2001 Mars Odyssey Extended SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, May 5, 2005 Objects in the Ephemeris -------------------------------------------------------- This file contains ephemeris data for 2001 Mars Odyssey (M01) spacecraft. NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Extended phase of the M01 mission: COVERAGE BEGIN TIME (TDB): 2005 JAN 01 00:00:00.000 COVERAGE END TIME (TDB): 2005 APR 01 01:00:00.000 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by M01 NAV during Extended phase of the mission. The file was created by NAIF for archiving with 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 (FIS/DOM) by M01 NAV. The list of the original files data from which has been merged into this file is provided in the 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 coverage immediately precede and follow it. The times and magnitudes of these discontinuities are provided in the Appendix 2 of these comments. Usage -------------------------------------------------------- This file should be used together with DE405 planetary 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, bsemenov@spice.jpl.nasa.gov or M01 NAV Team Lead: Robert A. Mase (818)-354-8990 Robert.A.Mase@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_od13503-13580_rec_v1.bsp spk_m_od13579-13675_rec_v1.bsp spk_m_od13674-13743_rec_v1.bsp spk_m_od13742-13829_rec_v1.bsp spk_m_od13828-13916_rec_v1.bsp spk_m_od13915-14001_rec_v1.bsp spk_m_od14001-14089_rec_v1.bsp spk_m_od14088-14170_rec_v1.bsp spk_m_od14169-14262_rec_v1.bsp spk_m_od14262-14345_rec_v1.bsp spk_m_od14344-14425_rec_v1.bsp spk_m_od14424-14511_rec_v1.bsp spk_m_od14509-14592_rec_v1.bsp spk_m_od14591-14682_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_ext2.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 13539 2005-01-02T03:49:55.816 0.018 -0.000 0.007 13558 2005-01-03T18:11:55.815 0.001 0.000 -0.000 13579 2005-01-05T09:43:55.815 -0.001 0.000 0.000 13602 2005-01-07T07:11:25.815 -0.002 -0.000 0.000 13626 2005-01-09T07:44:55.815 0.004 -0.000 0.002 13650 2005-01-11T06:22:55.815 -0.003 0.000 0.002 13674 2005-01-13T06:37:55.815 0.012 -0.000 0.005 13696 2005-01-15T02:05:55.815 0.008 0.000 0.003 13720 2005-01-17T01:32:55.815 -0.006 0.000 -0.002 13742 2005-01-18T20:58:55.815 -0.001 0.000 -0.000 13765 2005-01-20T17:23:55.815 0.004 0.000 -0.001 13786 2005-01-22T10:53:55.815 -0.014 -0.000 0.003 13805 2005-01-24T01:28:55.815 0.010 -0.000 0.004 13828 2005-01-25T22:58:55.815 0.004 -0.000 0.002 13850 2005-01-27T18:26:55.815 -0.003 -0.000 -0.001 13874 2005-01-29T17:48:55.815 0.009 0.000 0.003 13892 2005-01-31T06:08:55.815 -0.003 0.000 -0.000 13915 2005-02-02T02:43:55.815 0.007 -0.000 0.001 13938 2005-02-03T23:18:55.815 0.015 0.000 -0.005 13955 2005-02-05T10:13:55.815 -0.016 0.000 -0.006 13979 2005-02-07T08:18:55.815 -0.008 0.000 0.002 14001 2005-02-09T03:38:55.815 -0.013 -0.000 -0.000 14022 2005-02-10T22:43:55.814 -0.003 -0.000 -0.002 14044 2005-02-12T17:53:55.814 0.001 -0.000 0.001 14066 2005-02-14T13:18:55.814 -0.002 -0.000 -0.001 14088 2005-02-16T08:43:55.814 0.003 -0.000 0.001 14111 2005-02-18T05:43:55.814 -0.006 -0.000 0.003 14125 2005-02-19T09:53:55.814 -0.007 -0.000 -0.003 14148 2005-02-21T07:23:55.814 -0.001 -0.000 -0.000 14169 2005-02-23T00:58:55.814 0.003 -0.000 0.003 14192 2005-02-24T22:18:55.814 -0.008 0.000 -0.004 14216 2005-02-26T21:48:55.814 0.008 -0.000 0.005 14238 2005-02-28T17:13:55.814 -0.016 -0.000 -0.008 14262 2005-03-02T15:28:55.814 -0.000 0.000 0.000 14285 2005-03-04T14:08:55.814 -0.025 0.000 -0.015 14305 2005-03-06T05:38:55.814 -0.004 -0.000 -0.002 14323 2005-03-07T17:13:55.814 0.020 0.000 0.011 14344 2005-03-09T10:43:55.814 -0.010 0.000 -0.006 14363 2005-03-10T23:58:55.814 0.005 -0.000 -0.000 14382 2005-03-12T12:36:55.814 -0.007 -0.000 0.000 14402 2005-03-14T05:23:55.814 0.003 0.000 0.002 14424 2005-03-16T00:48:55.814 0.005 0.000 0.003 14448 2005-03-18T00:13:55.814 -0.010 -0.000 -0.006 14469 2005-03-19T18:13:55.814 0.002 -0.000 0.002 14492 2005-03-21T13:48:55.814 0.002 -0.000 0.001 14509 2005-03-23T00:48:55.814 -0.010 -0.000 -0.007 14530 2005-03-24T18:18:55.814 0.003 0.000 0.002 14548 2005-03-26T05:53:55.814 -0.002 -0.000 -0.001 14568 2005-03-27T21:28:55.814 0.005 -0.000 0.004 14591 2005-03-29T18:43:55.814 -0.004 0.000 -0.002 14616 2005-03-31T20:28:55.814 -0.010 -0.000 -0.010