2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Jul 26 10:07:22 PDT 2013 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 50109 through 51214): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2013 APR 01 00:01:07.185 2013 JUL 01 01:01:07.184 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_od50045-50134_rec_v1.bsp spk_m_od50133-50217_rec_v1.bsp spk_m_od50215-50449_rec_v1.bsp spk_m_od50383-50482_rec_v1.bsp spk_m_od50481-50558_rec_v1.bsp spk_m_od50557-50649_rec_v1.bsp spk_m_od50647-50730_rec_v1.bsp spk_m_od50728-50805_rec_v1.bsp spk_m_od50805-50911_rec_v1.bsp spk_m_od50909-50992_rec_v1.bsp spk_m_od50990-51070_rec_v1.bsp spk_m_od51069-51154_rec_v1.bsp spk_m_od51152-51237_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_ext35.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 50117 2013-04-01T18:27:52.814 -0.009 0.000 0.002 50132 2013-04-03T00:45:52.814 -0.006 -0.001 -0.003 50153 2013-04-04T17:32:52.814 0.012 -0.000 -0.003 50167 2013-04-05T22:03:52.814 -0.018 0.001 -0.013 50181 2013-04-07T00:48:52.814 -0.006 0.001 0.001 50194 2013-04-08T01:53:52.814 0.014 0.001 -0.011 50214 2013-04-09T18:42:52.814 -0.011 0.004 -0.016 50382 2013-04-23T14:28:52.814 -0.227 0.013 -0.034 50393 2013-04-24T11:30:52.814 -0.032 -0.000 0.008 50408 2013-04-25T17:06:52.814 0.013 -0.000 -0.005 50421 2013-04-26T18:12:52.814 0.003 -0.001 -0.002 50433 2013-04-27T18:28:52.814 0.012 0.001 -0.004 50446 2013-04-28T19:38:52.814 -0.030 0.000 0.026 50462 2013-04-30T03:13:52.814 0.026 0.000 -0.023 50480 2013-05-01T14:24:52.814 -0.004 -0.000 0.000 50495 2013-05-02T20:54:52.814 0.002 0.000 -0.001 50517 2013-05-04T16:05:52.814 0.006 0.000 -0.005 50529 2013-05-05T15:15:52.814 -0.008 0.000 0.001 50542 2013-05-06T17:09:52.814 -0.002 -0.000 0.001 50556 2013-05-07T20:33:52.814 -0.002 -0.000 0.000 50574 2013-05-09T08:01:52.814 -0.001 0.000 -0.000 50592 2013-05-10T20:28:52.814 0.006 0.000 -0.002 50606 2013-05-11T23:13:52.814 -0.010 0.000 -0.001 50618 2013-05-12T23:15:52.814 0.010 -0.000 -0.008 50629 2013-05-13T21:30:52.814 -0.004 -0.000 0.002 50646 2013-05-15T07:31:52.814 0.000 0.001 -0.000 50669 2013-05-17T05:19:52.814 0.005 0.000 0.004 50687 2013-05-18T15:10:52.814 -0.004 -0.000 -0.000 50701 2013-05-19T19:43:52.814 0.001 -0.000 0.000 50715 2013-05-20T23:54:52.814 0.004 -0.000 0.004 50727 2013-05-21T23:38:52.814 -0.002 0.000 -0.002 50748 2013-05-23T16:11:52.814 0.004 0.000 -0.003 50761 2013-05-24T17:44:52.814 -0.004 -0.000 0.004 50776 2013-05-25T23:49:52.814 0.001 -0.000 -0.000 50793 2013-05-27T09:23:52.814 -0.001 -0.000 0.001 50804 2013-05-28T06:17:52.815 0.000 -0.000 0.000 50822 2013-05-29T17:53:52.815 0.004 0.000 -0.001 50834 2013-05-30T17:26:52.815 0.002 -0.000 0.000 50845 2013-05-31T15:08:52.815 0.001 0.000 0.000 50858 2013-06-01T16:50:52.815 0.002 0.000 0.000 50873 2013-06-02T23:01:52.815 0.004 -0.000 -0.004 50882 2013-06-03T16:14:52.815 -0.007 -0.000 -0.001 50898 2013-06-04T23:49:52.815 -0.001 -0.000 -0.000 50908 2013-06-05T20:53:52.815 0.004 0.000 0.003 50927 2013-06-07T10:29:52.815 0.001 0.000 0.001 50945 2013-06-08T21:11:52.815 0.006 -0.000 -0.005 50959 2013-06-10T00:38:52.815 -0.004 -0.000 0.004 50976 2013-06-11T11:28:52.815 0.002 0.000 0.002 50989 2013-06-12T13:12:52.815 -0.006 -0.000 -0.004 51004 2013-06-13T17:37:52.815 0.001 0.000 -0.001 51021 2013-06-15T04:27:52.815 -0.002 0.000 -0.001 51040 2013-06-16T16:47:52.815 -0.000 0.000 0.000 51054 2013-06-17T19:55:52.815 0.004 0.000 -0.000 51068 2013-06-19T01:12:52.815 0.001 0.000 0.001 51081 2013-06-20T01:14:52.815 0.004 0.000 0.000 51100 2013-06-21T15:16:52.815 -0.001 -0.000 0.001 51111 2013-06-22T14:15:52.815 0.001 0.000 0.000 51125 2013-06-23T16:39:52.815 -0.001 -0.000 0.001 51141 2013-06-25T00:14:52.815 -0.004 -0.000 0.004 51151 2013-06-25T20:46:52.815 0.002 -0.000 0.001 51165 2013-06-27T00:43:52.815 0.001 0.000 0.001 51185 2013-06-28T15:08:52.815 -0.001 0.000 0.001 51202 2013-06-30T00:41:52.815 0.006 -0.000 -0.006 51213 2013-06-30T22:08:52.815 -0.005 -0.000 0.003