2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Feb 5 12:04:46 PST 2020 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 78938 through 80054): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2019 OCT 01 00:01:09.182 2020 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_od78880-78960_rec_v1.bsp spk_m_od78960-79054_rec_v1.bsp spk_m_od79054-79128_rec_v1.bsp spk_m_od79127-79217_rec_v1.bsp spk_m_od79215-79308_rec_v1.bsp spk_m_od79305-79378_rec_v1.bsp spk_m_od79378-79470_rec_v1.bsp spk_m_od79466-79567_rec_v1.bsp spk_m_od79566-79633_rec_v1.bsp spk_m_od79633-79724_rec_v1.bsp spk_m_od79724-79810_rec_v1.bsp spk_m_od79809-79895_rec_v1.bsp spk_m_od79893-80001_rec_v1.bsp spk_m_od80000-80077_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_ext61.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 78943 2019-10-01T11:40:50.817 0.054 -0.001 0.021 78960 2019-10-02T20:59:50.817 0.000 0.000 -0.000 78980 2019-10-04T12:06:50.817 -0.011 -0.000 0.001 78985 2019-10-04T23:30:50.817 0.041 0.000 -0.018 79009 2019-10-06T22:19:50.817 -0.039 0.001 -0.007 79030 2019-10-08T15:50:50.817 0.047 -0.000 0.007 79054 2019-10-10T14:13:50.817 0.053 0.000 -0.012 79076 2019-10-12T09:40:50.817 0.068 0.001 -0.018 79087 2019-10-13T07:53:50.817 -0.057 -0.000 -0.018 79112 2019-10-15T09:38:50.817 0.040 -0.000 0.015 79127 2019-10-16T14:33:50.817 -0.036 -0.000 0.006 79149 2019-10-18T10:26:50.817 0.007 -0.000 0.002 79164 2019-10-19T16:25:50.817 -0.038 0.000 -0.014 79188 2019-10-21T15:55:50.817 -0.012 -0.000 -0.004 79215 2019-10-23T20:31:50.817 0.004 0.000 -0.001 79228 2019-10-24T23:07:50.817 0.033 -0.001 0.006 79245 2019-10-26T08:27:50.817 0.083 -0.001 0.031 79261 2019-10-27T16:34:50.817 0.019 -0.000 -0.001 79281 2019-10-29T08:16:50.817 -0.037 -0.000 0.009 79297 2019-10-30T15:50:50.817 0.006 0.000 -0.001 79305 2019-10-31T06:33:50.817 0.045 -0.000 0.004 79318 2019-11-01T09:41:50.817 -0.003 0.000 0.001 79332 2019-11-02T13:13:50.817 0.022 0.000 -0.008 79343 2019-11-03T10:03:50.817 0.002 0.000 0.001 79359 2019-11-04T18:07:50.817 -0.033 0.000 -0.003 79378 2019-11-06T06:28:50.817 -0.022 -0.001 0.006 79394 2019-11-07T15:21:50.817 0.064 -0.000 0.001 79407 2019-11-08T15:52:50.817 -0.066 0.001 0.014 79420 2019-11-09T18:12:50.817 -0.048 -0.001 -0.017 79431 2019-11-10T16:01:50.817 -0.041 0.001 -0.014 79451 2019-11-12T07:51:50.817 -0.012 0.000 -0.002 79466 2019-11-13T13:48:50.817 0.102 0.000 -0.014 79488 2019-11-15T07:53:50.817 0.011 0.000 -0.003 79505 2019-11-16T17:29:50.817 0.047 0.001 -0.012 79516 2019-11-17T16:47:50.817 0.032 0.000 -0.008 79527 2019-11-18T12:47:50.817 0.019 0.001 -0.006 79542 2019-11-19T18:42:50.817 -0.021 -0.000 0.004 79566 2019-11-21T19:12:50.817 -0.005 -0.000 -0.001 79578 2019-11-22T18:57:50.817 0.025 -0.000 0.002 79597 2019-11-24T08:49:50.817 0.014 0.000 -0.003 79615 2019-11-25T20:24:50.817 0.044 0.000 -0.009 79633 2019-11-27T06:22:50.817 0.070 0.001 -0.019 79647 2019-11-28T10:03:50.816 0.059 0.000 -0.015 79666 2019-11-30T01:03:50.816 0.036 0.000 -0.003 79688 2019-12-01T20:11:50.816 -0.004 0.000 -0.001 79706 2019-12-03T07:29:50.816 -0.017 0.000 -0.005 79724 2019-12-04T18:21:50.816 0.011 -0.000 -0.002 79738 2019-12-05T22:03:50.816 0.091 0.000 -0.015 79756 2019-12-07T09:58:50.816 -0.063 0.000 -0.006 79768 2019-12-08T09:58:50.816 -0.033 0.000 -0.008 79783 2019-12-09T15:24:50.816 -0.093 0.001 -0.013 79792 2019-12-10T09:40:50.816 -0.076 0.000 -0.016 79809 2019-12-11T19:51:50.816 0.038 -0.000 -0.007 79828 2019-12-13T08:43:50.816 -0.151 0.001 -0.035 79845 2019-12-14T18:15:50.816 -0.084 0.001 -0.019 79857 2019-12-15T18:15:50.816 0.089 -0.000 0.013 79877 2019-12-17T09:03:50.816 -0.058 0.000 -0.002 79893 2019-12-18T17:56:50.816 0.109 0.001 -0.019 79917 2019-12-20T16:19:50.816 0.023 -0.000 0.003 79926 2019-12-21T11:04:50.816 0.072 0.000 -0.009 79945 2019-12-22T23:27:50.816 -0.043 0.000 -0.001 79962 2019-12-24T09:05:50.816 0.004 0.001 0.000 79979 2019-12-25T19:52:50.816 -0.099 -0.002 0.014 79992 2019-12-26T19:47:50.816 0.046 0.000 -0.009 80000 2019-12-27T13:15:50.816 0.052 0.000 -0.004 80029 2019-12-29T21:57:50.816 0.041 -0.001 0.007 80048 2019-12-31T10:19:50.816 -0.094 -0.000 0.013