Mars Reconnaissance Orbiter Extended Science Phase SPK, MRO NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Nov 21 10:20:29 PST 2016 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 Extended Science Phase of the MRO mission (orbits 46542 through 47722): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 JUL 01 00:01:09.000 2016 OCT 01 01:01:08.182 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the MRO NAV team during the Extended 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_rec46567_46487_46567_r-v1.bsp spk_psp_rec46657_46564_46657_r-v1.bsp spk_psp_rec46759_46654_46759_r-v1.bsp spk_psp_rec46836_46756_46836_r-v1.bsp spk_psp_rec46925_46833_46925_r-v1.bsp spk_psp_rec47028_46923_47028_r-v1.bsp spk_psp_rec47118_47025_47118_r-v1.bsp spk_psp_rec47195_47115_47195_r-v1.bsp spk_psp_rec47297_47192_47297_r-v1.bsp spk_psp_rec47383_47294_47383_r-v1.bsp spk_psp_rec47475_47380_47475_r-v1.bsp spk_psp_rec47564_47472_47564_r-v1.bsp spk_psp_rec47656_47563_47656_r-v1.bsp spk_psp_rec47656_47563_47656_r-v2.bsp spk_psp_rec47741_47653_47741_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_psp40.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 46554 2016-07-01T23:58:51.815 -0.007 0.000 -0.000 46564 2016-07-02T17:54:01.815 -0.001 0.000 0.000 46584 2016-07-04T08:04:46.815 -0.005 0.000 -0.000 46604 2016-07-05T21:49:51.816 0.011 0.000 0.004 46618 2016-07-06T23:58:51.816 -0.010 0.000 -0.003 46631 2016-07-07T23:58:51.816 -0.008 -0.000 -0.000 46644 2016-07-08T23:58:51.816 0.006 0.000 -0.002 46654 2016-07-09T18:15:00.816 -0.021 0.000 0.004 46670 2016-07-10T23:45:51.816 -0.005 -0.000 -0.001 46678 2016-07-11T16:09:51.816 0.001 0.000 0.000 46691 2016-07-12T16:04:51.816 -0.000 -0.000 0.000 46713 2016-07-14T08:10:51.816 0.009 0.000 0.002 46733 2016-07-15T22:52:51.816 -0.015 0.000 -0.002 46745 2016-07-16T21:09:51.816 0.005 -0.000 -0.000 46756 2016-07-17T16:59:00.816 -0.016 0.000 0.002 46778 2016-07-19T11:04:51.816 -0.007 0.000 -0.001 46798 2016-07-20T23:10:51.816 0.002 0.000 0.000 46806 2016-07-21T14:08:51.816 0.012 0.000 0.003 46823 2016-07-22T23:09:51.816 0.005 0.000 0.000 46833 2016-07-23T16:59:00.816 -0.011 0.000 0.001 46857 2016-07-25T13:31:51.816 -0.008 -0.000 -0.002 46870 2016-07-26T15:29:51.816 -0.002 0.000 -0.000 46887 2016-07-27T22:53:51.816 0.000 -0.000 0.000 46913 2016-07-29T22:48:51.816 0.007 0.000 -0.002 46923 2016-07-30T18:24:00.816 -0.011 -0.000 -0.002 46946 2016-08-01T11:59:51.816 0.011 0.000 0.002 46955 2016-08-02T06:28:51.816 -0.020 -0.000 -0.006 46986 2016-08-04T14:38:51.816 0.003 -0.000 0.001 47003 2016-08-05T22:28:51.816 -0.005 -0.000 -0.001 47025 2016-08-07T16:44:00.816 -0.013 0.000 0.002 47037 2016-08-08T14:58:51.816 -0.005 -0.000 0.001 47049 2016-08-09T14:12:51.816 -0.009 -0.000 -0.002 47067 2016-08-10T22:16:51.816 -0.004 -0.000 -0.001 47080 2016-08-11T23:57:51.816 0.004 -0.000 0.000 47092 2016-08-12T22:07:51.817 0.001 -0.000 -0.000 47104 2016-08-13T20:13:51.817 0.002 0.000 -0.000 47115 2016-08-14T16:26:00.817 0.001 0.000 -0.000 47127 2016-08-15T14:30:51.817 -0.010 -0.000 -0.002 47138 2016-08-16T12:43:51.817 0.011 0.000 0.002 47151 2016-08-17T12:07:51.817 -0.004 0.000 0.001 47165 2016-08-18T14:42:51.817 0.008 -0.000 -0.001 47182 2016-08-19T21:22:51.817 -0.017 -0.000 -0.003 47192 2016-08-20T16:27:00.817 -0.006 -0.000 0.000 47215 2016-08-22T11:14:51.817 -0.001 0.000 -0.000 47229 2016-08-23T14:21:51.817 -0.005 0.000 0.000 47246 2016-08-24T21:43:51.817 0.025 -0.000 -0.005 47254 2016-08-25T13:16:51.817 -0.005 -0.000 0.000 47271 2016-08-26T21:29:51.817 -0.005 -0.000 -0.001 47280 2016-08-27T12:44:51.817 0.015 0.000 0.002 47294 2016-08-28T15:36:00.817 0.002 -0.000 -0.000 47306 2016-08-29T14:16:51.817 0.002 -0.000 -0.000 47319 2016-08-30T14:21:51.817 0.010 -0.000 -0.002 47336 2016-08-31T21:27:51.817 0.002 0.000 0.000 47345 2016-09-01T14:22:51.817 -0.015 -0.000 -0.001 47360 2016-09-02T19:16:51.817 0.000 0.000 -0.000 47380 2016-09-04T09:15:00.817 -0.003 -0.000 -0.000 47396 2016-09-05T14:16:51.817 0.010 -0.000 -0.001 47409 2016-09-06T14:05:51.817 -0.003 -0.000 -0.000 47422 2016-09-07T14:16:51.817 -0.003 0.000 -0.000 47434 2016-09-08T14:11:51.817 0.003 0.000 0.000 47442 2016-09-09T05:06:51.817 0.022 0.000 0.002 47464 2016-09-10T20:59:51.817 -0.011 -0.000 -0.001 47472 2016-09-11T12:18:00.817 0.021 -0.000 -0.002 47486 2016-09-12T14:06:51.817 0.014 0.000 0.001 47499 2016-09-13T14:06:51.817 -0.002 -0.000 -0.000 47515 2016-09-14T21:00:51.817 -0.004 0.000 0.000 47524 2016-09-15T14:00:51.817 0.013 0.000 -0.001 47542 2016-09-16T23:56:51.817 -0.045 -0.000 0.001 47554 2016-09-17T21:03:51.817 -0.021 -0.000 -0.002 47563 2016-09-18T15:11:00.817 -0.017 -0.000 0.000 47575 2016-09-19T13:55:51.817 -0.006 0.000 -0.000 47587 2016-09-20T11:42:51.817 -0.033 0.000 0.002 47601 2016-09-21T13:16:51.817 0.008 0.000 0.000 47614 2016-09-22T13:35:51.817 -0.038 -0.000 -0.001 47631 2016-09-23T20:57:51.817 0.016 0.000 0.001 47640 2016-09-24T13:51:51.817 -0.007 -0.001 -0.000 47653 2016-09-25T15:16:00.817 -0.023 0.000 0.001 47667 2016-09-26T17:47:51.817 0.015 0.000 -0.000 47678 2016-09-27T13:19:51.817 0.032 -0.000 0.001 47695 2016-09-28T20:46:51.817 0.016 0.000 0.000 47703 2016-09-29T12:59:51.817 -0.018 0.000 0.000 47722 2016-09-30T23:59:51.817 0.006 -0.000 0.000