2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu May 8 10:46:31 PDT 2014 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 53451 through 54543): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2014 JAN 01 00:01:07.183 2014 APR 01 01:01:07.185 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_od53350-53461_rec_v1.bsp spk_m_od53459-53551_rec_v1.bsp spk_m_od53549-53617_rec_v1.bsp spk_m_od53615-53714_rec_v1.bsp spk_m_od53713-53794_rec_v1.bsp spk_m_od53792-53887_rec_v1.bsp spk_m_od53886-53964_rec_v1.bsp spk_m_od53962-54042_rec_v1.bsp spk_m_od54041-54136_rec_v1.bsp spk_m_od54135-54224_rec_v1.bsp spk_m_od54222-54300_rec_v1.bsp spk_m_od54298-54383_rec_v1.bsp spk_m_od54381-54464_rec_v1.bsp spk_m_od54463-54551_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_ext38.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 53458 2014-01-01T16:38:52.816 -0.003 -0.000 -0.004 53465 2014-01-02T05:32:52.816 -0.000 0.000 0.000 53482 2014-01-03T15:08:52.816 -0.000 0.000 0.001 53501 2014-01-05T04:40:52.815 -0.002 -0.000 0.003 53515 2014-01-06T08:17:52.815 -0.003 -0.000 0.004 53532 2014-01-07T17:54:22.815 0.007 0.000 -0.009 53548 2014-01-09T02:24:07.815 -0.004 -0.000 -0.006 53563 2014-01-10T07:08:52.815 -0.003 -0.000 0.004 53579 2014-01-11T16:10:37.815 0.002 0.000 0.001 53599 2014-01-13T06:12:22.815 -0.000 -0.000 0.001 53614 2014-01-14T12:47:52.815 0.001 -0.000 0.002 53628 2014-01-15T15:28:52.815 0.001 -0.000 -0.002 53640 2014-01-16T15:11:52.815 -0.001 0.000 0.001 53651 2014-01-17T12:56:52.815 -0.001 0.000 0.001 53662 2014-01-18T10:39:52.815 0.001 0.000 -0.001 53677 2014-01-19T17:34:52.815 0.001 -0.000 0.001 53687 2014-01-20T12:01:52.815 0.000 0.000 -0.000 53700 2014-01-21T13:39:27.815 -0.001 -0.000 0.002 53712 2014-01-22T14:50:47.815 0.003 -0.000 0.001 53732 2014-01-24T06:24:22.815 -0.005 0.000 -0.001 53750 2014-01-25T17:39:22.815 0.004 -0.000 0.005 53769 2014-01-27T06:00:47.815 0.004 0.000 -0.005 53781 2014-01-28T05:41:52.815 -0.001 -0.000 0.001 53791 2014-01-29T02:18:52.815 -0.003 -0.000 -0.003 53808 2014-01-30T11:00:52.815 -0.001 0.000 0.001 53820 2014-01-31T10:44:52.815 0.002 0.000 -0.002 53832 2014-02-01T10:26:52.815 -0.001 -0.000 0.002 53848 2014-02-02T18:01:52.815 0.001 0.000 -0.001 53868 2014-02-04T09:33:17.815 -0.003 0.000 0.003 53885 2014-02-05T19:57:47.815 -0.003 0.000 -0.003 53901 2014-02-07T04:02:47.815 -0.001 0.000 -0.001 53920 2014-02-08T16:16:57.815 -0.001 -0.000 0.002 53931 2014-02-09T13:59:02.815 -0.005 0.000 0.005 53946 2014-02-10T19:36:47.814 0.007 -0.000 -0.008 53961 2014-02-12T02:02:52.814 0.005 0.000 0.005 53977 2014-02-13T08:49:52.814 0.001 -0.000 -0.001 53989 2014-02-14T08:32:52.814 0.004 -0.000 -0.004 54007 2014-02-15T20:05:52.814 -0.005 -0.000 0.005 54024 2014-02-17T05:38:52.814 -0.000 0.000 0.000 54040 2014-02-18T14:11:52.814 0.001 -0.000 0.001 54061 2014-02-20T06:53:52.814 0.002 0.000 -0.002 54076 2014-02-21T13:46:52.814 0.002 0.000 0.001 54089 2014-02-22T14:03:52.814 -0.008 0.000 0.007 54100 2014-02-23T11:49:52.814 0.002 -0.000 -0.002 54115 2014-02-24T17:24:52.814 -0.003 -0.000 0.003 54134 2014-02-26T06:43:52.814 0.012 0.000 -0.009 54156 2014-02-28T02:23:52.814 0.006 0.000 -0.005 54172 2014-03-01T10:00:52.814 -0.001 -0.000 0.001 54187 2014-03-02T15:25:52.814 -0.001 0.000 0.001 54206 2014-03-04T05:10:52.814 0.005 0.000 -0.003 54221 2014-03-05T11:28:52.814 0.002 0.000 0.001 54242 2014-03-07T04:18:52.814 0.006 0.000 -0.005 54253 2014-03-08T02:02:52.814 -0.007 0.000 0.005 54265 2014-03-09T01:43:52.814 0.002 0.000 -0.001 54280 2014-03-10T07:23:52.814 -0.001 -0.000 0.001 54297 2014-03-11T17:31:52.814 0.010 -0.000 0.004 54317 2014-03-13T08:28:32.814 0.002 -0.000 -0.001 54333 2014-03-14T17:32:52.814 -0.003 -0.000 0.001 54351 2014-03-16T04:32:22.814 0.001 -0.000 0.000 54369 2014-03-17T15:13:26.814 -0.002 0.000 0.001 54380 2014-03-18T13:24:07.814 0.007 -0.000 0.002 54399 2014-03-20T03:37:17.814 0.012 0.000 0.002 54417 2014-03-21T14:06:22.814 0.004 0.000 -0.001 54432 2014-03-22T19:47:14.814 -0.011 -0.000 0.002 54448 2014-03-24T03:22:52.814 0.018 -0.001 -0.003 54462 2014-03-25T06:28:52.814 -0.012 -0.000 0.005 54475 2014-03-26T08:43:52.814 0.007 0.000 -0.001 54491 2014-03-27T16:28:52.814 -0.011 0.000 -0.001 54511 2014-03-29T07:48:52.814 -0.008 0.000 0.001 54531 2014-03-30T23:41:52.814 -0.013 -0.000 -0.005