2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Jul 19 10:46:18 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 23485 through 24590): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 APR 01 00:01:05.185 2007 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_od23456-23538_rec_v1.bsp spk_m_od23537-23625_rec_v1.bsp spk_m_od23624-23713_rec_v1.bsp spk_m_od23712-23784_rec_v1.bsp spk_m_od23783-23879_rec_v1.bsp spk_m_od23878-23967_rec_v1.bsp spk_m_od23965-24035_rec_v1.bsp spk_m_od24033-24119_rec_v1.bsp spk_m_od24118-24208_rec_v1.bsp spk_m_od24207-24295_rec_v1.bsp spk_m_od24294-24378_rec_v1.bsp spk_m_od24377-24463_rec_v1.bsp spk_m_od24462-24560_rec_v1.bsp spk_m_od24559-24626_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_ext11.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 23492 2007-04-01T15:28:54.814 0.004 0.000 0.003 23514 2007-04-03T10:58:54.814 -0.008 -0.000 -0.006 23537 2007-04-05T08:23:54.814 0.004 0.000 0.003 23561 2007-04-07T07:48:54.814 0.003 0.000 0.002 23585 2007-04-09T07:13:54.814 0.002 0.000 0.001 23603 2007-04-10T18:47:54.814 0.005 0.000 0.004 23624 2007-04-12T12:17:54.814 -0.003 -0.000 -0.002 23644 2007-04-14T03:48:54.814 -0.005 -0.000 -0.004 23660 2007-04-15T11:42:54.814 -0.004 0.000 -0.004 23674 2007-04-16T15:08:54.814 0.002 0.000 0.002 23694 2007-04-18T05:08:54.814 0.004 -0.000 0.002 23712 2007-04-19T18:13:54.814 -0.008 -0.000 -0.007 23735 2007-04-21T15:39:54.814 0.001 -0.000 0.001 23759 2007-04-23T15:03:54.814 -0.005 0.000 -0.005 23783 2007-04-25T14:30:54.814 0.007 0.000 0.007 23797 2007-04-26T18:08:54.814 0.001 0.000 0.001 23820 2007-04-28T15:36:54.814 -0.000 0.000 -0.000 23833 2007-04-29T17:18:54.814 0.007 0.000 0.007 23856 2007-05-01T14:45:54.814 -0.006 -0.000 -0.006 23878 2007-05-03T10:14:54.814 -0.001 -0.000 -0.001 23893 2007-05-04T15:52:54.814 0.003 -0.000 0.004 23907 2007-05-05T19:32:54.814 0.004 0.000 0.004 23925 2007-05-07T07:05:54.814 -0.004 -0.000 -0.004 23946 2007-05-09T00:46:54.814 0.001 -0.000 0.002 23965 2007-05-10T14:08:54.814 -0.003 -0.000 -0.003 23986 2007-05-12T07:43:54.814 -0.004 -0.000 -0.006 23998 2007-05-13T07:21:54.814 0.000 0.000 0.000 24015 2007-05-14T16:56:54.814 0.002 0.000 0.002 24033 2007-05-16T04:28:54.814 -0.000 0.000 -0.000 24047 2007-05-17T08:10:54.814 0.003 0.000 0.003 24070 2007-05-19T05:38:54.814 -0.003 -0.000 -0.004 24094 2007-05-21T05:03:54.814 0.003 0.000 0.003 24118 2007-05-23T04:28:54.814 0.002 0.000 0.003 24137 2007-05-24T18:00:54.814 0.001 0.000 0.001 24155 2007-05-26T05:53:54.814 0.001 -0.000 0.001 24168 2007-05-27T07:16:54.814 -0.002 -0.000 -0.003 24186 2007-05-28T18:48:54.815 0.002 0.000 0.002 24207 2007-05-30T12:03:54.815 -0.001 0.000 -0.000 24230 2007-06-01T09:48:54.815 0.001 -0.000 0.001 24252 2007-06-03T05:15:54.815 -0.001 -0.000 -0.001 24276 2007-06-05T04:38:54.815 0.001 0.000 0.001 24294 2007-06-06T16:13:54.815 -0.000 -0.000 -0.000 24316 2007-06-08T11:42:54.815 0.001 -0.000 0.001 24338 2007-06-10T07:18:54.815 0.002 0.000 0.003 24356 2007-06-11T18:48:54.815 -0.001 0.000 -0.001 24377 2007-06-13T12:13:54.815 -0.000 0.000 -0.000 24400 2007-06-15T09:43:54.815 0.001 0.000 0.001 24423 2007-06-17T07:08:54.815 0.001 -0.000 0.002 24440 2007-06-18T16:43:54.815 -0.002 -0.000 -0.003 24462 2007-06-20T12:08:54.815 0.001 -0.000 0.002 24483 2007-06-22T05:40:54.815 0.001 0.000 0.002 24501 2007-06-23T17:18:54.815 0.000 0.000 0.000 24526 2007-06-25T18:39:54.815 -0.002 -0.000 -0.003 24543 2007-06-27T04:14:54.815 -0.002 0.000 -0.003 24559 2007-06-28T11:51:54.815 -0.001 0.000 -0.001 24581 2007-06-30T07:19:54.815 -0.000 -0.000 -0.001