2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Aug 26 12:29:40 PDT 2008 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 27931 through 29035): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2008 APR 01 00:01:05.185 2008 JUL 01 01:01:05.184 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_od28033-28131_rec_v1.bsp spk_m_od28130-28202_rec_v1.bsp spk_m_od28202-28283_rec_v1.bsp spk_m_od28283-28384_rec_v1.bsp spk_m_od28383-28459_rec_v1.bsp spk_m_od28458-28538_rec_v1.bsp spk_m_od28537-28640_rec_v1.bsp spk_m_od28639-28716_rec_v1.bsp spk_m_od28716-28786_rec_v1.bsp spk_m_od28786-28893_rec_v1.bsp spk_m_od28892-28974_rec_v1.bsp spk_m_od28974-29036_rec_v1.bsp spk_m_od29035-29132_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_ext15.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 27931 2008-04-01T02:28:54.814 -0.016 -0.000 -0.007 27945 2008-04-02T07:02:54.814 0.013 0.001 -0.006 27965 2008-04-03T21:15:54.814 -0.007 -0.000 -0.001 27985 2008-04-05T12:58:54.814 -0.002 -0.000 -0.001 28001 2008-04-06T20:58:54.814 0.011 0.000 0.004 28019 2008-04-08T09:33:54.814 0.003 0.000 -0.001 28033 2008-04-09T12:58:54.814 0.001 0.000 -0.000 28052 2008-04-11T01:13:54.814 -0.007 0.000 -0.002 28070 2008-04-12T12:58:54.814 -0.003 -0.000 -0.002 28091 2008-04-14T06:43:54.814 0.006 0.000 0.003 28110 2008-04-15T19:48:54.814 0.010 0.000 0.001 28130 2008-04-17T11:43:54.814 -0.006 -0.000 -0.003 28152 2008-04-19T06:47:54.814 -0.000 0.000 0.000 28171 2008-04-20T20:13:54.814 0.008 -0.000 -0.001 28183 2008-04-21T21:23:54.814 -0.009 0.000 0.005 28202 2008-04-23T09:43:54.814 -0.005 -0.000 -0.001 28225 2008-04-25T07:05:54.814 -0.002 -0.000 -0.000 28244 2008-04-26T20:43:54.814 0.001 0.000 0.000 28261 2008-04-28T06:24:54.814 0.008 0.000 0.003 28283 2008-04-30T01:45:54.814 0.005 -0.000 0.001 28304 2008-05-01T19:16:54.814 0.002 -0.000 0.000 28326 2008-05-03T14:45:54.814 0.000 -0.000 0.000 28345 2008-05-05T05:08:54.814 -0.011 -0.000 0.000 28365 2008-05-06T19:58:54.814 0.007 0.000 0.003 28383 2008-05-08T08:28:54.814 -0.003 0.000 0.001 28405 2008-05-10T03:38:54.814 -0.010 0.000 -0.001 28425 2008-05-11T18:46:54.814 0.012 -0.000 0.006 28437 2008-05-12T18:50:54.814 0.000 0.000 0.000 28458 2008-05-14T11:41:54.814 0.001 -0.000 0.000 28474 2008-05-15T19:18:54.814 0.008 0.000 0.002 28498 2008-05-17T18:43:54.814 -0.015 -0.000 -0.004 28521 2008-05-19T16:58:54.814 0.005 0.000 0.000 28537 2008-05-21T00:23:54.814 0.000 0.000 0.000 28555 2008-05-22T11:38:54.814 -0.006 -0.000 -0.003 28575 2008-05-24T03:43:54.814 -0.005 0.000 0.000 28598 2008-05-26T00:32:54.814 -0.000 0.000 -0.000 28618 2008-05-27T15:55:54.815 -0.012 0.000 -0.004 28639 2008-05-29T09:28:54.815 0.034 0.000 0.014 28659 2008-05-31T00:58:54.815 0.008 0.000 0.003 28680 2008-06-01T18:26:54.815 0.022 0.000 0.007 28701 2008-06-03T11:58:54.815 -0.019 -0.000 -0.007 28716 2008-06-04T17:33:54.815 0.009 0.001 0.010 28721 2008-06-05T03:28:54.815 -0.227 0.004 0.020 28743 2008-06-06T22:58:54.815 0.002 -0.000 0.001 28765 2008-06-08T18:26:54.815 -0.004 0.000 -0.001 28786 2008-06-10T11:58:54.815 -0.001 0.000 -0.000 28808 2008-06-12T07:26:54.815 -0.010 -0.000 -0.004 28830 2008-06-14T02:55:54.815 0.003 -0.000 0.001 28852 2008-06-15T22:25:54.815 -0.007 -0.000 -0.003 28873 2008-06-17T15:58:54.815 0.003 -0.000 0.001 28892 2008-06-19T05:28:54.815 -0.007 -0.000 -0.003 28911 2008-06-20T19:03:54.815 -0.004 0.000 -0.002 28931 2008-06-22T10:32:54.815 -0.007 -0.000 -0.002 28953 2008-06-24T06:00:54.815 -0.004 0.000 -0.002 28974 2008-06-25T23:31:54.815 0.011 -0.000 0.004 28996 2008-06-27T18:59:54.815 0.004 0.000 0.001 29017 2008-06-29T12:33:54.815 -0.019 -0.000 -0.008 29035 2008-07-01T00:03:54.815 0.010 0.000 0.003