Mars Reconnaissance Orbiter Primary Science Phase SPK, MRO NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Jul 19 11:20:02 PDT 2007 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 3178 through 4345): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2007 APR 01 00:01:05.185 2007 JUL 01 01:01:05.184 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_rec03209_03105_03209_r-v1.bsp spk_psp_rec03294_03209_03294_r-v1.bsp spk_psp_rec03388_03293_03388_r-v1.bsp spk_psp_rec03451_03388_03451_r-v1.bsp spk_psp_rec03565_03451_03565_r-v1.bsp spk_psp_rec03649_03565_03649_r-v1.bsp spk_psp_rec03736_03648_03736_r-v1.bsp spk_psp_rec03809_03735_03809_r-v1.bsp spk_psp_rec03915_03809_03915_r-v1.bsp spk_psp_rec04019_03915_04019_r-v1.bsp spk_psp_rec04101_04018_04101_r-v1.bsp spk_psp_rec04182_04100_04182_r-v1.bsp spk_psp_rec04276_04181_04276_r-v1.bsp spk_psp_rec04330_04276_04330_r-v1.bsp spk_psp_rec04431_04330_04431_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_psp3.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 3189 2007-04-01T21:52:54.814 0.000 -0.000 -0.000 3209 2007-04-03T11:14:54.814 -0.001 -0.000 0.002 3233 2007-04-05T08:13:54.814 -0.000 -0.000 0.000 3253 2007-04-06T21:33:54.814 -0.001 -0.000 0.000 3272 2007-04-08T10:28:54.814 0.000 0.000 0.000 3293 2007-04-10T00:23:54.814 0.000 0.000 -0.002 3313 2007-04-11T13:48:54.814 -0.000 -0.000 0.001 3332 2007-04-13T01:23:54.814 0.000 -0.000 -0.001 3350 2007-04-14T10:58:54.814 0.001 0.000 -0.001 3371 2007-04-16T02:18:54.814 -0.001 -0.000 0.002 3388 2007-04-17T09:58:54.814 0.001 -0.000 -0.002 3402 2007-04-18T12:33:54.814 0.000 -0.000 -0.000 3413 2007-04-19T08:43:54.814 0.000 0.000 -0.000 3427 2007-04-20T10:55:54.814 0.000 -0.000 -0.001 3451 2007-04-22T07:49:54.814 -0.001 0.000 0.002 3471 2007-04-23T21:13:54.814 0.000 0.000 -0.002 3497 2007-04-25T21:48:54.814 -0.000 0.000 0.001 3522 2007-04-27T20:28:54.814 0.000 0.000 -0.001 3542 2007-04-29T09:58:54.814 0.000 -0.000 -0.001 3565 2007-05-01T05:00:54.814 -0.000 -0.000 0.001 3588 2007-05-03T00:01:54.814 -0.000 0.000 0.001 3608 2007-05-04T13:33:54.814 -0.000 -0.000 0.000 3630 2007-05-06T06:38:54.814 -0.000 0.000 0.000 3648 2007-05-07T16:18:54.814 -0.000 -0.000 0.001 3668 2007-05-09T05:43:54.814 -0.003 -0.000 0.014 3691 2007-05-11T00:38:54.814 0.004 0.000 -0.016 3716 2007-05-12T23:24:54.814 0.000 0.000 -0.001 3735 2007-05-14T10:57:54.814 0.000 -0.000 -0.001 3752 2007-05-15T18:38:54.814 0.000 -0.000 -0.001 3773 2007-05-17T09:58:54.814 0.000 0.000 -0.001 3787 2007-05-18T12:08:54.814 -0.000 -0.000 0.001 3809 2007-05-20T05:18:54.814 0.000 -0.000 -0.000 3828 2007-05-21T18:28:54.814 0.000 -0.000 -0.001 3845 2007-05-23T00:28:54.814 -0.002 0.000 0.009 3858 2007-05-24T00:56:54.814 0.001 0.000 -0.008 3875 2007-05-25T08:43:54.814 0.000 0.000 -0.004 3896 2007-05-27T00:03:54.814 -0.000 0.000 0.001 3915 2007-05-28T11:33:54.815 -0.001 -0.000 0.003 3928 2007-05-29T11:52:54.815 -0.000 -0.000 0.002 3942 2007-05-30T14:03:54.815 -0.000 -0.000 0.002 3958 2007-05-31T19:58:54.815 0.000 -0.000 -0.000 3973 2007-06-02T00:07:54.815 0.000 0.000 -0.004 3996 2007-06-03T19:03:54.815 -0.000 -0.000 0.001 4018 2007-06-05T12:13:54.815 -0.000 0.000 0.002 4038 2007-06-07T01:43:54.815 0.000 -0.000 -0.001 4056 2007-06-08T11:16:54.815 -0.000 0.000 0.003 4070 2007-06-09T14:01:54.815 0.000 -0.000 -0.000 4086 2007-06-10T19:22:54.815 0.000 0.000 -0.002 4100 2007-06-11T21:36:24.815 -0.000 -0.000 0.001 4120 2007-06-13T10:58:54.815 -0.000 0.000 0.002 4139 2007-06-14T22:28:54.815 0.000 0.000 -0.002 4159 2007-06-16T11:53:54.815 0.000 0.000 0.001 4181 2007-06-18T05:13:54.815 0.000 0.000 -0.003 4199 2007-06-19T14:48:54.815 0.000 -0.000 -0.003 4221 2007-06-21T07:53:54.815 0.000 0.000 -0.004 4240 2007-06-22T19:23:54.815 -0.000 -0.000 0.008 4259 2007-06-24T06:56:54.815 -0.000 0.000 0.017 4276 2007-06-25T14:42:54.815 0.000 0.000 -0.026 4297 2007-06-27T06:01:54.815 0.000 -0.000 -0.008 4311 2007-06-28T08:10:54.815 -0.000 -0.000 0.008 4330 2007-06-29T19:46:54.815 0.000 -0.000 -0.057 4345 2007-06-30T23:44:54.815 -0.000 0.000 -0.013