2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Feb 4 09:13:31 PST 2014 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 52333 through 53450): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2013 OCT 01 00:01:07.182 2014 JAN 01 01:01:07.183 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_od52266-52352_rec_v1.bsp spk_m_od52351-52440_rec_v1.bsp spk_m_od52439-52527_rec_v1.bsp spk_m_od52525-52603_rec_v1.bsp spk_m_od52602-52692_rec_v1.bsp spk_m_od52691-52774_rec_v1.bsp spk_m_od52772-52871_rec_v1.bsp spk_m_od52869-52951_rec_v1.bsp spk_m_od52949-53016_rec_v1.bsp spk_m_od53015-53126_rec_v1.bsp spk_m_od53124-53175_rec_v1.bsp spk_m_od53173-53284_rec_v1.bsp spk_m_od53283-53351_rec_v1.bsp spk_m_od53350-53461_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_ext37.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 52350 2013-10-02T11:14:52.817 0.002 -0.000 -0.001 52376 2013-10-04T14:54:52.817 0.004 -0.000 -0.005 52391 2013-10-05T20:31:52.817 -0.003 0.000 0.004 52408 2013-10-07T07:38:52.817 -0.000 -0.000 0.000 52424 2013-10-08T13:41:52.817 0.000 -0.001 -0.001 52438 2013-10-09T18:50:52.817 0.000 -0.000 -0.000 52460 2013-10-11T12:46:52.817 -0.002 -0.000 0.003 52478 2013-10-13T00:49:52.817 0.002 -0.000 -0.000 52495 2013-10-14T09:54:52.817 0.003 -0.000 -0.005 52509 2013-10-15T13:32:52.817 -0.002 0.000 0.003 52524 2013-10-16T20:03:52.817 0.000 0.000 0.000 52542 2013-10-18T06:41:52.817 0.004 0.000 -0.005 52559 2013-10-19T16:15:52.817 -0.001 0.000 0.002 52574 2013-10-20T23:26:52.817 -0.000 -0.000 0.000 52586 2013-10-21T21:35:52.817 -0.000 -0.000 0.000 52601 2013-10-23T04:06:52.817 0.003 0.000 0.004 52614 2013-10-24T04:43:52.817 0.002 0.000 -0.002 52630 2013-10-25T13:29:52.817 0.001 0.000 0.002 52645 2013-10-26T19:28:52.817 -0.005 -0.000 -0.003 52658 2013-10-27T19:48:52.817 0.002 0.000 -0.003 52676 2013-10-29T07:18:52.817 0.000 0.000 0.000 52690 2013-10-30T11:53:52.817 0.000 -0.000 0.001 52707 2013-10-31T20:25:52.817 0.001 -0.000 -0.001 52724 2013-11-02T06:09:52.817 0.004 0.000 -0.005 52740 2013-11-03T13:59:52.817 -0.003 0.000 0.003 52755 2013-11-04T19:22:52.817 -0.005 0.000 0.007 52771 2013-11-06T03:51:52.817 0.005 0.000 0.006 52788 2013-11-07T13:53:52.817 -0.002 0.000 -0.001 52801 2013-11-08T14:12:52.817 -0.001 0.000 0.001 52813 2013-11-09T13:54:52.817 -0.002 0.000 0.002 52825 2013-11-10T13:36:52.817 0.001 0.000 -0.002 52837 2013-11-11T13:18:52.817 -0.001 0.000 0.002 52852 2013-11-12T20:29:52.817 0.001 0.000 -0.000 52868 2013-11-14T03:53:02.817 0.001 0.000 0.001 52886 2013-11-15T14:03:57.817 -0.001 -0.000 0.002 52901 2013-11-16T19:41:47.817 0.001 -0.000 -0.002 52918 2013-11-18T05:15:47.817 -0.000 -0.000 0.000 52930 2013-11-19T06:11:52.817 0.001 -0.000 0.001 52948 2013-11-20T17:24:52.817 0.000 -0.000 0.000 52967 2013-11-22T07:29:52.817 0.002 -0.000 0.001 52983 2013-11-23T13:36:52.817 -0.002 -0.000 0.002 52995 2013-11-24T15:00:52.817 0.002 0.000 -0.002 53014 2013-11-26T03:44:52.817 -0.002 0.000 -0.004 53033 2013-11-27T16:21:52.816 0.000 -0.000 -0.000 53052 2013-11-29T05:43:52.816 -0.000 -0.000 0.001 53067 2013-11-30T12:44:52.816 -0.001 0.000 -0.001 53077 2013-12-01T07:15:52.816 0.001 0.000 -0.001 53092 2013-12-02T12:53:52.816 -0.002 -0.000 0.004 53107 2013-12-03T18:30:52.816 0.000 -0.000 -0.001 53123 2013-12-05T03:14:52.816 0.002 0.000 0.002 53137 2013-12-06T05:45:52.816 -0.000 0.000 0.000 53150 2013-12-07T08:41:52.816 0.002 0.000 0.003 53163 2013-12-08T09:00:52.816 0.005 -0.000 -0.006 53172 2013-12-09T03:49:47.816 0.039 -0.000 0.054 53194 2013-12-10T22:20:07.816 0.012 0.000 -0.017 53210 2013-12-12T05:58:52.816 0.003 -0.000 -0.004 53230 2013-12-13T21:27:47.816 -0.001 -0.000 0.002 53250 2013-12-15T12:57:47.816 -0.005 -0.000 0.007 53270 2013-12-17T04:27:07.816 -0.002 -0.000 0.003 53282 2013-12-18T05:14:52.816 -0.000 -0.000 -0.000 53295 2013-12-19T07:06:52.816 0.001 0.000 0.001 53313 2013-12-20T18:37:52.816 -0.001 -0.000 -0.001 53332 2013-12-22T06:53:52.816 -0.003 0.000 0.004 53349 2013-12-23T17:23:42.816 -0.002 0.000 -0.002 53371 2013-12-25T11:54:22.816 -0.000 -0.000 0.001 53385 2013-12-26T15:18:57.816 0.001 -0.000 -0.001 53404 2013-12-28T05:05:47.816 -0.003 0.000 0.005 53419 2013-12-29T10:43:52.816 0.002 -0.000 -0.003 53433 2013-12-30T14:16:52.816 -0.002 0.000 0.002 53446 2013-12-31T16:00:52.816 -0.001 -0.000 0.001