2001 Mars Odyssey Extended SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, December 5, 2006 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): 2006 JUL 01 00:00:00.000 COVERAGE END TIME (TDB): 2006 OCT 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_od20117-20223_rec_v1.bsp spk_m_od20222-20313_rec_v1.bsp spk_m_od20312-20379_rec_v1.bsp spk_m_od20378-20464_rec_v1.bsp spk_m_od20463-20546_rec_v1.bsp spk_m_od20545-20651_rec_v1.bsp spk_m_od20649-20725_rec_v1.bsp spk_m_od20724-20799_rec_v1.bsp spk_m_od20798-20894_rec_v1.bsp spk_m_od20893-20971_rec_v1.bsp spk_m_od20970-21068_rec_v1.bsp spk_m_od21068-21152_rec_v1.bsp spk_m_od21151-21231_rec_v1.bsp spk_m_od21230-21310_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_ext8.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 20158 2006-07-01T01:58:54.815 0.024 0.000 -0.004 20178 2006-07-02T18:33:54.815 0.008 0.000 0.001 20199 2006-07-04T10:58:54.815 0.022 0.000 -0.005 20222 2006-07-06T09:38:54.816 0.040 -0.000 -0.002 20245 2006-07-08T06:58:54.816 0.006 -0.000 0.000 20268 2006-07-10T04:26:54.816 -0.029 0.000 -0.002 20289 2006-07-11T20:48:54.816 -0.014 0.000 0.003 20312 2006-07-13T18:48:54.816 -0.040 0.000 -0.014 20333 2006-07-15T12:48:54.816 0.004 0.000 0.001 20356 2006-07-17T09:03:54.816 0.034 0.000 -0.012 20378 2006-07-19T05:04:54.816 -0.016 -0.000 -0.004 20396 2006-07-20T17:54:54.816 -0.025 -0.000 0.010 20419 2006-07-22T14:13:54.816 -0.013 0.000 -0.004 20439 2006-07-24T06:13:54.816 -0.015 -0.000 -0.004 20463 2006-07-26T06:18:54.816 -0.061 -0.000 0.025 20480 2006-07-27T15:18:54.816 -0.047 0.000 -0.008 20500 2006-07-29T06:48:54.816 0.016 -0.000 0.003 20522 2006-07-31T01:28:54.816 0.032 -0.000 0.000 20545 2006-08-01T23:28:54.816 -0.003 -0.000 -0.001 20568 2006-08-03T21:28:54.816 0.009 0.000 -0.002 20588 2006-08-05T13:08:54.816 0.009 -0.000 -0.003 20609 2006-08-07T05:58:54.816 0.015 -0.000 0.006 20628 2006-08-08T19:38:54.816 0.036 -0.001 0.011 20649 2006-08-10T13:53:54.816 -0.021 -0.000 0.009 20670 2006-08-12T05:58:54.816 -0.044 0.000 -0.002 20691 2006-08-14T00:05:54.817 -0.029 0.000 -0.010 20708 2006-08-15T08:58:54.817 0.021 0.000 -0.002 20724 2006-08-16T16:37:54.817 0.004 0.000 -0.000 20744 2006-08-18T09:07:54.817 0.037 0.000 0.002 20762 2006-08-19T19:48:54.817 0.001 -0.001 0.000 20784 2006-08-21T14:58:54.817 0.033 0.000 -0.010 20798 2006-08-22T20:18:54.817 -0.020 -0.000 0.008 20821 2006-08-24T16:38:54.817 -0.003 0.000 -0.001 20840 2006-08-26T05:58:54.817 -0.027 -0.000 -0.003 20855 2006-08-27T12:44:54.817 -0.031 -0.000 0.008 20875 2006-08-29T03:07:54.817 0.042 -0.000 0.004 20893 2006-08-30T14:43:54.817 -0.038 0.000 -0.005 20908 2006-08-31T20:38:54.817 -0.011 0.000 -0.004 20931 2006-09-02T18:48:54.817 0.018 0.000 -0.002 20954 2006-09-04T15:58:54.817 -0.001 0.000 -0.000 20970 2006-09-05T22:43:54.817 0.005 -0.000 -0.001 20991 2006-09-07T15:58:54.817 -0.021 -0.000 0.008 21007 2006-09-08T23:58:54.817 -0.018 0.000 -0.002 21027 2006-09-10T15:28:54.817 0.026 -0.000 0.001 21050 2006-09-12T13:27:54.817 0.002 0.000 0.001 21068 2006-09-14T00:10:54.817 0.019 -0.000 -0.006 21079 2006-09-14T22:13:54.817 0.051 0.000 0.002 21101 2006-09-16T19:07:54.817 -0.004 -0.000 0.001 21114 2006-09-17T19:18:54.817 -0.038 -0.000 0.003 21136 2006-09-19T14:43:54.817 -0.004 -0.000 0.001 21151 2006-09-20T21:53:54.817 0.037 0.000 -0.014 21170 2006-09-22T10:43:54.817 -0.009 0.000 -0.003 21192 2006-09-24T05:08:54.817 0.031 0.000 -0.012 21212 2006-09-25T21:31:54.817 0.010 -0.000 0.004 21230 2006-09-27T08:23:54.817 -0.026 -0.000 0.007 21251 2006-09-29T02:18:54.817 -0.002 -0.000 -0.000 21274 2006-09-30T23:08:54.817 -0.023 -0.000 0.009