2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Feb 25 18:44:22 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 56768 through 57884): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2014 OCT 01 00:01:07.182 2015 JAN 01 01:01:07.183 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_od56691-56769_rec_v1.bsp spk_m_od56767-56866_rec_v1.bsp spk_m_od56862-56954_rec_v1.bsp spk_m_od56953-57044_rec_v1.bsp spk_m_od57038-57117_rec_v1.bsp spk_m_od57116-57202_rec_v1.bsp spk_m_od57201-57289_rec_v1.bsp spk_m_od57288-57372_rec_v1.bsp spk_m_od57371-57457_rec_v1.bsp spk_m_od57456-57542_rec_v1.bsp spk_m_od57542-57627_rec_v1.bsp spk_m_od57626-57712_rec_v1.bsp spk_m_od57711-57877_rec_v1.bsp spk_m_od57876-57975_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_ext41.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 56788 2014-10-02T18:43:52.817 0.003 -0.000 -0.003 56808 2014-10-04T10:15:52.817 -0.002 -0.000 0.001 56825 2014-10-05T19:20:52.817 -0.002 0.000 0.000 56849 2014-10-07T19:14:15.817 0.006 0.000 -0.005 56861 2014-10-08T18:17:52.817 -0.000 -0.000 -0.000 56879 2014-10-10T06:33:52.817 -0.005 -0.000 0.004 56900 2014-10-11T23:33:52.817 0.008 -0.000 -0.001 56916 2014-10-13T06:41:42.817 0.005 0.000 0.004 56934 2014-10-14T19:08:52.817 0.003 -0.000 -0.002 56952 2014-10-16T05:35:22.817 -0.001 0.000 -0.001 56976 2014-10-18T06:12:52.817 0.001 -0.000 -0.001 56994 2014-10-19T16:58:52.817 0.007 -0.002 0.000 57007 2014-10-20T18:58:52.817 0.000 -0.000 0.000 57027 2014-10-22T10:58:52.817 -0.000 0.000 -0.000 57037 2014-10-23T05:32:06.817 0.002 0.000 0.001 57060 2014-10-25T04:11:16.817 0.003 -0.000 -0.002 57084 2014-10-27T02:38:38.817 -0.007 0.000 -0.002 57097 2014-10-28T05:15:52.817 0.004 -0.000 -0.003 57115 2014-10-29T16:06:52.817 -0.007 0.000 -0.003 57139 2014-10-31T15:27:52.817 -0.002 0.000 -0.001 57152 2014-11-01T17:57:52.817 0.004 0.000 -0.003 57173 2014-11-03T11:26:52.817 0.002 0.000 -0.002 57190 2014-11-04T19:53:02.817 -0.007 -0.000 -0.005 57200 2014-11-05T15:31:55.817 -0.002 0.000 -0.001 57225 2014-11-07T18:10:14.817 -0.005 0.000 0.003 57246 2014-11-09T11:33:03.817 0.003 0.000 -0.002 57265 2014-11-11T01:12:52.817 0.002 0.000 -0.002 57287 2014-11-12T20:02:52.817 -0.006 0.000 -0.001 57307 2014-11-14T11:28:52.817 -0.006 -0.000 -0.002 57321 2014-11-15T15:52:52.817 0.003 -0.000 -0.002 57339 2014-11-17T02:38:52.817 -0.004 0.000 -0.001 57355 2014-11-18T11:01:12.817 0.010 -0.000 -0.007 57370 2014-11-19T15:56:59.817 -0.000 0.000 0.000 57390 2014-11-21T08:07:58.817 -0.000 -0.000 0.000 57408 2014-11-22T18:47:26.817 -0.005 -0.000 -0.004 57420 2014-11-23T18:47:26.817 0.004 -0.000 0.001 57440 2014-11-25T10:57:30.817 0.002 0.000 -0.002 57455 2014-11-26T16:22:12.817 0.007 0.000 -0.005 57480 2014-11-28T17:58:24.816 0.005 -0.000 -0.004 57505 2014-11-30T18:47:22.816 -0.006 0.000 -0.000 57517 2014-12-01T18:43:52.816 -0.004 0.000 0.002 57541 2014-12-03T17:27:23.816 0.004 0.000 0.003 57558 2014-12-05T04:05:02.816 -0.007 0.000 0.005 57578 2014-12-06T18:46:52.816 0.002 -0.000 0.001 57594 2014-12-08T02:21:52.816 -0.008 -0.000 -0.004 57610 2014-12-09T10:48:52.816 -0.001 0.000 0.001 57625 2014-12-10T15:32:52.816 -0.008 -0.000 -0.005 57645 2014-12-12T07:58:52.816 -0.010 -0.000 0.008 57662 2014-12-13T17:33:52.816 0.007 -0.000 -0.005 57675 2014-12-14T18:46:52.816 -0.002 -0.000 0.000 57695 2014-12-16T10:48:52.816 0.002 -0.000 -0.001 57710 2014-12-17T15:23:52.816 0.002 -0.000 0.002 57730 2014-12-19T07:28:52.816 0.006 0.000 -0.002 57744 2014-12-20T10:46:52.816 0.005 -0.000 0.003 57762 2014-12-21T23:10:52.816 -0.007 0.000 0.005 57780 2014-12-23T10:42:52.816 -0.004 0.000 0.003 57798 2014-12-24T22:18:52.816 -0.004 0.000 0.003 57820 2014-12-26T17:21:12.816 0.004 0.000 -0.002 57837 2014-12-28T03:43:32.816 -0.004 -0.000 0.000 57857 2014-12-29T18:51:55.816 -0.002 0.000 0.001 57875 2014-12-31T05:49:52.816 0.002 -0.000 -0.000