2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Feb 18 16:50:49 PST 2011 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 39018 through 40135): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2010 OCT 01 00:01:06.182 2011 JAN 01 01:01:06.183 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_od39086-39166_rec_v1.bsp spk_m_od39165-39264_rec_v1.bsp spk_m_od39263-39348_rec_v1.bsp spk_m_od39347-39430_rec_v1.bsp spk_m_od39427-39507_rec_v1.bsp spk_m_od39505-39600_rec_v1.bsp spk_m_od39599-39665_rec_v1.bsp spk_m_od39664-39765_rec_v1.bsp spk_m_od39763-39851_rec_v1.bsp spk_m_od39850-39936_rec_v1.bsp spk_m_od39935-40007_rec_v1.bsp spk_m_od40004-40111_rec_v1.bsp spk_m_od40109-40194_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_ext25.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 39033 2010-10-02T06:08:53.817 0.020 0.000 -0.005 39048 2010-10-03T13:03:53.817 -0.038 0.000 -0.002 39069 2010-10-05T06:13:53.817 -0.014 -0.000 -0.004 39086 2010-10-06T15:38:53.817 0.008 -0.000 0.002 39105 2010-10-08T05:46:23.817 0.007 -0.000 0.000 39120 2010-10-09T10:48:53.817 -0.004 0.000 -0.001 39137 2010-10-10T20:26:23.817 -0.019 0.000 -0.004 39152 2010-10-12T02:58:53.817 -0.022 -0.000 0.004 39165 2010-10-13T04:41:23.817 0.041 0.000 -0.008 39182 2010-10-14T12:23:53.817 -0.020 -0.000 0.004 39195 2010-10-15T14:03:53.817 0.004 0.000 -0.001 39209 2010-10-16T17:44:53.817 0.033 0.000 -0.007 39221 2010-10-17T19:09:53.817 0.013 0.000 -0.001 39231 2010-10-18T13:54:53.817 -0.038 0.000 -0.001 39245 2010-10-19T18:01:53.817 0.023 -0.000 0.005 39263 2010-10-21T04:43:53.817 -0.017 -0.000 0.003 39284 2010-10-22T21:58:53.817 0.017 0.000 -0.003 39299 2010-10-24T05:23:53.817 -0.028 -0.000 0.002 39319 2010-10-25T19:16:53.817 -0.010 -0.000 0.002 39332 2010-10-26T21:55:53.817 -0.015 0.000 -0.003 39347 2010-10-28T03:23:53.817 0.024 0.000 0.003 39365 2010-10-29T14:01:23.817 0.053 -0.000 -0.007 39380 2010-10-30T20:38:53.817 0.003 -0.000 0.000 39395 2010-11-01T03:04:53.817 -0.030 -0.000 0.000 39413 2010-11-02T14:42:53.817 0.040 0.000 -0.001 39427 2010-11-03T17:38:53.817 -0.026 0.000 -0.004 39436 2010-11-04T10:33:53.817 -0.052 -0.001 0.009 39452 2010-11-05T19:45:53.817 0.004 0.000 0.000 39467 2010-11-06T23:37:53.817 -0.005 0.000 0.001 39488 2010-11-08T17:38:53.817 0.030 -0.000 -0.004 39505 2010-11-10T04:13:53.817 -0.019 0.000 -0.003 39523 2010-11-11T14:48:53.817 0.008 0.000 -0.001 39539 2010-11-12T22:10:53.817 -0.023 -0.000 0.004 39557 2010-11-14T10:26:53.817 0.003 0.001 0.000 39569 2010-11-15T10:28:53.817 0.004 -0.000 0.001 39587 2010-11-16T21:28:53.817 -0.016 0.000 0.002 39599 2010-11-17T21:23:53.817 -0.006 0.000 -0.000 39612 2010-11-18T23:58:53.817 -0.010 0.000 -0.001 39632 2010-11-20T15:33:53.817 -0.035 -0.000 -0.001 39647 2010-11-21T21:02:53.817 0.039 0.000 0.005 39664 2010-11-23T05:05:53.817 0.006 -0.000 -0.001 39681 2010-11-24T15:05:53.817 -0.006 0.000 0.001 39701 2010-11-26T06:39:53.817 0.012 -0.000 -0.002 39720 2010-11-27T19:35:53.816 0.012 0.000 0.000 39733 2010-11-28T22:38:53.816 -0.006 0.000 -0.001 39749 2010-11-30T05:43:53.816 -0.022 0.001 0.003 39763 2010-12-01T10:23:53.816 0.011 0.000 0.002 39781 2010-12-02T21:16:53.816 -0.013 0.000 -0.001 39797 2010-12-04T05:30:53.816 0.002 0.000 0.000 39813 2010-12-05T11:23:53.816 0.007 0.000 0.000 39829 2010-12-06T20:38:53.816 0.013 0.000 0.003 39850 2010-12-08T13:23:53.816 0.005 -0.000 -0.001 39864 2010-12-09T17:26:53.816 0.010 -0.000 0.002 39878 2010-12-10T21:03:53.816 -0.007 0.000 -0.001 39892 2010-12-12T00:23:53.816 -0.004 -0.000 0.000 39909 2010-12-13T10:18:53.816 -0.020 0.000 -0.003 39922 2010-12-14T10:48:53.816 0.029 -0.000 0.002 39935 2010-12-15T12:38:53.816 -0.007 0.000 0.000 39951 2010-12-16T21:03:53.816 -0.009 0.000 0.001 39971 2010-12-18T12:38:53.816 -0.000 -0.000 0.000 39986 2010-12-19T17:56:53.816 0.010 0.000 -0.003 40004 2010-12-21T05:25:53.816 0.030 -0.000 -0.010 40017 2010-12-22T06:40:53.816 -0.015 0.000 0.001 40031 2010-12-23T11:50:53.816 0.035 0.000 0.012 40044 2010-12-24T13:11:53.816 0.011 -0.000 0.002 40060 2010-12-25T20:56:53.816 -0.040 0.000 -0.013 40079 2010-12-27T10:00:53.816 0.031 -0.000 -0.005 40097 2010-12-28T20:58:53.816 0.010 0.000 -0.003 40109 2010-12-29T22:03:53.816 0.001 -0.000 0.000 40130 2010-12-31T14:43:53.816 -0.018 0.000 0.005