2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Jan 31 15:28:20 PST 2012 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 43452 through 44568): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2011 OCT 01 00:01:06.182 2012 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_od43429-43508_rec_v1.bsp spk_m_od43507-43587_rec_v1.bsp spk_m_od43585-43685_rec_v1.bsp spk_m_od43683-43768_rec_v1.bsp spk_m_od43767-43855_rec_v1.bsp spk_m_od43854-43938_rec_v1.bsp spk_m_od43937-44023_rec_v1.bsp spk_m_od44022-44091_rec_v1.bsp spk_m_od44089-44195_rec_v1.bsp spk_m_od44193-44283_rec_v1.bsp spk_m_od44281-44369_rec_v1.bsp spk_m_od44367-44454_rec_v1.bsp spk_m_od44452-44529_rec_v1.bsp spk_m_od44527-44626_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_ext29.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 43460 2011-10-01T18:09:53.817 -0.000 -0.000 -0.000 43473 2011-10-02T19:37:53.817 -0.002 -0.000 0.006 43494 2011-10-04T13:03:53.817 0.001 0.000 -0.004 43507 2011-10-05T16:11:33.817 -0.002 -0.000 -0.003 43531 2011-10-07T14:10:23.817 0.002 -0.000 -0.004 43551 2011-10-09T05:41:23.817 -0.003 0.000 0.006 43568 2011-10-10T17:01:23.817 0.001 -0.000 -0.002 43585 2011-10-12T02:18:53.817 0.003 0.000 0.005 43604 2011-10-13T16:03:53.817 0.001 -0.000 0.000 43619 2011-10-14T20:03:53.817 -0.000 -0.000 0.002 43636 2011-10-16T05:33:53.817 -0.001 -0.000 0.002 43655 2011-10-17T19:03:53.817 0.000 0.000 -0.000 43672 2011-10-19T04:54:53.817 0.002 0.000 -0.005 43683 2011-10-20T03:50:53.817 -0.000 -0.000 -0.000 43701 2011-10-21T13:56:53.817 0.000 0.000 -0.000 43721 2011-10-23T05:26:53.817 0.002 -0.000 -0.005 43739 2011-10-24T17:14:53.817 -0.002 -0.000 0.006 43754 2011-10-26T00:21:23.817 0.003 -0.000 -0.001 43767 2011-10-27T02:01:23.817 -0.005 -0.000 0.002 43788 2011-10-28T17:49:23.817 -0.004 0.000 0.010 43807 2011-10-30T07:18:53.817 0.001 -0.000 -0.003 43824 2011-10-31T18:39:23.817 -0.001 -0.000 0.001 43837 2011-11-01T18:35:53.817 -0.001 0.000 0.001 43854 2011-11-03T05:35:53.817 0.000 -0.000 0.001 43872 2011-11-04T15:56:53.817 -0.000 0.000 0.000 43888 2011-11-05T23:32:53.817 0.000 -0.000 -0.002 43907 2011-11-07T13:03:53.817 0.001 0.000 -0.002 43926 2011-11-09T02:23:53.817 -0.002 -0.000 0.006 43937 2011-11-10T01:40:23.817 -0.002 -0.000 -0.004 43959 2011-11-11T19:32:23.817 0.000 0.000 -0.002 43979 2011-11-13T11:03:53.817 0.001 -0.000 -0.002 43995 2011-11-14T18:43:53.817 -0.002 -0.000 0.007 44011 2011-11-16T02:27:53.817 0.005 0.000 -0.018 44022 2011-11-17T01:38:53.817 -0.003 0.000 -0.003 44042 2011-11-18T17:18:53.817 0.000 0.000 -0.001 44061 2011-11-20T06:48:53.817 -0.000 0.000 0.000 44079 2011-11-21T16:38:53.817 -0.002 -0.000 0.006 44089 2011-11-22T13:49:23.817 -0.001 -0.000 -0.002 44109 2011-11-24T03:51:23.817 -0.001 0.000 0.004 44127 2011-11-25T15:26:48.817 -0.001 -0.000 0.004 44147 2011-11-27T06:57:23.817 0.002 0.000 -0.007 44162 2011-11-28T14:18:53.816 -0.002 -0.000 0.002 44177 2011-11-29T18:22:53.816 0.002 0.000 -0.008 44193 2011-12-01T03:18:53.816 0.000 0.000 -0.000 44214 2011-12-02T19:18:53.816 -0.000 -0.000 -0.000 44235 2011-12-04T12:43:53.816 -0.002 -0.000 0.005 44249 2011-12-05T16:25:58.816 0.001 -0.000 -0.002 44267 2011-12-07T04:08:53.816 0.001 0.000 -0.004 44281 2011-12-08T09:00:53.816 -0.000 0.000 -0.001 44299 2011-12-09T19:13:53.816 0.000 0.000 -0.001 44319 2011-12-11T10:50:53.816 -0.002 0.000 0.007 44334 2011-12-12T16:28:53.816 0.005 0.000 -0.015 44355 2011-12-14T09:48:53.816 0.000 0.000 -0.003 44367 2011-12-15T11:12:53.816 -0.002 0.000 0.000 44383 2011-12-16T17:16:53.816 -0.001 -0.000 0.004 44401 2011-12-18T04:49:53.816 0.000 -0.000 0.000 44419 2011-12-19T16:22:53.816 0.002 0.000 -0.005 44438 2011-12-21T05:46:48.816 -0.003 -0.000 0.008 44452 2011-12-22T10:51:23.816 0.003 0.000 0.006 44473 2011-12-24T02:55:03.816 0.001 -0.000 -0.002 44492 2011-12-25T18:10:08.816 0.001 -0.000 -0.000 44514 2011-12-27T11:54:23.816 0.001 0.000 -0.003 44527 2011-12-28T15:17:53.816 0.002 0.000 -0.001 44542 2011-12-29T19:20:53.816 0.002 0.000 -0.005 44555 2011-12-30T21:01:53.816 0.000 0.000 -0.000