bsp spk_m_od70380-70466_rec_v1.bsp spk_m_od70460-70552_rec_v1.bsp spk_m_od70549-70633_rec_v1.bsp spk_m_od70631-70709_rec_v1.bsp spk_m_od70703-70800_rec_v1.bsp spk_m_od70793-70885_rec_v1.bsp spk_m_od70884-70967_rec_v1.bsp spk_m_od70965-71067_rec_v1.bsp spk_m_od71066-71149_rec_v1.bsp spk_m_od71148-71231_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_ext53.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 70076 2017-10-01T03:33:50.817 0.060 -0.000 0.025 70088 2017-10-02T02:43:50.817 -0.037 -0.000 0.004 70103 2017-10-03T08:53:50.817 -0.015 0.000 -0.006 70121 2017-10-04T20:33:50.817 0.039 -0.000 0.016 70140 2017-10-06T10:03:50.817 -0.028 0.000 -0.011 70152 2017-10-07T09:33:50.817 0.045 -0.000 0.011 70167 2017-10-08T16:08:50.817 0.048 0.000 -0.007 70179 2017-10-09T15:04:28.817 -0.017 -0.000 -0.006 70196 2017-10-11T00:04:22.817 -0.015 -0.000 0.006 70203 2017-10-11T14:59:48.817 -0.042 -0.000 -0.011 70211 2017-10-12T05:44:18.817 0.057 0.000 -0.020 70232 2017-10-14T00:38:56.817 0.042 0.000 -0.004 70257 2017-10-16T01:48:50.817 -0.019 -0.000 -0.005 70276 2017-10-17T15:13:50.817 -0.042 0.000 -0.016 70291 2017-10-18T19:52:50.817 0.030 0.000 -0.012 70321 2017-10-21T08:43:50.817 -0.036 -0.000 0.007 70341 2017-10-22T23:53:50.817 -0.009 0.000 -0.002 70359 2017-10-24T10:39:50.817 0.028 0.000 -0.002 70373 2017-10-25T14:42:50.817 0.031 -0.000 0.011 70380 2017-10-26T05:32:50.817 -0.052 -0.000 0.018 70395 2017-10-27T10:41:50.817 -0.010 0.000 -0.002 70410 2017-10-28T16:32:50.817 0.024 0.000 0.001 70427 2017-10-30T01:14:50.817 0.013 -0.000 0.001 70444 2017-10-31T10:22:50.817 -0.039 -0.000 0.016 70454 2017-11-01T07:18:50.817 -0.047 0.001 -0.014 70460 2017-11-01T19:17:50.817 0.025 -0.000 0.005 70473 2017-11-02T21:25:50.817 -0.025 -0.000 0.008 70491 2017-11-04T08:57:50.817 -0.006 -0.000 0.002 70502 2017-11-05T06:37:50.817 0.035 0.000 -0.006 70511 2017-11-06T00:34:50.817 -0.015 -0.000 0.005 70530 2017-11-07T13:47:50.817 -0.019 0.000 -0.002 70543 2017-11-08T15:33:50.817 0.013 -0.000 0.000 70549 2017-11-09T03:11:50.817 0.006 -0.000 0.002 70563 2017-11-10T07:23:50.817 0.021 -0.000 -0.007 70580 2017-11-11T15:25:50.817 0.035 -0.000 -0.012 70608 2017-11-13T23:13:50.817 0.012 -0.000 0.002 70620 2017-11-14T23:44:50.817 -0.036 0.000 -0.004 70631 2017-11-15T21:56:50.817 -0.004 -0.000 0.001 70656 2017-11-17T22:28:50.817 0.014 -0.000 0.006 70670 2017-11-19T02:33:50.817 -0.005 -0.000 -0.001 70681 2017-11-19T23:23:50.817 -0.035 0.000 0.003 70703 2017-11-21T18:31:50.817 -0.005 0.000 0.002 70726 2017-11-23T16:13:50.817 -0.068 0.000 0.018 70745 2017-11-25T06:32:50.817 0.020 -0.000 0.008 70754 2017-11-26T00:14:50.817 -0.010 -0.000 -0.004 70770 2017-11-27T07:24:50.817 0.008 -0.000 -0.000 70788 2017-11-28T20:22:50.816 -0.003 -0.000 0.001 70793 2017-11-29T05:05:50.816 0.014 -0.000 0.002 70813 2017-11-30T20:26:50.816 0.016 -0.000 -0.001 70830 2017-12-02T06:49:50.816 0.015 0.000 0.005 70842 2017-12-03T06:57:50.816 -0.008 -0.000 0.001 70856 2017-12-04T09:09:50.816 -0.008 -0.000 0.003 70867 2017-12-05T07:44:50.816 -0.013 -0.000 -0.005 70884 2017-12-06T17:55:50.816 -0.003 0.000 0.000 70904 2017-12-08T08:24:50.816 -0.012 0.000 0.000 70923 2017-12-09T22:26:50.816 0.004 -0.000 0.002 70934 2017-12-10T20:38:50.816 -0.009 0.000 -0.001 70943 2017-12-11T14:25:50.816 0.016 0.000 0.002 70959 2017-12-12T21:36:50.816 -0.002 0.000 -0.001 70965 2017-12-13T08:44:50.816 -0.012 -0.000 0.004 70988 2017-12-15T07:24:50.816 0.005 0.000 0.001 70995 2017-12-15T20:27:50.816 0.006 0.000 0.000 71013 2017-12-17T08:16:50.816 0.007 -0.000 0.002 71031 2017-12-18T20:21:50.816 -0.002 -0.000 -0.000 71049 2017-12-20T07:47:50.816 0.011 -0.000 0.004 71066 2017-12-21T17:49:50.816 -0.040 -0.000 0.002 71077 2017-12-22T15:18:50.816 0.000 -0.000 0.000 71085 2017-12-23T06:02:50.816 -0.020 0.000 0.006 71102 2017-12-24T16:47:50.816 0.009 0.000 0.002 71118 2017-12-25T23:01:50.816 -0.015 -0.000 0.005 71138 2017-12-27T15:24:50.816 0.022 -0.000 0.005 71148 2017-12-28T12:03:50.816 -0.024 -0.000 0.003 71175 2017-12-30T15:48:50.816 0.011 0.000 -0.004 71185 2017-12-31T12:13:50.816 -0.015 0.000 -0.002