MAVEN Reconstructed SPK, NAV Solution, 2022-07-01 to 2022-10-01, Version 1 =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Nov 1 10:37:33 PDT 2022 Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the Mars Atmosphere and Volatile Evolution Mission (MAVEN) spacecraft. The NAIF ID code for MAVEN is -202. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the orbital phase of the MAVEN mission (orbits 16704 through 17310): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2022 JUL 01 00:01:09.184 2022 OCT 01 01:01:09.182 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the MAVEN NAV team during the orbital 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 MAVEN project data base by the MAVEN 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 DE430 planetary ephemeris and MAR097 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: trj_orb_16685-16733_rec_v1.bsp trj_orb_16732-16775_rec_v1.bsp trj_orb_16774-16825_rec_v1.bsp trj_orb_16824-16868_rec_v1.bsp trj_orb_16867-16917_rec_v1.bsp trj_orb_16916-16960_rec_v1.bsp trj_orb_16959-17007_rec_v1.bsp trj_orb_17006-17056_rec_v1.bsp trj_orb_17055-17095_rec_v1.bsp trj_orb_17094-17142_rec_v1.bsp trj_orb_17141-17194_rec_v1.bsp trj_orb_17193-17239_rec_v1.bsp trj_orb_17238-17290_rec_v1.bsp trj_orb_17289-17334_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 ./maven_orb_rec_220701_221001_v1.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 16711 2022-07-02T06:15:50.815 -0.001 -0.000 0.004 16721 2022-07-03T16:48:50.815 0.001 -0.000 0.000 16732 2022-07-05T09:32:50.816 -0.000 -0.000 0.001 16746 2022-07-07T11:52:50.816 -0.001 -0.000 0.002 16759 2022-07-09T09:23:50.816 -0.000 -0.000 -0.001 16764 2022-07-10T03:13:50.816 -0.000 0.000 -0.001 16774 2022-07-11T15:58:50.816 -0.002 0.001 -0.001 16786 2022-07-13T11:38:50.816 0.000 -0.000 -0.001 16800 2022-07-15T13:58:50.816 0.000 -0.000 -0.004 16811 2022-07-17T05:03:50.816 0.001 -0.000 -0.021 16819 2022-07-18T09:43:50.816 -0.003 0.001 0.045 16824 2022-07-19T03:38:50.816 -0.003 0.001 0.039 16830 2022-07-20T01:27:50.816 0.001 -0.001 -0.009 16839 2022-07-21T10:53:50.816 0.001 -0.000 0.001 16847 2022-07-22T14:43:50.816 0.002 -0.001 -0.007 16857 2022-07-24T02:28:50.816 0.000 -0.000 -0.000 16867 2022-07-25T15:28:50.816 -0.002 0.000 0.000 16883 2022-07-28T01:18:50.816 0.003 -0.001 0.000 16898 2022-07-30T07:18:50.816 -0.003 0.001 0.001 16908 2022-07-31T18:58:50.816 0.000 -0.000 -0.000 16916 2022-08-02T00:58:50.816 0.002 0.000 0.002 16923 2022-08-03T00:56:50.816 -0.002 0.001 0.004 16940 2022-08-05T13:44:50.816 0.002 -0.001 -0.003 16952 2022-08-07T11:28:50.816 0.001 0.000 0.001 16959 2022-08-08T11:56:50.816 0.001 0.000 0.000 16966 2022-08-09T14:26:50.816 0.002 0.001 0.003 16971 2022-08-10T05:49:50.816 0.005 -0.002 -0.008 16980 2022-08-11T16:33:50.816 0.000 0.000 0.000 16997 2022-08-14T05:18:50.817 -0.001 0.001 0.002 17006 2022-08-15T14:33:50.817 0.000 -0.000 -0.000 17017 2022-08-17T06:23:50.817 0.004 -0.002 -0.004 17025 2022-08-18T12:08:50.817 -0.004 0.001 0.004 17036 2022-08-20T05:08:50.817 -0.001 0.000 0.001 17044 2022-08-21T09:58:50.817 -0.004 0.001 0.003 17055 2022-08-23T01:25:50.817 0.009 -0.003 -0.005 17064 2022-08-24T10:24:50.817 -0.000 0.000 0.000 17075 2022-08-26T03:50:50.817 0.001 -0.000 -0.000 17082 2022-08-27T04:33:50.817 0.001 -0.000 -0.000 17094 2022-08-29T00:28:50.817 0.016 -0.006 -0.008 17108 2022-08-31T03:43:50.817 -0.004 0.001 0.001 17118 2022-09-01T18:03:50.817 0.007 0.001 -0.002 17129 2022-09-03T09:45:50.817 0.005 -0.001 -0.002 17141 2022-09-05T05:58:50.817 0.001 0.000 -0.000 17154 2022-09-07T04:58:50.817 0.000 -0.000 -0.000 17163 2022-09-08T14:28:50.817 -0.009 0.001 0.003 17174 2022-09-10T05:28:50.817 -0.002 0.001 -0.000 17189 2022-09-12T13:28:50.817 0.016 -0.003 -0.005 17193 2022-09-13T03:03:50.817 0.008 -0.003 0.001 17206 2022-09-15T04:03:50.817 -0.001 0.000 0.000 17212 2022-09-16T00:58:50.817 -0.001 0.000 -0.000 17226 2022-09-18T04:50:50.817 0.008 -0.002 -0.001 17231 2022-09-18T23:44:50.817 -0.015 -0.000 0.004 17238 2022-09-19T23:58:50.817 0.009 -0.003 0.002 17245 2022-09-21T01:58:50.817 -0.013 0.005 -0.002 17251 2022-09-21T23:14:50.817 -0.000 0.000 -0.000 17257 2022-09-22T23:15:50.817 -0.007 -0.001 0.002 17267 2022-09-24T10:58:50.817 0.037 -0.011 0.001 17281 2022-09-26T13:58:50.817 0.015 -0.006 0.003 17289 2022-09-27T18:53:50.817 0.020 -0.008 0.009 17304 2022-09-30T01:33:50.817 0.000 -0.000 0.000 End of comments.