MAVEN Reconstructed SPK, NAV Solution, 2016-04-01 to 2016-07-01, Version 1 =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Aug 11 14:05:28 PDT 2016 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 2926 through 3414): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 APR 01 00:01:08.185 2016 JUL 01 01:01:08.184 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_02913-02950_rec_v1.bsp trj_orb_02949-02988_rec_v1.bsp trj_orb_02987-03026_rec_v1.bsp trj_orb_03025-03056_rec_v1.bsp trj_orb_03056-03101_rec_v1.bsp trj_orb_03100-03137_rec_v1.bsp trj_orb_03136-03175_rec_v1.bsp trj_orb_03174-03207_rec_v1.bsp trj_orb_03206-03249_rec_v1.bsp trj_orb_03248-03283_rec_v1.bsp trj_orb_03283-03288_rec_v1.bsp trj_orb_03288-03294_rec_v1.bsp trj_orb_03293-03300_rec_v1.bsp trj_orb_03300-03306_rec_v1.bsp trj_orb_03306-03311_rec_v1.bsp trj_orb_03311-03316_rec_v1.bsp trj_orb_03316-03321_rec_v1.bsp trj_orb_03320-03327_rec_v1.bsp trj_orb_03326-03332_rec_v1.bsp trj_orb_03331-03365_rec_v1.bsp trj_orb_03364-03403_rec_v1.bsp trj_orb_03402-03432_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_160401_160701_v1.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 2928 2016-04-01T11:58:51.814 -0.009 0.003 0.007 2934 2016-04-02T15:28:51.814 -0.019 0.010 0.002 2936 2016-04-03T00:33:51.814 -0.089 0.046 0.001 2941 2016-04-04T00:28:51.814 0.109 0.008 0.065 2945 2016-04-04T16:58:51.814 0.069 -0.035 -0.001 2949 2016-04-05T12:28:51.814 0.024 0.003 0.014 2952 2016-04-06T02:28:51.814 -0.029 -0.011 -0.020 2959 2016-04-07T09:58:51.814 0.085 0.036 0.059 2966 2016-04-08T16:58:51.814 -0.041 -0.010 -0.024 2970 2016-04-09T09:58:51.814 -0.095 0.019 -0.029 2974 2016-04-10T04:58:51.814 0.084 0.024 0.048 2981 2016-04-11T11:58:51.814 -0.001 -0.001 -0.000 2987 2016-04-12T12:53:51.814 -0.065 0.029 0.035 2991 2016-04-13T07:08:51.814 -0.002 0.001 0.001 2998 2016-04-14T13:58:51.814 0.035 -0.007 -0.019 3003 2016-04-15T13:58:51.814 -0.028 0.008 -0.004 3013 2016-04-17T11:18:51.814 0.066 -0.002 0.015 3019 2016-04-18T12:58:51.814 0.003 -0.002 -0.001 3025 2016-04-19T15:38:51.814 0.012 -0.006 -0.005 3032 2016-04-20T23:58:51.814 0.021 -0.007 -0.000 3040 2016-04-22T10:58:51.814 0.046 -0.024 -0.021 3051 2016-04-24T12:58:51.814 -0.056 0.024 0.010 3056 2016-04-25T11:13:51.814 0.026 -0.013 -0.007 3063 2016-04-26T18:28:51.814 -0.032 0.016 0.011 3070 2016-04-28T01:28:51.814 -0.002 0.001 0.001 3077 2016-04-29T09:58:51.814 0.013 -0.004 -0.002 3088 2016-05-01T10:43:51.814 0.054 -0.026 -0.020 3094 2016-05-02T14:58:51.814 0.016 0.001 0.000 3100 2016-05-03T17:58:51.814 -0.092 -0.010 -0.002 3107 2016-05-05T01:58:51.814 -0.025 -0.010 -0.004 3110 2016-05-05T15:48:51.814 0.084 0.042 0.026 3116 2016-05-06T18:28:51.814 0.054 0.023 0.011 3121 2016-05-07T14:58:51.814 -0.075 0.032 0.028 3124 2016-05-08T05:58:51.814 -0.041 -0.011 -0.002 3128 2016-05-08T22:28:51.814 -0.022 0.009 0.008 3131 2016-05-09T11:58:51.814 0.043 -0.017 -0.015 3136 2016-05-10T09:28:51.814 -0.002 0.002 0.002 3146 2016-05-12T06:08:51.814 -0.043 0.015 0.014 3147 2016-05-12T12:13:51.814 0.245 -0.041 -0.063 3155 2016-05-13T22:58:51.814 0.015 -0.007 -0.008 3163 2016-05-15T10:58:51.814 -0.151 0.078 0.079 3169 2016-05-16T13:43:51.814 0.102 -0.053 -0.054 3174 2016-05-17T12:43:51.814 0.001 0.000 0.000 3179 2016-05-18T11:58:51.814 -0.135 0.005 0.037 3185 2016-05-19T13:58:51.814 0.102 -0.045 -0.051 3190 2016-05-20T12:58:51.814 0.083 -0.016 -0.031 3195 2016-05-21T11:58:51.814 0.060 0.006 -0.015 3200 2016-05-22T09:28:51.814 0.082 -0.028 -0.038 3206 2016-05-23T12:58:51.814 0.198 -0.013 -0.069 3216 2016-05-25T08:13:51.814 -0.117 0.055 0.051 3218 2016-05-25T20:28:51.814 0.188 0.095 0.050 3221 2016-05-26T06:28:51.814 0.094 -0.037 -0.025 3230 2016-05-27T23:13:51.815 -0.220 0.113 0.118 3237 2016-05-29T07:28:51.815 0.132 -0.038 -0.068 3243 2016-05-30T11:23:51.815 -0.047 -0.010 0.015 3248 2016-05-31T10:10:51.815 0.010 0.004 -0.002 3257 2016-06-02T03:03:26.815 -0.110 -0.056 0.001 3267 2016-06-03T21:00:51.815 0.207 -0.106 -0.104 3272 2016-06-04T19:58:51.815 -0.072 0.031 0.044 3278 2016-06-05T22:18:51.815 -0.017 0.009 0.009 3283 2016-06-06T20:18:51.815 0.002 -0.001 -0.000 3285 2016-06-07T05:28:51.815 0.273 -0.131 -0.092 3288 2016-06-07T19:28:51.815 0.113 -0.055 -0.069 3289 2016-06-08T01:28:51.815 0.111 0.024 -0.049 3292 2016-06-08T12:58:51.815 0.231 -0.121 -0.117 3293 2016-06-08T19:08:51.815 1.067 0.130 -0.522 3295 2016-06-09T02:28:51.815 -0.102 0.052 0.057 3298 2016-06-09T15:28:51.815 0.079 -0.039 -0.026 3300 2016-06-10T00:28:51.815 0.477 -0.244 -0.205 3302 2016-06-10T08:58:51.815 0.004 -0.001 0.000 3304 2016-06-10T18:28:51.815 -0.423 0.218 0.240 3306 2016-06-11T03:58:51.815 -0.119 0.036 0.073 3309 2016-06-11T16:43:51.815 -0.124 0.060 0.073 3311 2016-06-12T01:28:51.815 0.212 -0.107 -0.120 3314 2016-06-12T14:28:51.815 -0.210 0.108 0.094 3316 2016-06-12T22:53:51.815 -0.114 0.041 -0.004 3317 2016-06-13T03:58:51.815 -0.091 0.045 0.053 3320 2016-06-13T18:48:51.815 0.080 0.015 -0.044 3322 2016-06-14T02:58:51.815 -0.132 0.016 0.080 3324 2016-06-14T11:58:51.815 0.048 -0.002 -0.028 3326 2016-06-14T18:58:51.815 -0.026 0.009 -0.002 3329 2016-06-15T10:13:51.815 0.026 0.002 -0.015 3331 2016-06-15T18:38:51.815 0.150 -0.024 -0.095 3334 2016-06-16T07:58:51.815 0.001 -0.001 -0.000 3342 2016-06-17T19:37:51.815 0.054 0.004 -0.034 3350 2016-06-19T06:02:51.815 -0.135 0.045 0.087 3355 2016-06-20T03:28:51.815 0.027 -0.014 -0.013 3364 2016-06-21T19:43:51.815 0.092 -0.033 -0.058 3371 2016-06-23T01:58:51.815 -0.065 0.034 0.025 3375 2016-06-23T20:33:51.815 0.075 -0.017 -0.050 3383 2016-06-25T09:13:51.815 -0.014 -0.006 0.009 3393 2016-06-27T02:58:51.815 0.001 -0.001 -0.000 3402 2016-06-28T18:58:51.815 -0.037 0.018 0.016 3405 2016-06-29T07:58:51.815 0.034 -0.017 -0.008 3409 2016-06-30T01:28:51.815 -0.002 0.001 0.000 3413 2016-06-30T19:28:51.815 -0.005 0.002 0.002 End of comments.