2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Apr 27 10:41:30 PDT 2012 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 44569 through 45674): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2012 JAN 01 00:01:06.183 2012 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_od44527-44626_rec_v1.bsp spk_m_od44624-44707_rec_v1.bsp spk_m_od44705-44789_rec_v1.bsp spk_m_od44787-44879_rec_v1.bsp spk_m_od44877-44954_rec_v1.bsp spk_m_od44952-45050_rec_v1.bsp spk_m_od45048-45131_rec_v1.bsp spk_m_od45130-45217_rec_v1.bsp spk_m_od45214-45295_rec_v1.bsp spk_m_od45293-45389_rec_v1.bsp spk_m_od45387-45467_rec_v1.bsp spk_m_od45466-45555_rec_v1.bsp spk_m_od45553-45638_rec_v1.bsp spk_m_od45637-45724_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_ext30.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 44573 2012-01-01T08:34:53.816 -0.001 -0.000 0.002 44591 2012-01-02T20:07:53.816 0.001 0.000 -0.002 44611 2012-01-04T11:31:23.815 0.002 0.000 -0.004 44624 2012-01-05T14:33:53.815 -0.000 -0.000 -0.001 44645 2012-01-07T06:48:53.815 0.000 0.000 -0.001 44662 2012-01-08T16:23:53.815 -0.002 -0.000 0.006 44673 2012-01-09T13:59:53.815 0.004 0.000 -0.008 44687 2012-01-10T17:39:38.815 -0.002 -0.000 0.004 44705 2012-01-12T06:47:53.815 0.000 0.000 -0.000 44723 2012-01-13T16:49:53.815 0.001 0.000 -0.002 44741 2012-01-15T04:27:53.815 0.000 0.000 -0.000 44758 2012-01-16T13:54:53.815 0.000 -0.000 -0.000 44771 2012-01-17T15:43:53.815 -0.003 -0.000 0.006 44787 2012-01-19T00:53:53.815 -0.001 0.000 0.001 44807 2012-01-20T14:43:53.815 0.001 -0.000 -0.002 44826 2012-01-22T04:23:53.815 0.006 -0.000 -0.011 44843 2012-01-23T13:58:53.815 -0.003 0.000 0.006 44862 2012-01-25T03:30:53.815 -0.001 0.000 0.002 44877 2012-01-26T10:23:53.815 -0.006 -0.000 -0.007 44899 2012-01-28T04:28:53.815 -0.005 -0.000 0.008 44918 2012-01-29T18:02:58.815 0.004 -0.000 -0.006 44938 2012-01-31T09:28:53.815 -0.001 0.000 0.001 44952 2012-02-01T14:27:53.815 0.001 -0.000 0.002 44973 2012-02-03T06:27:53.815 -0.003 -0.000 0.003 44989 2012-02-04T15:44:53.815 0.005 0.000 0.003 45001 2012-02-05T14:02:53.815 -0.004 0.000 0.005 45014 2012-02-06T15:43:53.815 0.002 0.000 -0.003 45029 2012-02-07T21:08:53.815 -0.002 -0.000 0.002 45048 2012-02-09T12:14:53.815 0.001 -0.000 0.001 45063 2012-02-10T16:28:53.814 0.001 -0.000 -0.001 45074 2012-02-11T14:22:53.814 -0.003 0.000 0.003 45091 2012-02-12T23:43:53.814 0.006 0.000 -0.006 45109 2012-02-14T11:37:53.814 -0.002 0.000 0.002 45130 2012-02-16T04:38:53.814 -0.004 0.000 0.003 45145 2012-02-17T10:33:53.814 -0.000 0.000 -0.000 45167 2012-02-19T05:58:53.814 0.005 -0.000 -0.005 45185 2012-02-20T17:26:53.814 -0.005 0.000 0.004 45204 2012-02-22T07:15:53.814 -0.000 -0.000 0.001 45214 2012-02-23T04:03:53.814 -0.006 -0.000 -0.005 45232 2012-02-24T14:28:53.814 -0.005 -0.000 0.005 45248 2012-02-25T21:42:53.814 0.002 -0.000 -0.001 45265 2012-02-27T09:15:53.814 -0.003 -0.000 0.001 45280 2012-02-28T13:25:53.814 -0.011 0.000 0.006 45293 2012-02-29T16:08:53.814 0.010 -0.000 0.005 45313 2012-03-02T06:08:53.814 -0.010 -0.000 0.004 45328 2012-03-03T11:46:53.814 0.001 0.000 -0.001 45346 2012-03-04T23:50:53.814 -0.003 -0.000 0.001 45362 2012-03-06T08:28:53.814 0.002 -0.000 0.001 45377 2012-03-07T13:01:23.814 0.014 -0.000 -0.006 45387 2012-03-08T09:23:53.814 -0.004 0.000 -0.002 45402 2012-03-09T15:23:53.814 -0.007 0.000 -0.003 45422 2012-03-11T05:58:53.814 0.012 -0.000 -0.004 45434 2012-03-12T05:43:53.814 0.008 0.000 -0.002 45450 2012-03-13T13:25:53.814 0.010 0.000 -0.000 45466 2012-03-14T21:20:53.814 -0.018 0.000 -0.007 45484 2012-03-16T08:58:53.814 0.023 -0.001 0.009 45500 2012-03-17T16:33:53.814 0.000 -0.000 0.000 45519 2012-03-19T05:05:53.814 -0.009 0.000 0.003 45537 2012-03-20T17:13:53.814 0.010 -0.000 -0.001 45553 2012-03-22T01:28:53.814 0.011 0.000 0.004 45566 2012-03-23T03:48:53.814 0.014 -0.000 -0.004 45578 2012-03-24T02:33:53.814 0.014 0.000 0.005 45593 2012-03-25T08:23:18.814 0.009 -0.001 0.003 45603 2012-03-26T03:13:53.814 0.003 -0.000 -0.001 45615 2012-03-27T02:44:53.814 -0.009 -0.000 0.003 45622 2012-03-27T16:43:53.814 0.017 0.000 -0.006 45629 2012-03-28T08:13:53.814 0.006 0.000 -0.002 45637 2012-03-28T23:28:53.814 -0.019 -0.000 -0.005 45643 2012-03-29T11:28:53.814 -0.020 -0.000 -0.002 45658 2012-03-30T15:58:53.814 0.005 0.000 -0.001