2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Nov 7 13:58:28 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 55650 through 56767): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2014 JUL 01 00:01:07.184 2014 OCT 01 01:01:07.182 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_od55583-55677_rec_v1.bsp spk_m_od55676-55766_rec_v1.bsp spk_m_od55764-55847_rec_v1.bsp spk_m_od55846-55927_rec_v1.bsp spk_m_od55926-56013_rec_v1.bsp spk_m_od56012-56105_rec_v1.bsp spk_m_od56104-56186_rec_v1.bsp spk_m_od56185-56275_rec_v1.bsp spk_m_od56274-56344_rec_v1.bsp spk_m_od56343-56436_rec_v1.bsp spk_m_od56433-56517_rec_v1.bsp spk_m_od56516-56608_rec_v1.bsp spk_m_od56607-56692_rec_v1.bsp spk_m_od56691-56769_rec_v1.bsp spk_m_od56767-56866_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_ext40.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 55660 2014-07-01T22:16:52.815 -0.006 0.000 0.006 55675 2014-07-03T03:30:52.815 0.003 0.000 -0.001 55696 2014-07-04T21:33:52.815 -0.004 -0.000 0.003 55716 2014-07-06T12:53:52.816 -0.001 -0.000 0.001 55730 2014-07-07T16:32:58.816 0.005 -0.000 -0.005 55745 2014-07-08T22:09:14.816 -0.007 -0.000 0.007 55763 2014-07-10T09:05:52.816 0.007 -0.000 0.003 55781 2014-07-11T20:28:52.816 -0.005 0.000 -0.004 55795 2014-07-13T00:56:52.816 0.010 0.000 -0.010 55807 2014-07-14T00:37:57.816 -0.003 -0.000 0.003 55818 2014-07-14T21:34:42.816 -0.007 0.000 -0.005 55830 2014-07-15T22:03:32.816 -0.001 0.000 0.000 55845 2014-07-17T02:33:52.816 0.012 -0.000 0.011 55867 2014-07-18T22:18:52.816 0.008 -0.000 0.006 55879 2014-07-19T22:15:52.816 0.001 -0.000 0.000 55898 2014-07-21T12:20:32.816 -0.007 -0.000 0.007 55908 2014-07-22T08:07:24.816 -0.004 -0.000 0.004 55925 2014-07-23T16:32:52.816 -0.006 0.000 -0.005 55946 2014-07-25T11:07:57.816 0.000 -0.000 -0.001 55964 2014-07-26T22:42:57.816 0.004 0.000 -0.004 55978 2014-07-28T02:23:22.816 0.004 0.000 -0.004 55998 2014-07-29T17:53:52.816 -0.001 -0.000 0.001 56011 2014-07-30T18:24:57.816 0.005 -0.000 0.005 56024 2014-07-31T21:13:25.816 -0.000 0.000 0.000 56044 2014-08-02T12:42:52.816 0.005 0.000 -0.005 56064 2014-08-04T04:13:52.816 -0.001 -0.000 0.001 56084 2014-08-05T19:45:52.816 0.713 -0.084 -0.004 56103 2014-08-07T08:41:52.816 -0.007 0.000 -0.002 56123 2014-08-09T00:48:52.816 0.000 0.000 -0.000 56135 2014-08-10T00:28:52.816 -0.001 -0.000 0.001 56150 2014-08-11T06:08:07.816 -0.000 -0.000 0.000 56168 2014-08-12T17:43:12.817 0.006 -0.000 -0.005 56184 2014-08-14T00:23:52.817 -0.004 0.000 -0.004 56204 2014-08-15T16:50:52.817 -0.001 -0.000 0.001 56217 2014-08-16T18:32:52.817 -0.004 -0.000 0.004 56234 2014-08-18T04:06:07.817 0.003 -0.000 -0.003 56255 2014-08-19T20:53:58.817 0.002 0.000 0.001 56273 2014-08-21T08:00:35.817 -0.007 0.000 -0.006 56295 2014-08-23T03:46:52.817 -0.005 0.000 -0.004 56314 2014-08-24T18:11:27.817 0.003 0.000 -0.003 56327 2014-08-25T19:15:52.817 0.000 -0.000 0.000 56342 2014-08-27T01:12:52.817 0.002 -0.000 -0.001 56360 2014-08-28T12:20:52.817 0.001 -0.000 0.000 56376 2014-08-29T20:26:52.817 0.006 -0.000 -0.004 56396 2014-08-31T12:11:24.817 -0.000 -0.000 0.000 56415 2014-09-02T01:44:57.817 -0.007 -0.000 0.006 56432 2014-09-03T10:09:32.817 0.008 0.000 0.006 56452 2014-09-05T02:49:52.817 -0.001 0.000 0.001 56472 2014-09-06T18:22:14.817 0.010 -0.000 -0.009 56497 2014-09-08T19:43:52.817 -0.005 0.000 0.004 56515 2014-09-10T06:10:52.817 -0.001 -0.000 -0.001 56534 2014-09-11T19:56:52.817 -0.005 0.000 -0.004 56550 2014-09-13T03:46:52.817 0.006 -0.000 0.003 56570 2014-09-14T19:46:52.817 0.002 -0.000 -0.001 56590 2014-09-16T11:31:00.817 0.001 0.000 -0.001 56606 2014-09-17T17:58:52.817 0.001 0.000 0.001 56629 2014-09-19T16:26:52.817 -0.002 -0.000 0.001 56645 2014-09-20T23:34:52.817 0.003 -0.000 0.001 56667 2014-09-22T19:34:52.817 0.003 0.000 -0.002 56690 2014-09-24T15:55:48.817 0.001 0.000 0.001 56716 2014-09-26T19:29:52.817 -0.000 0.000 -0.000 56739 2014-09-28T17:56:18.817 0.003 -0.000 -0.002 56752 2014-09-29T19:24:52.817 0.005 0.000 -0.004 56766 2014-09-30T22:04:52.817 -0.007 0.000 -0.005