2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Aug 12 09:32:11 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 41229 through 42333): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2011 APR 01 00:01:06.185 2011 JUL 01 01:01:06.184 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_od41211-41294_rec_v1.bsp spk_m_od41292-41386_rec_v1.bsp spk_m_od41384-41475_rec_v1.bsp spk_m_od41474-41560_rec_v1.bsp spk_m_od41559-41648_rec_v1.bsp spk_m_od41647-41730_rec_v1.bsp spk_m_od41728-41811_rec_v1.bsp spk_m_od41808-41883_rec_v1.bsp spk_m_od41882-41985_rec_v1.bsp spk_m_od41983-42053_rec_v1.bsp spk_m_od42052-42146_rec_v1.bsp spk_m_od42144-42235_rec_v1.bsp spk_m_od42234-42326_rec_v1.bsp spk_m_od42324-42409_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_ext27.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 41229 2011-04-01T00:13:53.814 0.000 0.000 -0.000 41245 2011-04-02T10:06:53.814 -0.004 0.000 0.003 41260 2011-04-03T15:44:53.814 0.007 -0.000 -0.005 41275 2011-04-04T21:03:53.814 0.001 -0.000 -0.002 41292 2011-04-06T07:33:53.814 -0.001 0.000 -0.001 41311 2011-04-07T20:13:53.814 0.012 -0.000 -0.015 41330 2011-04-09T09:20:53.814 -0.002 -0.000 0.000 41347 2011-04-10T18:58:53.814 -0.007 0.000 0.002 41366 2011-04-12T08:50:53.814 0.001 -0.000 -0.002 41384 2011-04-13T21:23:53.814 -0.007 -0.000 -0.010 41403 2011-04-15T10:03:53.814 -0.009 0.000 0.012 41422 2011-04-16T23:50:53.814 0.008 -0.000 -0.008 41437 2011-04-18T05:28:53.814 -0.017 0.000 0.016 41454 2011-04-19T15:04:53.814 0.007 0.000 -0.007 41474 2011-04-21T07:13:53.814 0.002 0.000 0.003 41496 2011-04-23T01:38:53.814 -0.004 0.000 0.006 41513 2011-04-24T11:03:53.814 -0.009 0.000 0.006 41531 2011-04-25T23:12:53.814 0.014 -0.000 -0.015 41548 2011-04-27T08:48:53.814 -0.008 -0.000 0.009 41559 2011-04-28T07:06:53.814 0.003 -0.000 0.004 41580 2011-04-30T00:01:53.814 -0.003 -0.000 0.004 41597 2011-05-01T09:35:53.814 -0.001 0.000 0.001 41613 2011-05-02T17:13:53.814 0.002 0.000 -0.003 41628 2011-05-03T23:43:53.814 0.004 0.000 0.007 41647 2011-05-05T13:03:53.814 -0.001 -0.000 -0.001 41669 2011-05-07T07:52:53.814 -0.004 0.000 0.005 41689 2011-05-08T23:03:53.814 -0.007 -0.000 0.011 41709 2011-05-10T14:54:53.814 0.009 -0.000 -0.012 41728 2011-05-12T05:30:53.814 0.002 0.000 0.002 41745 2011-05-13T14:02:53.814 -0.002 0.000 0.002 41758 2011-05-14T15:43:53.814 0.002 0.000 -0.003 41774 2011-05-15T23:20:53.814 -0.002 -0.000 0.003 41793 2011-05-17T12:33:53.814 0.001 0.000 -0.002 41808 2011-05-18T19:13:53.814 0.008 0.000 0.014 41831 2011-05-20T15:38:53.814 0.008 0.000 -0.013 41848 2011-05-22T01:33:53.814 0.002 -0.000 -0.002 41867 2011-05-23T15:05:53.814 -0.002 -0.000 0.003 41882 2011-05-24T21:23:53.814 -0.002 0.000 -0.004 41904 2011-05-26T15:53:53.814 -0.003 0.000 0.005 41920 2011-05-27T23:48:53.814 0.004 0.000 -0.006 41934 2011-05-29T03:11:53.815 -0.004 0.000 0.006 41949 2011-05-30T09:01:53.815 -0.004 0.000 0.006 41967 2011-05-31T21:48:53.815 0.002 0.000 0.002 41983 2011-06-02T04:59:53.815 0.007 0.000 0.013 42001 2011-06-03T15:13:53.815 0.004 0.000 -0.001 42017 2011-06-04T23:27:53.815 -0.002 0.000 0.003 42034 2011-06-06T08:47:53.815 0.006 -0.000 -0.011 42052 2011-06-07T21:18:53.815 0.001 -0.000 0.002 42074 2011-06-09T15:28:53.815 0.006 -0.000 -0.002 42094 2011-06-11T07:20:53.815 -0.001 0.000 0.002 42112 2011-06-12T19:09:53.815 0.003 0.000 -0.005 42124 2011-06-13T18:26:53.815 -0.003 -0.000 0.005 42144 2011-06-15T11:03:53.815 -0.002 -0.000 -0.005 42166 2011-06-17T06:53:53.815 0.005 -0.000 0.008 42185 2011-06-18T20:33:53.815 -0.003 0.000 -0.003 42207 2011-06-20T14:33:53.815 -0.004 -0.000 0.008 42224 2011-06-21T23:49:53.815 0.003 0.000 -0.001 42234 2011-06-22T20:51:53.815 0.002 0.000 0.003 42244 2011-06-23T15:55:53.815 0.002 0.000 -0.004 42260 2011-06-24T23:34:53.815 0.001 -0.000 -0.001 42272 2011-06-25T23:16:53.815 -0.000 0.000 0.000 42287 2011-06-27T06:08:53.815 -0.002 -0.000 -0.001 42306 2011-06-28T17:53:53.815 0.001 -0.000 -0.000 42324 2011-06-30T07:01:53.815 0.001 0.000 0.002