2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Nov 6 10:25:35 PST 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 60084 through 61200): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2015 JUL 01 00:01:08.184 2015 OCT 01 01:01:08.182 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_od60010-60097_rec_v1.bsp spk_m_od60096-60187_rec_v1.bsp spk_m_od60186-60267_rec_v1.bsp spk_m_od60266-60342_rec_v1.bsp spk_m_od60341-60435_rec_v1.bsp spk_m_od60430-60526_rec_v1.bsp spk_m_od60516-60599_rec_v1.bsp spk_m_od60597-60686_rec_v1.bsp spk_m_od60685-60772_rec_v1.bsp spk_m_od60770-60869_rec_v1.bsp spk_m_od60856-60945_rec_v1.bsp spk_m_od60940-61027_rec_v1.bsp spk_m_od61025-61113_rec_v1.bsp spk_m_od61110-61204_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_ext44.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 60096 2015-07-02T00:34:51.815 0.024 0.000 -0.002 60114 2015-07-03T12:38:51.815 0.029 -0.000 -0.001 60134 2015-07-05T03:48:51.815 0.027 -0.000 -0.003 60146 2015-07-06T03:08:51.816 -0.017 -0.000 0.001 60157 2015-07-07T01:15:04.816 0.016 0.000 -0.002 60177 2015-07-08T17:09:13.816 0.005 -0.000 -0.000 60186 2015-07-09T11:29:51.816 -0.021 -0.000 -0.003 60205 2015-07-11T01:36:51.816 0.002 0.000 -0.000 60222 2015-07-12T10:56:51.816 -0.013 0.000 -0.001 60236 2015-07-13T14:40:27.816 -0.003 0.000 -0.000 60249 2015-07-14T16:23:00.816 0.008 0.000 0.000 60266 2015-07-16T01:18:35.816 -0.024 -0.000 -0.003 60289 2015-07-17T22:13:38.816 0.023 0.000 -0.003 60302 2015-07-19T01:03:29.816 0.008 -0.000 0.000 60323 2015-07-20T17:35:35.816 -0.020 0.000 0.001 60341 2015-07-22T05:44:51.816 0.008 0.001 0.001 60359 2015-07-23T16:06:51.816 0.022 0.000 -0.003 60377 2015-07-25T04:41:51.816 0.001 -0.000 0.000 60391 2015-07-26T08:25:51.816 -0.014 -0.000 -0.003 60402 2015-07-27T06:38:01.816 -0.021 -0.000 -0.001 60420 2015-07-28T17:07:38.816 -0.002 0.000 0.000 60430 2015-07-29T13:18:32.816 -0.011 -0.000 -0.002 60456 2015-07-31T17:09:16.816 -0.028 -0.000 -0.005 60479 2015-08-02T14:20:20.816 -0.011 -0.000 -0.002 60496 2015-08-04T00:35:30.816 -0.021 -0.000 0.001 60509 2015-08-05T01:28:41.816 -0.003 0.000 -0.001 60516 2015-08-05T14:28:52.816 0.025 0.000 -0.006 60542 2015-08-07T17:56:48.816 -0.029 -0.000 0.007 60559 2015-08-09T04:36:02.816 0.008 0.000 0.002 60577 2015-08-10T15:41:33.816 0.025 -0.000 0.002 60586 2015-08-11T09:35:51.816 0.021 0.000 0.004 60597 2015-08-12T07:28:27.816 -0.042 0.000 -0.010 60626 2015-08-14T17:08:14.817 -0.011 0.000 -0.002 60644 2015-08-16T04:31:01.817 0.015 -0.000 0.004 60656 2015-08-17T03:31:04.817 0.033 -0.001 -0.005 60668 2015-08-18T04:26:51.817 -0.046 -0.001 0.002 60685 2015-08-19T13:03:23.817 0.020 -0.001 0.001 60706 2015-08-21T07:41:20.817 -0.003 -0.000 0.001 60727 2015-08-22T23:31:06.817 0.014 -0.000 -0.004 60747 2015-08-24T15:20:51.817 0.008 -0.000 -0.001 60763 2015-08-25T23:58:51.817 0.049 0.000 0.008 60770 2015-08-26T12:58:51.817 -0.028 -0.000 0.000 60795 2015-08-28T15:28:51.817 0.012 0.000 -0.001 60812 2015-08-29T23:34:51.817 0.005 0.000 -0.002 60824 2015-08-30T23:51:51.817 0.005 -0.000 0.001 60848 2015-09-01T22:56:22.817 0.008 -0.000 -0.002 60856 2015-09-02T14:58:51.817 0.004 -0.000 0.000 60871 2015-09-03T20:35:51.817 -0.003 0.000 -0.000 60884 2015-09-04T22:42:51.817 0.041 0.000 0.014 60903 2015-09-06T11:32:51.817 -0.000 -0.000 0.000 60921 2015-09-07T23:06:58.817 0.019 0.000 -0.006 60940 2015-09-09T13:58:03.817 -0.023 -0.000 0.000 60966 2015-09-11T16:48:45.817 -0.004 -0.000 -0.002 60982 2015-09-13T00:08:51.817 -0.002 -0.000 -0.000 60990 2015-09-13T16:04:22.817 0.016 -0.000 0.005 61007 2015-09-15T01:11:51.817 -0.024 -0.000 0.005 61025 2015-09-16T12:37:41.817 -0.008 -0.000 0.003 61054 2015-09-18T23:15:08.817 -0.001 0.000 0.000 61069 2015-09-20T03:32:04.817 0.001 0.000 -0.000 61084 2015-09-21T09:28:51.817 0.007 0.000 -0.001 61095 2015-09-22T08:37:51.817 -0.004 0.000 0.002 61110 2015-09-23T14:11:51.817 -0.028 -0.000 0.009 61124 2015-09-24T16:06:51.817 0.024 0.000 -0.010 61144 2015-09-26T07:58:51.817 -0.021 -0.000 0.005 61163 2015-09-27T22:08:51.817 -0.003 0.000 -0.001 61176 2015-09-28T22:54:33.817 0.001 0.000 -0.001