2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Jul 30 07:34:40 PDT 2015 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 58978 through 60082): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2015 APR 01 00:01:07.185 2015 JUL 01 01:01:08.184 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_od58906-58994_rec_v1.bsp spk_m_od58992-59067_rec_v1.bsp spk_m_od59066-59157_rec_v1.bsp spk_m_od59156-59246_rec_v1.bsp spk_m_od59245-59328_rec_v1.bsp spk_m_od59326-59421_rec_v1.bsp spk_m_od59418-59500_rec_v1.bsp spk_m_od59499-59580_rec_v1.bsp spk_m_od59577-59666_rec_v1.bsp spk_m_od59666-59753_rec_v1.bsp spk_m_od59750-60032_rec_v1.bsp spk_m_od59802-60011_rec_v1.bsp spk_m_od60010-60097_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_ext43.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 58981 2015-04-01T07:27:32.814 -0.007 0.000 0.002 58991 2015-04-02T03:41:52.814 0.015 -0.000 -0.006 59016 2015-04-04T05:16:27.814 0.005 0.000 -0.001 59035 2015-04-05T18:51:52.814 -0.036 -0.000 0.005 59047 2015-04-06T18:53:52.814 -0.004 0.000 -0.001 59065 2015-04-08T05:12:42.814 0.044 0.000 0.002 59079 2015-04-09T10:13:14.814 -0.037 -0.000 -0.013 59095 2015-04-10T17:12:44.814 -0.004 -0.000 0.001 59108 2015-04-11T18:55:52.814 0.032 -0.000 -0.010 59124 2015-04-13T03:13:52.814 0.083 0.001 0.031 59145 2015-04-14T18:53:52.814 -0.047 -0.001 -0.018 59155 2015-04-15T15:16:52.814 -0.025 0.001 0.005 59174 2015-04-17T05:22:52.814 -0.054 0.000 0.014 59192 2015-04-18T17:04:52.814 -0.003 0.000 0.000 59209 2015-04-20T02:12:52.814 0.028 -0.000 -0.010 59229 2015-04-21T17:56:48.814 -0.013 0.000 0.004 59244 2015-04-22T22:58:52.814 0.003 -0.000 0.000 59260 2015-04-24T06:34:39.814 0.018 0.000 0.000 59274 2015-04-25T11:31:39.814 0.036 0.001 0.009 59294 2015-04-27T02:53:15.814 -0.056 -0.000 -0.007 59307 2015-04-28T03:08:52.814 -0.051 -0.000 -0.014 59325 2015-04-29T15:18:52.814 0.107 -0.001 -0.026 59342 2015-05-01T01:32:52.814 -0.019 0.000 0.001 59362 2015-05-02T17:03:52.814 0.054 0.000 -0.003 59379 2015-05-04T02:08:52.814 -0.094 0.001 0.026 59405 2015-05-06T04:41:11.814 0.039 0.000 0.011 59417 2015-05-07T05:18:52.814 0.033 -0.001 -0.009 59433 2015-05-08T13:23:52.814 0.048 -0.000 -0.001 59460 2015-05-10T17:47:52.814 0.116 0.000 -0.000 59474 2015-05-11T21:13:52.814 -0.044 -0.000 -0.007 59485 2015-05-12T20:33:20.814 -0.032 -0.000 -0.007 59498 2015-05-13T21:08:22.814 -0.015 0.002 0.003 59517 2015-05-15T10:53:37.814 -0.032 0.001 0.008 59531 2015-05-16T14:50:39.814 -0.008 0.000 0.002 59549 2015-05-18T02:03:24.814 0.061 -0.000 -0.013 59561 2015-05-19T02:51:52.814 -0.033 -0.000 -0.007 59576 2015-05-20T08:33:52.814 -0.089 -0.000 -0.018 59592 2015-05-21T15:58:52.814 -0.156 -0.001 -0.029 59611 2015-05-23T04:08:52.814 0.177 0.001 0.002 59624 2015-05-24T05:52:52.814 0.063 0.001 -0.001 59636 2015-05-25T05:46:12.814 -0.089 -0.000 0.010 59648 2015-05-26T05:45:27.814 -0.045 0.001 0.008 59665 2015-05-27T14:49:42.814 0.094 0.001 0.002 59684 2015-05-29T04:21:15.815 -0.037 0.000 -0.001 59702 2015-05-30T17:24:18.815 0.037 0.000 0.006 59719 2015-06-01T01:34:52.815 -0.025 -0.001 0.000 59732 2015-06-02T04:25:52.815 -0.016 -0.002 -0.002 59749 2015-06-03T14:28:52.815 0.039 -0.001 0.005 59764 2015-06-04T18:18:52.815 -0.024 -0.000 -0.001 59781 2015-06-06T05:36:52.815 0.101 0.001 0.014 59794 2015-06-07T05:31:52.815 -0.020 0.001 -0.002 59801 2015-06-07T20:45:31.815 -0.011 0.002 -0.001 59970 2015-06-21T17:49:05.815 -0.010 0.000 0.001 59982 2015-06-22T18:15:52.815 -0.080 0.001 -0.005 59994 2015-06-23T18:08:52.815 0.143 -0.000 0.013 60009 2015-06-24T22:43:39.815 -0.045 -0.000 0.004 60030 2015-06-26T17:39:40.815 -0.007 -0.001 -0.000 60048 2015-06-28T04:05:48.815 0.030 0.000 -0.003 60060 2015-06-29T05:06:01.815 0.019 0.000 -0.000 60077 2015-06-30T14:18:52.815 -0.018 0.000 -0.001