2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed May 11 09:36:25 PDT 2011 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 40136 through 41228): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2011 JAN 01 00:01:06.183 2011 APR 01 01:01:06.185 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_od40109-40194_rec_v1.bsp spk_m_od40194-40274_rec_v1.bsp spk_m_od40273-40364_rec_v1.bsp spk_m_od40364-40451_rec_v1.bsp spk_m_od40449-40521_rec_v1.bsp spk_m_od40519-40608_rec_v1.bsp spk_m_od40607-40709_rec_v1.bsp spk_m_od40708-40790_rec_v1.bsp spk_m_od40788-40873_rec_v1.bsp spk_m_od40872-40962_rec_v1.bsp spk_m_od40960-41046_rec_v1.bsp spk_m_od41044-41139_rec_v1.bsp spk_m_od41137-41213_rec_v1.bsp spk_m_od41211-41294_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_ext26.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 40149 2011-01-02T04:18:53.816 0.005 -0.000 -0.001 40164 2011-01-03T09:51:53.816 0.021 -0.000 -0.007 40179 2011-01-04T14:51:53.815 0.028 0.000 -0.002 40194 2011-01-05T20:50:53.815 -0.006 0.000 0.003 40214 2011-01-07T12:26:53.815 0.005 -0.000 -0.002 40232 2011-01-09T00:21:53.815 0.003 0.001 -0.001 40241 2011-01-09T17:43:53.815 0.024 -0.000 -0.010 40256 2011-01-10T22:48:53.815 -0.006 0.000 -0.002 40273 2011-01-12T09:58:53.815 0.012 0.000 0.006 40292 2011-01-13T21:58:53.815 0.056 0.001 0.013 40316 2011-01-15T21:33:53.815 -0.014 -0.000 -0.000 40337 2011-01-17T15:05:53.815 0.018 0.001 -0.001 40350 2011-01-18T17:00:53.815 -0.021 0.001 0.009 40364 2011-01-19T20:23:53.815 0.005 0.001 0.000 40380 2011-01-21T04:30:53.815 -0.002 0.000 0.002 40401 2011-01-22T22:40:53.815 0.002 0.000 0.000 40419 2011-01-24T10:18:53.815 0.004 0.000 0.001 40433 2011-01-25T12:48:53.815 -0.014 -0.000 0.001 40449 2011-01-26T21:36:53.815 0.014 -0.001 0.006 40460 2011-01-27T19:08:53.815 0.024 0.007 0.002 40478 2011-01-29T06:03:53.815 -0.026 0.001 0.016 40494 2011-01-30T14:18:53.815 -0.027 0.000 -0.001 40519 2011-02-01T15:58:53.815 0.026 0.000 0.013 40594 2011-02-07T19:23:53.815 0.005 0.000 -0.004 40607 2011-02-08T20:41:53.815 -0.022 0.000 0.004 40621 2011-02-10T01:12:53.814 -0.028 0.000 0.004 40634 2011-02-11T02:53:53.814 0.031 0.000 -0.004 40646 2011-02-12T02:35:53.814 -0.016 0.001 0.003 40662 2011-02-13T10:06:53.814 -0.018 0.001 0.007 40677 2011-02-14T15:50:53.814 0.024 0.000 -0.005 40693 2011-02-15T23:08:53.814 -0.011 0.000 0.008 40708 2011-02-17T05:29:53.814 -0.001 0.000 -0.000 40731 2011-02-19T02:32:53.814 -0.019 0.000 0.004 40744 2011-02-20T04:13:53.814 0.015 -0.000 -0.004 40757 2011-02-21T05:52:53.814 -0.001 -0.000 0.000 40777 2011-02-22T20:58:53.814 -0.011 0.000 0.009 40788 2011-02-23T19:38:53.814 0.013 -0.000 0.010 40803 2011-02-24T23:58:53.814 -0.001 0.000 -0.000 40822 2011-02-26T14:08:53.814 0.021 0.000 -0.016 40839 2011-02-28T00:48:53.814 -0.025 -0.000 -0.016 40855 2011-03-01T07:03:53.814 0.027 0.000 -0.022 40872 2011-03-02T16:13:53.814 0.003 -0.000 0.001 40891 2011-03-04T06:23:53.814 0.003 -0.000 -0.003 40912 2011-03-05T23:48:53.814 -0.000 0.000 0.000 40925 2011-03-07T02:43:53.814 -0.003 -0.000 -0.002 40945 2011-03-08T16:33:53.814 0.005 0.000 -0.001 40960 2011-03-09T23:27:53.814 -0.004 0.000 -0.003 40974 2011-03-11T02:00:53.814 0.011 0.000 -0.006 40993 2011-03-12T16:01:53.814 -0.028 0.001 0.025 41009 2011-03-13T23:48:53.814 0.011 -0.000 -0.006 41029 2011-03-15T15:13:53.814 0.011 -0.000 -0.009 41044 2011-03-16T21:28:53.814 -0.006 0.000 -0.006 41066 2011-03-18T16:08:53.814 -0.002 -0.000 0.002 41082 2011-03-19T23:48:53.814 0.001 -0.000 -0.001 41099 2011-03-21T09:23:53.814 0.013 -0.000 -0.014 41119 2011-03-23T01:00:53.814 -0.013 0.000 0.013 41137 2011-03-24T13:40:53.814 -0.005 -0.000 -0.004 41157 2011-03-26T03:37:53.814 -0.008 0.000 0.005 41169 2011-03-27T03:56:53.814 0.004 0.000 -0.003 41187 2011-03-28T15:30:53.814 0.005 -0.000 -0.004 41211 2011-03-30T15:41:53.814 -0.002 -0.000 -0.002 41228 2011-04-01T00:13:53.814 -0.000 -0.000 0.000