2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Nov 10 15:35:05 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 42334 through 43451): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2011 JUL 01 00:01:06.184 2011 OCT 01 01:01:06.182 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_od42324-42409_rec_v1.bsp spk_m_od42408-42484_rec_v1.bsp spk_m_od42482-42576_rec_v1.bsp spk_m_od42574-42665_rec_v1.bsp spk_m_od42663-42749_rec_v1.bsp spk_m_od42748-42832_rec_v1.bsp spk_m_od42830-42914_rec_v1.bsp spk_m_od42910-43008_rec_v1.bsp spk_m_od43007-43094_rec_v1.bsp spk_m_od43093-43179_rec_v1.bsp spk_m_od43177-43246_rec_v1.bsp spk_m_od43245-43339_rec_v1.bsp spk_m_od43338-43430_rec_v1.bsp spk_m_od43429-43508_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_ext28.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 42340 2011-07-01T13:37:53.815 0.002 0.000 -0.005 42353 2011-07-02T15:18:53.815 -0.000 -0.000 0.000 42369 2011-07-03T22:55:53.815 -0.000 0.000 0.001 42390 2011-07-05T15:51:23.816 0.001 -0.000 -0.001 42408 2011-07-07T04:58:53.816 0.000 0.000 -0.000 42430 2011-07-08T22:53:53.816 -0.002 -0.000 0.001 42452 2011-07-10T18:33:53.816 0.003 -0.000 -0.005 42472 2011-07-12T10:03:53.816 -0.001 0.000 0.002 42482 2011-07-13T07:10:53.816 0.001 0.000 0.001 42498 2011-07-14T13:35:53.816 -0.001 0.000 0.001 42514 2011-07-15T21:10:53.816 0.001 -0.000 -0.002 42529 2011-07-17T02:53:53.816 0.000 0.000 -0.001 42541 2011-07-18T02:43:53.816 -0.001 -0.000 0.002 42560 2011-07-19T15:58:53.816 0.003 0.000 -0.005 42574 2011-07-20T20:56:53.816 0.000 -0.000 0.000 42592 2011-07-22T07:14:53.816 0.003 0.000 -0.006 42609 2011-07-23T17:04:53.816 -0.004 0.000 0.008 42628 2011-07-25T06:36:53.816 0.000 -0.000 -0.001 42646 2011-07-26T17:59:53.816 -0.000 -0.000 0.001 42663 2011-07-28T04:48:53.816 0.001 0.000 0.002 42685 2011-07-29T22:53:53.816 -0.002 0.000 0.004 42702 2011-07-31T08:18:53.816 0.001 0.000 -0.001 42720 2011-08-01T20:03:53.816 0.003 -0.000 -0.007 42734 2011-08-02T23:50:53.816 -0.003 -0.000 0.006 42748 2011-08-04T04:41:53.816 0.001 -0.000 0.002 42769 2011-08-05T21:09:53.816 -0.000 0.000 0.001 42782 2011-08-06T22:41:53.816 -0.001 0.000 0.001 42797 2011-08-08T04:28:53.816 -0.000 -0.000 0.001 42815 2011-08-09T15:43:53.816 -0.001 -0.000 0.001 42830 2011-08-10T22:43:53.816 -0.000 0.000 -0.000 42847 2011-08-12T06:56:23.816 0.001 -0.000 -0.001 42868 2011-08-14T00:26:23.817 -0.000 0.000 0.000 42888 2011-08-15T15:58:53.817 -0.000 0.000 0.000 42902 2011-08-16T19:45:53.817 0.001 0.000 -0.002 42910 2011-08-17T12:44:53.817 -0.001 0.000 -0.003 42927 2011-08-18T21:17:53.817 0.002 0.000 -0.004 42948 2011-08-20T14:28:53.817 -0.001 -0.000 0.002 42964 2011-08-21T22:08:53.817 0.002 0.000 -0.005 42978 2011-08-23T01:48:53.817 -0.002 0.000 0.004 42996 2011-08-24T13:17:53.817 0.001 -0.000 -0.001 43007 2011-08-25T12:22:53.817 0.001 0.000 0.003 43021 2011-08-26T14:48:53.817 -0.005 0.000 0.013 43029 2011-08-27T06:27:53.817 0.005 0.000 -0.007 43047 2011-08-28T18:20:53.817 0.002 -0.000 -0.004 43061 2011-08-29T21:43:53.817 -0.001 0.000 0.002 43081 2011-08-31T13:03:53.817 -0.001 -0.000 0.001 43093 2011-09-01T14:15:53.817 -0.001 0.000 -0.002 43110 2011-09-02T22:46:53.817 -0.001 -0.000 0.002 43129 2011-09-04T11:57:53.817 -0.001 0.000 0.001 43145 2011-09-05T19:46:53.817 0.003 0.000 -0.009 43162 2011-09-07T05:13:53.817 -0.002 -0.000 0.005 43177 2011-09-08T12:10:53.817 -0.003 0.000 -0.007 43199 2011-09-10T06:28:53.817 -0.004 0.000 0.011 43215 2011-09-11T14:12:53.817 0.002 -0.000 -0.004 43231 2011-09-12T21:33:53.817 -0.003 0.000 0.007 43245 2011-09-14T02:53:53.817 0.003 -0.000 -0.000 43264 2011-09-15T16:28:53.817 -0.000 -0.000 0.001 43276 2011-09-16T14:42:53.817 0.003 -0.000 -0.009 43292 2011-09-17T22:13:53.817 -0.001 0.000 0.004 43308 2011-09-19T05:43:53.817 -0.001 -0.000 0.001 43324 2011-09-20T13:18:53.817 0.001 -0.000 -0.002 43338 2011-09-21T18:21:23.817 -0.000 -0.000 0.000 43357 2011-09-23T06:14:23.817 -0.000 0.000 -0.000 43380 2011-09-25T03:53:53.817 -0.001 0.000 0.002 43397 2011-09-26T13:16:23.817 0.002 0.000 -0.003 43417 2011-09-28T05:00:53.817 -0.002 0.000 0.005 43429 2011-09-29T06:04:53.817 0.000 0.000 0.001 43448 2011-09-30T18:26:53.817 -0.000 0.000 0.000