2001 Mars Odyssey Mapping SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, April 29, 2003 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 Mapping phase of the M01 mission: COVERAGE BEGIN TIME (TDB): 2003 JAN 01 00:00:00.000 COVERAGE END TIME (TDB): 2003 APR 01 01:00:00.000 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by M01 NAV during Mapping 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_od04564-04668_rec_v1.bsp spk_m_od04668-04749_rec_v1.bsp spk_m_od04749-04836_rec_v1.bsp spk_m_od04836-04920_rec_v1.bsp spk_m_od04918-05006_rec_v1.bsp spk_m_od05007-05075_rec_v1.bsp spk_m_od05074-05151_rec_v1.bsp spk_m_od05151-05240_rec_v1.bsp spk_m_od05240-05326_rec_v1.bsp spk_m_od05325-05433_rec_v1.bsp spk_m_od05432-05519_rec_v1.bsp spk_m_od05519-05601_rec_v1.bsp spk_m_od05601-05685_rec_v1.bsp spk_m_od05685-05748_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_map5.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 4648 2003-01-01T05:06:55.816 -0.005 0.000 -0.006 4667 2003-01-02T18:47:55.816 -0.000 0.000 -0.000 4691 2003-01-04T17:03:55.815 -0.006 -0.000 0.006 4713 2003-01-06T13:13:55.815 -0.001 0.000 -0.000 4726 2003-01-07T14:48:55.815 0.003 0.000 0.000 4748 2003-01-09T10:28:55.815 0.001 0.000 0.000 4772 2003-01-11T09:53:55.815 0.003 0.000 0.002 4796 2003-01-13T09:58:55.815 -0.001 0.000 -0.000 4823 2003-01-15T13:33:55.815 -0.001 0.000 0.000 4835 2003-01-16T14:28:55.815 0.001 -0.000 0.001 4858 2003-01-18T12:03:55.815 -0.002 0.000 -0.002 4881 2003-01-20T09:13:55.815 -0.000 -0.000 -0.000 4903 2003-01-22T04:48:55.815 0.001 0.000 0.001 4918 2003-01-23T09:13:55.815 -0.000 0.000 0.000 4940 2003-01-25T06:13:55.815 0.001 -0.000 0.001 4964 2003-01-27T05:13:55.815 0.001 0.000 0.001 4982 2003-01-28T16:53:55.815 -0.002 0.000 -0.002 5006 2003-01-30T16:18:55.815 0.002 -0.000 0.002 5019 2003-01-31T17:58:55.815 0.001 -0.000 0.000 5043 2003-02-02T17:13:55.815 0.006 -0.000 0.003 5057 2003-02-03T21:18:55.815 -0.007 -0.000 -0.007 5073 2003-02-05T04:43:55.815 0.000 -0.000 0.001 5097 2003-02-07T04:43:55.815 -0.004 -0.000 -0.000 5116 2003-02-08T17:38:55.815 0.003 -0.001 0.004 5128 2003-02-09T17:18:55.815 0.003 0.000 0.002 5150 2003-02-11T12:43:55.814 -0.005 -0.000 -0.004 5174 2003-02-13T12:08:55.814 0.002 0.000 0.002 5193 2003-02-15T01:38:55.814 0.002 0.000 0.000 5216 2003-02-16T23:08:55.814 -0.000 0.000 -0.000 5239 2003-02-18T20:36:55.814 -0.001 -0.000 -0.001 5262 2003-02-20T18:04:55.814 0.002 -0.000 0.004 5277 2003-02-21T23:28:55.814 -0.004 -0.000 -0.001 5301 2003-02-23T22:43:55.814 -0.001 -0.000 0.000 5324 2003-02-25T20:58:55.814 -0.002 0.000 -0.002 5348 2003-02-27T20:28:55.814 -0.001 0.000 -0.001 5372 2003-03-01T19:58:55.814 0.003 0.000 0.001 5395 2003-03-03T16:58:55.814 -0.003 -0.000 -0.003 5410 2003-03-04T22:38:55.814 -0.002 -0.000 -0.003 5431 2003-03-06T16:13:55.814 0.000 0.000 0.000 5452 2003-03-08T09:58:55.814 -0.001 0.000 -0.001 5478 2003-03-10T12:28:55.814 0.001 0.000 -0.000 5500 2003-03-12T08:28:55.814 0.001 0.000 0.001 5518 2003-03-13T20:08:55.814 -0.001 0.000 -0.001 5541 2003-03-15T17:28:55.814 0.001 -0.000 0.001 5563 2003-03-17T12:53:55.814 -0.002 -0.000 -0.002 5584 2003-03-19T06:13:55.814 -0.002 -0.000 -0.001 5600 2003-03-20T14:03:55.814 0.007 -0.000 0.008 5621 2003-03-22T07:33:55.814 0.001 -0.000 0.003 5638 2003-03-23T16:33:55.814 0.004 0.000 -0.001 5661 2003-03-25T14:03:55.814 0.002 -0.000 -0.000 5684 2003-03-27T11:43:55.814 -0.002 -0.000 -0.001 5707 2003-03-29T09:13:55.814 -0.002 -0.000 -0.001 5730 2003-03-31T06:58:55.814 0.001 0.000 0.001