2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon May 9 15:23:13 PDT 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 62319 through 63422): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 JAN 01 00:01:08.183 2016 APR 01 01:01:08.185 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_od62198-62395_rec_v1.bsp spk_m_od62394-62473_rec_v1.bsp spk_m_od62471-62567_rec_v1.bsp spk_m_od62566-62649_rec_v1.bsp spk_m_od62647-62736_rec_v1.bsp spk_m_od62735-62824_rec_v1.bsp spk_m_od62820-62896_rec_v1.bsp spk_m_od62895-62991_rec_v1.bsp spk_m_od62990-63074_rec_v1.bsp spk_m_od63072-63163_rec_v1.bsp spk_m_od63161-63243_rec_v1.bsp spk_m_od63242-63330_rec_v1.bsp spk_m_od63326-63412_rec_v1.bsp spk_m_od63411-63502_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_ext46.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 62333 2016-01-02T06:08:51.816 0.008 0.000 -0.002 62351 2016-01-03T18:26:51.816 -0.011 -0.000 -0.006 62370 2016-01-05T08:28:51.815 0.003 0.000 -0.000 62394 2016-01-07T07:41:16.815 0.010 -0.000 0.003 62406 2016-01-08T06:21:34.815 0.010 0.000 -0.004 62424 2016-01-09T17:29:09.815 -0.008 -0.000 0.003 62436 2016-01-10T17:43:20.815 0.001 0.000 -0.000 62455 2016-01-12T07:13:51.815 0.001 0.000 -0.000 62471 2016-01-13T15:30:51.815 -0.005 0.000 -0.003 62491 2016-01-15T06:31:51.815 -0.011 0.000 0.002 62511 2016-01-16T21:35:51.815 0.007 -0.000 -0.003 62530 2016-01-18T12:11:51.815 -0.017 0.000 -0.008 62551 2016-01-20T04:52:26.815 0.015 0.000 -0.007 62566 2016-01-21T10:30:23.815 0.001 -0.000 -0.000 62588 2016-01-23T05:52:23.815 0.021 0.000 -0.010 62606 2016-01-24T18:20:34.815 -0.005 -0.000 -0.002 62629 2016-01-26T15:56:51.815 0.002 0.000 0.001 62647 2016-01-28T03:13:51.815 0.000 -0.000 0.000 62664 2016-01-29T13:43:51.815 -0.012 -0.000 0.002 62689 2016-01-31T13:33:51.815 0.000 0.000 0.000 62714 2016-02-02T15:10:21.815 0.013 -0.000 -0.005 62735 2016-02-04T09:49:51.815 -0.012 -0.000 -0.002 62757 2016-02-06T05:28:51.815 0.004 -0.000 -0.000 62775 2016-02-07T16:37:51.815 -0.008 0.000 -0.003 62795 2016-02-09T07:09:05.815 0.008 -0.000 -0.003 62820 2016-02-11T09:52:21.814 0.003 0.001 0.001 62836 2016-02-12T16:03:28.814 0.007 -0.000 -0.003 62859 2016-02-14T13:56:19.814 -0.001 0.000 0.000 62879 2016-02-16T04:48:51.814 -0.008 -0.000 0.002 62895 2016-02-17T13:28:51.814 0.001 -0.000 0.000 62916 2016-02-19T06:28:51.814 -0.003 0.000 0.001 62931 2016-02-20T13:04:51.814 -0.010 -0.000 -0.004 62956 2016-02-22T13:33:51.814 -0.009 0.000 0.003 62969 2016-02-23T16:27:22.814 0.004 -0.000 0.000 62982 2016-02-24T16:37:47.814 0.006 -0.000 -0.002 62990 2016-02-25T09:11:43.814 -0.005 -0.000 -0.001 63013 2016-02-27T06:54:57.814 -0.012 0.000 -0.004 63030 2016-02-28T15:25:16.814 0.004 -0.000 -0.001 63049 2016-03-01T06:16:51.814 0.008 0.000 0.003 63072 2016-03-03T02:48:51.814 -0.001 0.000 0.000 63091 2016-03-04T16:38:51.814 0.009 -0.000 -0.001 63111 2016-03-06T08:54:51.814 -0.005 0.000 -0.001 63127 2016-03-07T15:23:29.814 0.007 0.000 -0.002 63147 2016-03-09T07:54:01.814 0.003 -0.000 0.001 63161 2016-03-10T12:11:51.814 0.004 0.000 -0.000 63184 2016-03-12T08:30:51.814 0.006 0.000 -0.000 63201 2016-03-13T18:05:51.814 -0.012 0.001 0.001 63213 2016-03-14T18:44:56.814 0.020 0.000 0.003 63224 2016-03-15T15:54:29.814 0.018 -0.000 0.004 63242 2016-03-17T03:59:53.814 -0.018 -0.000 -0.004 63260 2016-03-18T15:27:29.814 -0.001 0.000 -0.000 63273 2016-03-19T16:50:57.814 -0.018 0.000 -0.004 63296 2016-03-21T13:37:51.814 0.006 -0.000 -0.002 63316 2016-03-23T05:09:47.814 -0.002 0.000 0.001 63326 2016-03-24T01:57:30.814 0.000 0.000 0.000 63343 2016-03-25T10:07:30.814 -0.008 -0.000 0.001 63366 2016-03-27T07:45:23.814 0.010 0.000 -0.002 63383 2016-03-28T18:35:04.814 -0.024 -0.000 -0.005 63401 2016-03-30T05:34:51.814 0.023 -0.000 0.001 63411 2016-03-31T00:38:45.814 0.011 0.000 -0.002