MAVEN Reconstructed SPK, NAV Solution, 2014-09-22 to 2015-01-01, Version 1 =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed May 20 10:08:37 PDT 2015 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 2 through 497): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2014 SEP 22 02:45:00.000 2015 JAN 01 01:01:07.183 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_00001-00083_rec_v1.bsp trj_orb_00082-00120_rec_v1.bsp trj_orb_00119-00183_rec_v1.bsp trj_orb_00182-00234_rec_v1.bsp trj_orb_00233-00252_rec_v1.bsp trj_orb_00251-00260_rec_v1.bsp trj_orb_00259-00340_rec_v1.bsp trj_orb_00339-00360_rec_v1.bsp trj_orb_00360-00380_rec_v1.bsp trj_orb_00379-00415_rec_v1.bsp trj_orb_00414-00446_rec_v1.bsp trj_orb_00445-00483_rec_v1.bsp trj_orb_00482-00523_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_140922_150101_v1.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 2 2014-09-24T21:18:52.817 0.018 0.023 0.017 3 2014-09-26T08:28:52.817 0.020 0.029 0.014 4 2014-09-27T09:58:52.817 0.688 0.619 0.558 5 2014-09-28T00:58:52.817 0.334 0.112 0.180 8 2014-09-28T19:18:52.817 -0.006 -0.001 0.004 11 2014-09-29T08:58:52.817 -0.028 -0.000 -0.018 15 2014-09-30T05:58:52.817 0.056 -0.022 0.038 19 2014-10-01T06:28:52.817 0.079 0.048 0.015 23 2014-10-02T04:28:52.817 -0.074 -0.043 -0.003 26 2014-10-02T16:13:52.817 0.173 -0.043 -0.062 27 2014-10-03T01:18:52.817 0.295 0.155 0.055 31 2014-10-03T18:38:52.817 0.071 0.011 0.037 35 2014-10-04T11:59:59.817 -0.156 0.059 -0.082 39 2014-10-05T07:59:59.817 0.100 0.031 0.047 43 2014-10-05T23:59:59.817 0.062 -0.028 0.001 46 2014-10-06T16:59:10.817 -0.066 -0.034 -0.022 50 2014-10-07T11:27:27.817 -0.031 -0.015 -0.010 54 2014-10-08T05:55:38.817 0.045 0.023 0.015 58 2014-10-08T23:58:52.817 -0.028 -0.010 -0.012 61 2014-10-09T11:58:52.817 -0.035 0.014 -0.012 64 2014-10-10T01:58:52.817 0.038 -0.014 0.013 68 2014-10-10T23:21:47.817 0.009 0.002 -0.002 74 2014-10-12T02:49:47.817 0.014 0.006 0.001 78 2014-10-12T19:28:47.817 0.009 0.000 0.003 82 2014-10-13T13:06:07.817 -0.034 0.012 -0.008 88 2014-10-14T19:22:47.817 0.016 0.007 0.003 93 2014-10-15T18:58:52.817 -0.018 -0.001 0.005 98 2014-10-16T17:58:52.817 0.020 0.003 -0.003 105 2014-10-18T01:28:52.817 0.059 0.030 0.020 110 2014-10-18T23:58:52.817 0.042 0.015 0.012 115 2014-10-19T22:58:52.817 -0.005 -0.001 -0.001 119 2014-10-20T17:59:59.817 -0.072 -0.037 -0.023 126 2014-10-21T23:59:59.817 0.037 -0.016 -0.002 131 2014-10-22T23:59:59.817 -0.023 0.002 -0.002 136 2014-10-24T00:43:52.817 -0.059 -0.012 -0.010 145 2014-10-25T17:59:30.817 -0.050 -0.026 -0.015 151 2014-10-26T21:38:03.817 0.032 0.017 0.009 156 2014-10-27T19:28:52.817 -0.008 -0.001 -0.000 161 2014-10-28T18:58:52.817 0.057 0.018 0.005 166 2014-10-29T18:13:52.817 0.113 0.040 0.010 171 2014-10-30T17:58:52.817 -0.103 -0.056 -0.032 177 2014-10-31T18:58:52.817 0.005 -0.002 -0.002 182 2014-11-01T20:07:12.817 -0.038 -0.016 -0.003 187 2014-11-02T16:47:42.817 -0.010 0.007 0.005 192 2014-11-03T17:48:52.817 -0.000 0.007 -0.002 197 2014-11-04T17:58:52.817 -0.021 -0.011 -0.009 203 2014-11-05T18:58:52.817 -0.126 0.049 0.058 208 2014-11-06T18:58:52.817 -0.132 -0.005 0.037 209 2014-11-07T00:58:52.817 0.312 0.166 0.072 214 2014-11-07T23:58:52.817 -0.052 -0.028 -0.010 218 2014-11-08T17:58:52.817 -0.084 -0.037 0.003 223 2014-11-09T16:59:59.817 0.115 0.055 -0.010 228 2014-11-10T15:59:59.817 0.297 0.135 -0.036 233 2014-11-11T13:33:52.817 -0.314 0.061 0.175 238 2014-11-12T11:58:52.817 0.112 -0.046 -0.078 243 2014-11-13T11:58:52.817 0.030 0.002 -0.017 248 2014-11-14T11:58:52.817 -0.075 -0.032 0.022 251 2014-11-15T00:13:52.817 -0.039 0.011 0.028 252 2014-11-15T05:59:59.817 -0.114 -0.031 0.053 259 2014-11-16T14:59:59.817 -0.114 -0.059 0.014 268 2014-11-18T07:59:59.817 0.189 0.077 -0.087 271 2014-11-18T21:18:52.817 -0.182 -0.035 0.120 276 2014-11-19T21:58:52.817 -0.269 -0.062 -0.225 281 2014-11-20T19:13:52.817 0.100 0.020 -0.076 287 2014-11-21T23:58:52.817 0.118 0.062 0.001 293 2014-11-23T02:28:52.817 -0.061 -0.017 0.052 299 2014-11-24T07:17:47.817 0.036 0.017 0.013 303 2014-11-25T01:03:52.817 -0.002 -0.002 0.002 308 2014-11-25T22:28:52.817 0.090 -0.015 -0.104 314 2014-11-27T02:58:52.817 0.088 0.027 -0.093 316 2014-11-27T11:58:52.817 -0.010 -0.003 0.012 318 2014-11-27T22:28:52.816 0.047 0.023 0.009 323 2014-11-28T21:28:52.816 -0.088 -0.040 -0.024 329 2014-11-29T22:43:52.816 0.034 -0.008 -0.046 332 2014-11-30T11:58:52.816 -0.013 0.009 0.019 336 2014-12-01T08:43:52.816 0.114 0.061 -0.087 339 2014-12-01T20:59:59.816 -0.028 0.002 0.043 344 2014-12-02T18:59:59.816 0.012 -0.006 -0.018 349 2014-12-03T18:59:59.816 0.051 0.001 -0.084 354 2014-12-04T19:14:59.816 0.061 0.027 -0.065 360 2014-12-05T19:58:52.816 0.127 -0.068 -0.125 366 2014-12-07T00:58:52.816 0.301 -0.000 -0.586 373 2014-12-08T07:28:52.816 0.008 -0.005 -0.005 379 2014-12-09T11:58:52.816 -0.001 0.002 0.004 385 2014-12-10T16:43:52.816 -0.043 -0.014 0.105 388 2014-12-11T07:13:52.816 0.047 0.025 -0.084 391 2014-12-11T19:03:52.816 -0.148 0.033 0.361 397 2014-12-12T21:58:52.816 0.071 -0.033 -0.148 403 2014-12-14T02:59:59.816 -0.046 -0.011 0.145 405 2014-12-14T11:19:59.816 0.060 -0.010 -0.176 409 2014-12-15T06:59:59.816 0.020 0.008 -0.065 414 2014-12-16T04:18:52.816 -0.014 0.004 0.043 418 2014-12-16T22:03:52.816 -0.002 0.001 0.003 424 2014-12-18T02:53:52.816 -0.039 -0.003 0.163 429 2014-12-19T02:18:52.816 0.015 0.004 -0.069 434 2014-12-20T00:58:52.816 0.041 0.008 -0.217 439 2014-12-21T01:18:52.816 -0.011 -0.004 0.018 445 2014-12-22T01:38:52.816 -0.014 0.008 0.036 450 2014-12-23T02:53:52.816 -0.030 -0.013 0.258 454 2014-12-23T20:23:52.816 0.046 0.005 -0.427 459 2014-12-24T19:08:52.816 -0.029 -0.001 0.321 465 2014-12-25T23:08:52.816 0.018 0.005 -0.322 471 2014-12-27T01:58:52.816 -0.011 0.000 0.307 476 2014-12-28T01:58:52.816 0.001 0.001 -0.151 482 2014-12-29T03:58:52.816 -0.000 0.000 -0.047 491 2014-12-30T21:58:52.816 -0.019 -0.003 -0.363 495 2014-12-31T16:58:52.816 0.002 0.001 0.032 End of comments.