Mars Reconnaissance Orbiter Primary Science Phase SPK, MRO NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Feb 29 10:37:37 PST 2008 Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the Mars Reconnaissance Orbiter (MRO) spacecraft. The NAIF ID code for MRO is -74. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Primary Science Phase of the MRO mission (orbits 5526 through 6706): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 OCT 01 00:01:05.182 2008 JAN 01 01:01:05.183 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the MRO NAV team during the Primary Science 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 MRO project data base by the MRO 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 DE414 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_psp_rec05532_05449_05532_r-v1.bsp spk_psp_rec05612_05532_05612_r-v1.bsp spk_psp_rec05714_05611_05714_r-v1.bsp spk_psp_rec05799_05714_05799_r-v1.bsp spk_psp_rec05891_05799_05891_r-v1.bsp spk_psp_rec05991_05891_05991_r-v1.bsp spk_psp_rec06083_05991_06083_r-v1.bsp spk_psp_rec06148_06083_06148_r-v1.bsp spk_psp_rec06244_06148_06244_r-v1.bsp spk_psp_rec06346_06243_06346_r-v1.bsp spk_psp_rec06425_06345_06425_r-v1.bsp spk_psp_rec06517_06424_06517_r-v1.bsp spk_psp_rec06617_06515_06617_r-v1.bsp spk_psp_rec06695_06616_06695_r-v1.bsp spk_psp_rec06794_06695_06794_r-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 ./mro_psp5.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 5526 2007-10-01T00:00:00.000 0.000 0.000 0.000 5532 2007-10-01T11:43:54.817 -0.000 0.000 -0.001 5556 2007-10-03T08:39:54.817 0.000 0.000 -0.000 5570 2007-10-04T10:47:54.817 0.000 0.000 0.000 5590 2007-10-06T00:12:54.817 -0.000 -0.000 -0.000 5611 2007-10-07T15:28:54.817 0.000 0.000 0.001 5633 2007-10-09T08:36:54.817 0.000 0.000 0.002 5655 2007-10-11T01:44:54.817 0.000 -0.000 -0.000 5673 2007-10-12T11:23:54.817 0.000 0.000 0.001 5694 2007-10-14T02:43:54.817 -0.000 -0.000 -0.002 5714 2007-10-15T16:05:54.817 0.000 0.000 0.002 5733 2007-10-17T03:44:54.817 0.000 -0.000 0.003 5751 2007-10-18T13:17:54.817 -0.000 0.000 -0.003 5775 2007-10-20T10:10:54.817 0.000 -0.000 0.002 5799 2007-10-22T07:04:54.817 -0.000 0.000 0.001 5815 2007-10-23T12:58:54.817 -0.000 0.000 -0.004 5833 2007-10-24T22:38:54.817 -0.000 -0.000 -0.004 5853 2007-10-26T12:02:54.817 -0.000 0.000 -0.005 5871 2007-10-27T22:22:54.817 -0.001 -0.000 0.020 5891 2007-10-29T11:07:54.817 0.000 -0.000 0.062 5913 2007-10-31T04:15:54.817 -0.000 0.000 0.012 5929 2007-11-01T10:08:54.817 -0.000 -0.000 0.008 5949 2007-11-02T23:33:54.817 0.000 0.000 -0.004 5970 2007-11-04T14:53:54.817 0.000 -0.000 -0.001 5991 2007-11-06T06:08:54.817 0.000 -0.000 -0.002 6009 2007-11-07T15:58:54.817 -0.005 0.000 0.085 6029 2007-11-09T05:36:54.817 0.000 0.000 0.000 6048 2007-11-10T16:58:54.817 -0.000 -0.000 0.002 6066 2007-11-12T02:23:54.817 0.000 -0.000 -0.003 6083 2007-11-13T10:13:54.817 0.000 -0.000 -0.002 6103 2007-11-14T23:37:49.817 0.000 0.002 0.001 6124 2007-11-16T14:53:54.817 -0.000 -0.000 0.000 6148 2007-11-18T11:43:54.817 0.000 0.000 -0.001 6166 2007-11-19T21:28:54.817 -0.000 -0.000 0.001 6186 2007-11-21T10:51:49.817 0.000 -0.000 -0.001 6206 2007-11-23T00:23:54.817 0.000 0.000 -0.001 6224 2007-11-24T09:53:54.817 0.000 0.000 -0.001 6243 2007-11-25T21:25:54.817 -0.000 0.000 0.000 6264 2007-11-27T12:44:54.817 0.000 0.000 -0.001 6288 2007-11-29T09:36:54.816 -0.000 0.000 0.002 6295 2007-11-29T22:28:54.816 0.000 0.000 0.000 6307 2007-11-30T21:58:54.816 0.000 0.000 0.001 6329 2007-12-02T14:15:54.816 -0.000 -0.000 0.001 6345 2007-12-03T20:10:54.816 -0.000 0.000 0.000 6365 2007-12-05T09:28:54.816 -0.000 0.000 0.000 6384 2007-12-06T21:13:54.816 -0.000 -0.000 0.000 6405 2007-12-08T12:23:54.816 -0.000 -0.000 0.000 6424 2007-12-09T23:55:24.816 0.000 -0.000 -0.000 6442 2007-12-11T09:36:54.816 0.000 -0.000 -0.000 6455 2007-12-12T09:58:54.816 -0.000 -0.000 0.001 6468 2007-12-13T10:14:54.816 0.000 -0.000 -0.001 6480 2007-12-14T08:38:54.816 -0.000 0.000 0.000 6499 2007-12-15T20:11:54.816 0.000 0.000 -0.000 6515 2007-12-17T02:43:54.816 -0.001 0.000 -0.000 6532 2007-12-18T10:08:54.816 0.000 0.000 -0.001 6552 2007-12-19T23:23:54.816 -0.000 -0.000 0.001 6574 2007-12-21T16:33:54.816 0.000 -0.000 -0.000 6595 2007-12-23T07:53:54.816 -0.001 -0.000 0.001 6616 2007-12-24T22:58:54.816 -0.001 -0.000 0.001 6636 2007-12-26T12:13:54.816 -0.000 0.000 0.000 6656 2007-12-28T01:48:54.816 0.000 0.000 -0.000 6675 2007-12-29T13:18:54.816 -0.000 0.000 0.000 6695 2007-12-31T02:48:54.816 0.000 -0.000 -0.000