2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Nov 9 13:55:50 PST 2010 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 37901 through 39017): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2010 JUL 01 00:01:06.184 2010 OCT 01 01:01:06.182 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_od38058-38154_rec_v1.bsp spk_m_od38152-38230_rec_v1.bsp spk_m_od38229-38327_rec_v1.bsp spk_m_od38325-38412_rec_v1.bsp spk_m_od38411-38488_rec_v1.bsp spk_m_od38486-38570_rec_v1.bsp spk_m_od38568-38666_rec_v1.bsp spk_m_od38664-38743_rec_v1.bsp spk_m_od38742-38820_rec_v1.bsp spk_m_od38811-38918_rec_v1.bsp spk_m_od38917-39000_rec_v1.bsp spk_m_od38998-39087_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_ext24.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 37910 2010-07-01T19:01:53.815 -0.027 -0.000 -0.001 37921 2010-07-02T16:33:53.815 0.009 0.000 -0.002 37934 2010-07-03T19:21:53.815 0.026 0.000 0.002 37948 2010-07-04T21:58:53.815 -0.021 -0.000 0.003 37961 2010-07-06T00:23:53.816 -0.023 0.001 -0.010 37975 2010-07-07T03:06:53.816 0.019 0.000 -0.008 37991 2010-07-08T11:26:53.816 -0.011 0.000 -0.005 38007 2010-07-09T19:21:53.816 -0.015 0.000 -0.006 38017 2010-07-10T14:33:53.816 0.008 -0.000 0.001 38030 2010-07-11T16:16:53.816 0.001 0.000 0.000 38050 2010-07-13T08:33:53.816 -0.003 0.000 -0.000 38058 2010-07-14T00:10:53.816 -0.021 0.000 -0.008 38074 2010-07-15T07:39:53.816 -0.034 0.000 -0.015 38084 2010-07-16T03:58:53.816 0.005 -0.000 -0.001 38096 2010-07-17T02:27:53.816 0.031 0.000 -0.006 38108 2010-07-18T02:38:53.816 0.032 -0.000 0.013 38123 2010-07-19T08:33:53.816 0.047 -0.000 0.019 38140 2010-07-20T18:58:53.816 -0.011 0.000 0.005 38152 2010-07-21T18:26:53.816 -0.022 0.000 0.006 38167 2010-07-23T00:07:53.816 -0.015 -0.000 0.004 38182 2010-07-24T04:27:53.816 0.037 0.000 -0.005 38195 2010-07-25T06:28:53.816 -0.022 -0.000 -0.006 38213 2010-07-26T18:37:53.816 -0.021 -0.000 -0.005 38229 2010-07-28T02:08:53.816 0.017 -0.000 0.006 38244 2010-07-29T08:23:53.816 -0.011 0.000 0.004 38261 2010-07-30T17:18:53.816 0.016 -0.000 0.006 38274 2010-07-31T19:28:53.816 0.024 0.000 -0.004 38291 2010-08-02T05:16:53.816 0.001 0.000 -0.000 38310 2010-08-03T17:48:53.816 -0.005 0.000 -0.002 38325 2010-08-04T23:23:53.816 -0.008 0.000 -0.002 38343 2010-08-06T10:58:53.816 -0.059 0.000 -0.017 38352 2010-08-07T05:27:53.816 0.016 -0.000 0.001 38366 2010-08-08T07:58:53.816 0.022 0.000 -0.006 38382 2010-08-09T15:28:53.816 -0.013 -0.000 0.005 38398 2010-08-11T00:23:53.816 0.015 0.000 0.001 38411 2010-08-12T00:43:53.816 0.011 -0.000 -0.005 38428 2010-08-13T10:53:53.817 -0.019 -0.000 -0.004 38443 2010-08-14T15:58:53.817 0.025 0.000 -0.010 38455 2010-08-15T15:43:53.817 -0.023 -0.000 0.009 38472 2010-08-17T02:59:53.817 -0.001 -0.000 0.000 38486 2010-08-18T06:28:53.817 0.017 0.000 -0.002 38501 2010-08-19T11:43:53.817 -0.031 0.000 -0.009 38513 2010-08-20T11:03:53.817 0.005 0.000 0.002 38528 2010-08-21T15:56:23.817 0.019 0.000 -0.008 38541 2010-08-22T18:38:53.817 0.029 -0.000 0.011 38556 2010-08-24T00:43:53.817 -0.067 -0.000 0.002 38568 2010-08-24T23:48:53.817 0.030 0.000 0.011 38583 2010-08-26T05:38:53.817 -0.035 0.000 -0.013 38596 2010-08-27T07:23:53.817 0.015 -0.000 0.005 38614 2010-08-28T18:08:53.817 0.022 0.000 -0.005 38632 2010-08-30T05:28:53.817 -0.005 0.000 0.002 38644 2010-08-31T05:13:53.817 -0.022 0.000 0.008 38654 2010-09-01T00:58:53.817 -0.004 0.000 0.002 38664 2010-09-01T21:38:53.817 0.013 0.000 0.005 38677 2010-09-02T23:33:53.817 -0.020 0.000 -0.006 38696 2010-09-04T13:18:53.817 -0.026 0.000 -0.003 38711 2010-09-05T19:18:53.817 0.006 -0.000 -0.002 38726 2010-09-07T00:17:53.817 0.056 -0.001 0.019 38742 2010-09-08T07:57:53.817 -0.064 0.001 -0.020 38758 2010-09-09T14:58:53.817 -0.011 0.000 -0.000 38771 2010-09-10T16:09:53.817 -0.008 -0.000 0.003 38784 2010-09-11T19:19:53.817 0.010 -0.000 0.000 38798 2010-09-12T23:23:53.817 -0.016 0.000 0.005 38811 2010-09-14T00:13:53.817 0.044 -0.000 0.014 38831 2010-09-15T16:03:53.817 -0.054 0.000 -0.009 38849 2010-09-17T03:33:53.817 -0.037 0.000 -0.008 38870 2010-09-18T19:58:53.817 0.010 0.000 -0.003 38882 2010-09-19T21:22:53.817 -0.031 -0.000 0.009 38898 2010-09-21T03:53:53.817 0.003 -0.000 0.001 38917 2010-09-22T17:58:53.817 -0.033 0.000 -0.006 38933 2010-09-24T00:43:53.817 0.018 0.000 -0.002 38952 2010-09-25T14:08:53.817 0.023 0.000 -0.005 38966 2010-09-26T17:48:53.817 0.020 -0.000 -0.004 38980 2010-09-27T22:54:53.817 -0.029 -0.000 0.005 38998 2010-09-29T10:33:53.817 0.014 -0.000 -0.003 39014 2010-09-30T17:50:53.817 -0.032 -0.000 -0.002