2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Apr 26 10:59:19 PDT 2007 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 22392 through 23484): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 JAN 01 00:01:05.183 2007 APR 01 01:01:05.185 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_od22341-22428_rec_v1.bsp spk_m_od22427-22510_rec_v1.bsp spk_m_od22508-22593_rec_v1.bsp spk_m_od22590-22678_rec_v1.bsp spk_m_od22676-22767_rec_v1.bsp spk_m_od22765-22859_rec_v1.bsp spk_m_od22858-22945_rec_v1.bsp spk_m_od22943-23030_rec_v1.bsp spk_m_od23029-23115_rec_v1.bsp spk_m_od23113-23204_rec_v1.bsp spk_m_od23202-23263_rec_v1.bsp spk_m_od23262-23367_rec_v1.bsp spk_m_od23366-23458_rec_v1.bsp spk_m_od23456-23538_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_ext10.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 22402 2007-01-01T21:53:54.816 -0.029 0.000 -0.003 22427 2007-01-03T23:11:54.815 0.002 -0.000 0.000 22449 2007-01-05T18:35:54.815 0.021 0.000 0.006 22470 2007-01-07T10:48:54.815 -0.026 0.000 0.008 22486 2007-01-08T19:53:54.815 0.020 -0.000 0.003 22508 2007-01-10T14:45:54.815 -0.027 0.000 -0.006 22533 2007-01-12T16:40:54.815 -0.015 -0.000 -0.004 22547 2007-01-13T19:38:54.815 0.027 -0.001 0.001 22572 2007-01-15T20:10:54.815 -0.020 -0.000 0.003 22590 2007-01-17T07:33:54.815 0.020 0.000 0.001 22607 2007-01-18T18:21:54.815 0.008 -0.000 0.001 22632 2007-01-20T19:13:54.815 0.007 -0.000 -0.003 22654 2007-01-22T14:38:54.815 0.005 -0.000 -0.002 22676 2007-01-24T10:33:54.815 -0.008 0.000 -0.000 22692 2007-01-25T18:33:54.815 0.022 -0.000 0.008 22715 2007-01-27T15:54:54.815 -0.001 0.000 -0.000 22731 2007-01-28T23:19:54.815 -0.014 0.000 -0.001 22749 2007-01-30T09:43:54.815 0.012 0.000 0.002 22765 2007-01-31T18:28:54.815 -0.001 -0.000 0.000 22784 2007-02-02T07:48:54.815 0.013 -0.000 -0.003 22800 2007-02-03T15:44:54.815 -0.024 0.000 -0.004 22814 2007-02-04T19:34:54.815 -0.008 0.000 -0.003 22832 2007-02-06T07:13:54.815 -0.003 0.000 -0.001 22858 2007-02-08T10:02:54.815 0.012 -0.000 -0.004 22872 2007-02-09T14:43:54.815 0.006 0.000 0.002 22888 2007-02-10T21:44:54.814 0.014 -0.000 0.004 22905 2007-02-12T07:13:54.814 0.008 0.000 0.001 22923 2007-02-13T18:53:54.814 -0.003 0.000 -0.001 22943 2007-02-15T10:58:54.814 -0.004 0.000 -0.002 22966 2007-02-17T07:58:54.814 -0.005 -0.000 -0.002 22984 2007-02-18T19:28:54.814 0.004 0.000 0.001 23008 2007-02-20T17:43:54.814 -0.020 -0.000 0.000 23029 2007-02-22T11:23:54.814 0.027 0.000 -0.008 23049 2007-02-24T03:55:54.814 -0.001 -0.000 -0.000 23067 2007-02-25T15:28:54.814 -0.005 -0.000 -0.002 23091 2007-02-27T14:03:54.814 0.005 0.000 -0.002 23113 2007-03-01T10:48:54.814 0.005 0.000 0.003 23133 2007-03-03T01:58:54.814 -0.001 -0.000 -0.001 23154 2007-03-04T18:13:54.814 0.003 0.000 0.000 23170 2007-03-06T03:03:54.814 0.010 0.000 0.004 23186 2007-03-07T10:48:54.814 -0.003 -0.000 -0.002 23202 2007-03-08T18:18:54.814 -0.003 -0.000 -0.001 23223 2007-03-10T11:48:54.814 -0.002 -0.000 -0.001 23246 2007-03-12T09:18:54.814 -0.008 -0.000 -0.005 23262 2007-03-13T16:55:54.814 -0.001 0.000 -0.000 23273 2007-03-14T13:37:54.814 0.003 -0.000 -0.001 23296 2007-03-16T12:06:54.814 -0.010 -0.000 -0.005 23318 2007-03-18T07:43:54.814 0.004 0.000 0.003 23331 2007-03-19T09:18:54.814 0.007 0.000 0.004 23343 2007-03-20T09:03:54.814 0.002 0.000 0.001 23366 2007-03-22T06:26:54.814 -0.010 -0.000 -0.006 23384 2007-03-23T18:00:54.814 -0.006 -0.000 -0.004 23399 2007-03-24T23:39:54.814 0.001 0.000 0.001 23412 2007-03-26T01:20:54.814 -0.005 0.000 -0.003 23433 2007-03-27T18:51:54.814 0.004 0.000 0.003 23456 2007-03-29T16:18:54.814 -0.001 0.000 -0.001 23477 2007-03-31T09:48:54.814 -0.000 0.000 -0.000