2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Aug 24 08:29:10 PDT 2009 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 32363 through 33467): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2009 APR 01 00:01:06.185 2009 JUL 01 01:01:06.184 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_od32371-32458_rec_v1.bsp spk_m_od32456-32538_rec_v1.bsp spk_m_od32538-32625_rec_v1.bsp spk_m_od32624-32710_rec_v1.bsp spk_m_od32708-32807_rec_v1.bsp spk_m_od32806-32891_rec_v1.bsp spk_m_od32890-32970_rec_v1.bsp spk_m_od32969-33047_rec_v1.bsp spk_m_od33046-33145_rec_v1.bsp spk_m_od33144-33213_rec_v1.bsp spk_m_od33213-33314_rec_v1.bsp spk_m_od33312-33390_rec_v1.bsp spk_m_od33388-33474_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_ext19.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 32371 2009-04-01T18:33:53.814 0.008 0.000 0.009 32393 2009-04-03T14:13:53.814 -0.002 0.000 -0.002 32418 2009-04-05T15:32:53.814 0.002 -0.000 0.003 32435 2009-04-07T01:08:53.814 -0.004 0.000 -0.005 32456 2009-04-08T18:38:53.814 -0.001 -0.000 -0.002 32481 2009-04-10T20:12:53.814 -0.006 -0.000 -0.007 32493 2009-04-11T19:46:53.814 0.002 -0.000 0.003 32515 2009-04-13T15:18:53.814 -0.001 0.000 -0.001 32538 2009-04-15T11:03:53.814 -0.000 0.000 -0.001 32559 2009-04-17T06:13:53.814 -0.002 -0.000 -0.003 32579 2009-04-18T20:08:53.814 0.001 0.000 0.001 32599 2009-04-20T13:18:53.814 0.001 -0.000 0.002 32624 2009-04-22T13:01:53.814 -0.001 -0.000 -0.001 32636 2009-04-23T14:22:53.814 -0.003 -0.000 -0.005 32651 2009-04-24T20:03:53.814 0.002 -0.000 0.003 32671 2009-04-26T11:33:53.814 0.000 0.000 0.001 32687 2009-04-27T19:18:53.814 -0.002 -0.000 -0.003 32708 2009-04-29T12:48:53.814 0.001 0.000 0.002 32729 2009-05-01T06:13:53.814 -0.002 -0.000 -0.003 32749 2009-05-02T21:43:53.814 0.003 -0.000 0.005 32766 2009-05-04T07:16:53.814 0.003 0.000 0.006 32784 2009-05-05T18:51:53.814 -0.002 0.000 -0.003 32806 2009-05-07T14:19:53.814 0.000 -0.000 0.001 32828 2009-05-09T09:48:53.814 0.002 0.000 0.003 32847 2009-05-10T21:43:53.814 0.002 -0.000 0.002 32867 2009-05-12T13:18:53.814 -0.002 -0.000 -0.001 32890 2009-05-14T10:41:28.814 -0.001 0.000 -0.002 32909 2009-05-16T02:08:53.814 -0.001 -0.000 0.000 32927 2009-05-17T13:41:53.814 -0.001 0.000 -0.001 32947 2009-05-19T05:14:53.814 -0.000 0.000 0.001 32969 2009-05-20T22:48:53.814 -0.002 -0.000 -0.002 32988 2009-05-22T14:13:53.814 -0.001 -0.000 -0.003 33006 2009-05-23T23:58:53.814 -0.001 -0.000 -0.001 33027 2009-05-25T19:22:53.814 0.001 -0.000 0.002 33046 2009-05-27T07:03:53.814 0.004 0.000 0.002 33064 2009-05-28T20:26:23.815 -0.001 -0.000 -0.001 33086 2009-05-30T15:54:53.815 0.003 -0.000 0.006 33098 2009-05-31T15:37:53.815 -0.002 0.000 -0.003 33113 2009-06-01T21:15:53.815 -0.001 -0.000 -0.001 33133 2009-06-03T12:46:53.815 0.002 0.000 0.003 33144 2009-06-04T08:41:23.815 -0.002 0.000 -0.001 33168 2009-06-06T08:06:23.815 -0.000 0.000 -0.001 33185 2009-06-07T19:32:53.815 -0.000 0.000 -0.002 33195 2009-06-08T15:19:53.815 0.002 -0.000 0.005 33206 2009-06-09T13:06:53.815 0.054 -0.002 0.092 33213 2009-06-10T01:00:53.815 0.047 -0.001 0.055 33224 2009-06-11T00:42:53.815 -0.006 0.001 -0.012 33244 2009-06-12T16:00:53.815 -0.005 0.000 -0.023 33271 2009-06-14T19:40:53.815 0.001 0.000 0.001 33294 2009-06-16T17:06:53.815 0.002 -0.000 0.004 33312 2009-06-18T06:23:53.815 -0.002 -0.000 -0.005 33334 2009-06-20T01:48:53.815 0.001 -0.000 0.004 33352 2009-06-21T13:23:53.815 -0.002 0.000 -0.007 33367 2009-06-22T19:03:53.815 0.002 0.000 0.007 33388 2009-06-24T12:33:53.815 -0.002 -0.000 -0.006 33404 2009-06-25T20:07:53.815 -0.002 -0.000 -0.006 33416 2009-06-26T19:50:53.815 0.001 0.000 0.005 33432 2009-06-28T03:28:53.815 -0.001 -0.000 -0.005 33452 2009-06-29T19:03:53.815 -0.000 -0.000 -0.001