Mars Reconnaissance Orbiter Extended Science Phase SPK, MRO NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Oct 29 06:32:06 PDT 2024 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 84044 through 85224): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2024 JUL 01 00:01:10.000 2024 OCT 01 01:01:09.182 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_rec84133_84040_84133_r-v1.bsp spk_psp_rec84221_84132_84221_r-v1.bsp spk_psp_rec84310_84221_84310_r-v1.bsp spk_psp_rec84399_84308_84399_r-v1.bsp spk_psp_rec84488_84397_84488_r-v1.bsp spk_psp_rec84573_84487_84573_r-v1.bsp spk_psp_rec84668_84571_84668_r-v1.bsp spk_psp_rec84759_84666_84759_r-v1.bsp spk_psp_rec84847_84757_84847_r-v1.bsp spk_psp_rec84925_84845_84925_r-v1.bsp spk_psp_rec85029_84923_85029_r-v1.bsp spk_psp_rec85117_85027_85117_r-v1.bsp spk_psp_rec85210_85115_85210_r-v1.bsp spk_psp_rec85300_85208_85300_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_psp72.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 84056 2024-07-01T23:56:50.815 -0.000 0.000 0.001 84066 2024-07-02T18:19:50.815 -0.000 0.000 -0.001 84081 2024-07-03T22:39:50.815 0.000 0.000 0.006 84093 2024-07-04T21:09:50.816 -0.001 0.000 -0.006 84106 2024-07-05T21:09:50.816 -0.000 0.000 -0.001 84115 2024-07-06T14:19:50.816 -0.000 0.000 -0.004 84132 2024-07-07T21:10:50.816 0.001 -0.000 -0.006 84145 2024-07-08T21:30:50.816 0.000 0.000 -0.003 84153 2024-07-09T13:24:50.816 0.000 0.000 0.002 84166 2024-07-10T13:43:50.816 0.000 -0.000 -0.001 84179 2024-07-11T14:02:50.816 0.000 -0.000 0.002 84191 2024-07-12T12:25:50.816 -0.000 -0.000 -0.001 84205 2024-07-13T14:40:50.816 0.000 -0.000 0.003 84221 2024-07-14T19:35:50.816 -0.000 -0.000 0.008 84234 2024-07-15T20:56:50.816 -0.000 0.000 -0.009 84247 2024-07-16T21:15:50.816 0.000 -0.000 0.002 84265 2024-07-18T06:55:50.816 0.000 0.000 0.005 84284 2024-07-19T18:28:50.816 -0.000 0.000 -0.011 84295 2024-07-20T15:02:50.816 0.000 0.000 0.008 84308 2024-07-21T14:20:50.816 -0.000 -0.000 0.005 84324 2024-07-22T21:12:50.816 0.000 0.000 0.004 84337 2024-07-23T21:36:50.816 -0.000 0.000 -0.010 84349 2024-07-24T20:03:50.816 0.000 0.000 0.018 84362 2024-07-25T20:22:50.816 -0.000 -0.000 -0.029 84376 2024-07-26T22:33:50.816 0.000 -0.000 0.032 84385 2024-07-27T15:23:50.816 -0.000 -0.000 -0.008 84397 2024-07-28T12:50:50.816 0.001 0.000 -0.041 84418 2024-07-30T05:07:50.816 0.000 -0.000 0.036 84434 2024-07-31T11:02:50.816 0.000 -0.000 -0.021 84449 2024-08-01T14:30:50.816 0.000 0.000 -0.025 84465 2024-08-02T20:51:50.816 -0.000 -0.000 -0.067 84477 2024-08-03T19:28:50.816 0.000 -0.000 0.029 84487 2024-08-04T13:20:50.816 -0.000 0.000 -0.027 84495 2024-08-05T05:07:50.816 0.000 -0.000 -0.002 84518 2024-08-07T00:08:50.816 -0.000 -0.000 0.028 84535 2024-08-08T07:36:50.816 0.000 0.000 -0.004 84556 2024-08-09T23:14:50.816 0.000 0.000 -0.017 84571 2024-08-11T02:27:50.816 0.000 -0.000 -0.008 84590 2024-08-12T14:31:50.817 0.000 -0.000 -0.011 84606 2024-08-13T20:47:50.817 -0.000 0.000 0.008 84620 2024-08-14T21:37:26.472 -0.000 0.000 -0.000 84623 2024-08-15T04:35:50.817 -0.000 -0.000 0.012 84640 2024-08-16T12:23:50.817 0.000 0.000 -0.001 84656 2024-08-17T18:01:50.817 -0.000 -0.000 0.004 84666 2024-08-18T12:02:50.817 0.000 0.000 0.009 84693 2024-08-20T15:31:50.817 0.001 -0.000 -0.019 84704 2024-08-21T12:07:50.817 -0.000 0.000 -0.000 84722 2024-08-22T21:31:50.817 -0.001 -0.000 0.007 84735 2024-08-23T22:07:50.817 0.000 0.000 -0.010 84748 2024-08-24T22:26:50.817 -0.000 -0.000 0.009 84757 2024-08-25T14:48:50.817 0.000 0.000 -0.003 84777 2024-08-27T04:33:50.817 0.000 -0.000 -0.010 84794 2024-08-28T11:55:50.817 0.000 -0.000 0.001 84812 2024-08-29T21:32:50.817 0.000 -0.000 -0.002 84824 2024-08-30T20:36:50.817 -0.000 0.000 0.010 84833 2024-08-31T13:26:50.817 0.000 0.000 -0.007 84845 2024-09-01T10:54:50.817 -0.000 -0.000 -0.004 84858 2024-09-02T11:54:50.817 -0.000 0.000 0.005 84876 2024-09-03T21:35:50.817 0.000 0.000 -0.001 84890 2024-09-04T23:57:50.817 -0.000 0.000 0.003 84903 2024-09-05T23:57:50.817 0.000 0.000 -0.003 84915 2024-09-06T22:48:50.817 -0.000 -0.000 0.008 84923 2024-09-07T12:49:50.817 0.000 0.000 0.003 84949 2024-09-09T14:24:50.817 -0.000 -0.000 0.006 84962 2024-09-10T14:43:50.817 0.000 0.000 -0.002 84974 2024-09-11T12:33:50.817 0.000 -0.000 0.002 84992 2024-09-12T22:49:50.817 -0.001 -0.000 0.011 85005 2024-09-13T23:08:50.817 0.000 -0.000 -0.005 85017 2024-09-14T21:35:50.817 -0.000 -0.000 0.004 85027 2024-09-15T15:22:50.817 -0.000 0.000 -0.001 85046 2024-09-17T03:56:44.514 -0.000 0.000 0.000 85056 2024-09-17T22:31:50.817 -0.000 0.000 0.008 85068 2024-09-18T20:58:50.817 0.001 -0.000 -0.013 85082 2024-09-19T23:08:50.817 -0.000 -0.000 0.008 85095 2024-09-20T23:27:50.817 0.000 -0.000 -0.003 85106 2024-09-21T20:01:50.817 -0.000 -0.000 0.002 85115 2024-09-22T11:52:50.817 -0.000 0.000 -0.000 85134 2024-09-23T23:57:50.817 -0.000 -0.000 0.001 85151 2024-09-25T08:11:50.817 -0.000 -0.000 0.002 85163 2024-09-26T06:37:50.817 -0.001 0.000 0.002 85184 2024-09-27T21:38:50.817 0.001 0.000 -0.009 85196 2024-09-28T20:20:50.817 -0.000 0.000 0.005 85208 2024-09-29T17:48:50.817 0.000 -0.000 0.001 85223 2024-09-30T22:49:50.817 0.000 0.000 -0.002