MAVEN Reconstructed SPK, NAV Solution, 2016-07-01 to 2016-10-01, Version 1 =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Nov 14 09:11:46 PST 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 3415 through 3905): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 JUL 01 00:01:08.184 2016 OCT 01 01:01:08.182 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_03402-03432_rec_v1.bsp trj_orb_03431-03477_rec_v1.bsp trj_orb_03476-03517_rec_v1.bsp trj_orb_03516-03549_rec_v1.bsp trj_orb_03549-03556_rec_v1.bsp trj_orb_03556-03561_rec_v1.bsp trj_orb_03561-03566_rec_v1.bsp trj_orb_03565-03571_rec_v1.bsp trj_orb_03571-03576_rec_v1.bsp trj_orb_03575-03582_rec_v1.bsp trj_orb_03582-03589_rec_v1.bsp trj_orb_03588-03593_rec_v1.bsp trj_orb_03592-03632_rec_v1.bsp trj_orb_03631-03670_rec_v1.bsp trj_orb_03669-03707_rec_v1.bsp trj_orb_03693-03743_rec_v1.bsp trj_orb_03742-03779_rec_v1.bsp trj_orb_03778-03816_rec_v1.bsp trj_orb_03815-03852_rec_v1.bsp trj_orb_03851-03888_rec_v1.bsp trj_orb_03887-03924_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_160701_161001_v1.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 3418 2016-07-01T18:58:51.815 -0.026 -0.002 0.019 3421 2016-07-02T08:58:51.815 0.008 0.003 -0.006 3426 2016-07-03T05:58:51.815 0.048 -0.003 -0.034 3431 2016-07-04T03:28:51.815 0.092 -0.031 -0.054 3440 2016-07-05T20:13:51.816 -0.044 -0.005 0.035 3444 2016-07-06T12:58:51.816 0.035 -0.011 -0.021 3451 2016-07-07T20:58:51.816 -0.075 -0.016 0.062 3457 2016-07-08T21:58:51.816 0.077 -0.035 -0.027 3463 2016-07-10T00:58:51.816 0.016 -0.004 -0.009 3468 2016-07-11T00:13:21.816 -0.030 -0.009 0.027 3476 2016-07-12T09:58:51.816 0.039 -0.018 -0.014 3481 2016-07-13T07:13:51.816 0.038 -0.016 0.025 3486 2016-07-14T08:28:51.816 -0.006 -0.004 0.006 3494 2016-07-15T17:28:51.816 -0.003 0.001 0.001 3497 2016-07-16T06:58:51.816 0.081 -0.027 -0.035 3502 2016-07-17T06:28:51.816 -0.033 -0.010 0.033 3506 2016-07-17T23:58:51.816 0.057 0.015 -0.053 3510 2016-07-18T16:43:51.816 -0.125 0.023 0.070 3516 2016-07-19T17:58:51.816 0.000 0.000 0.000 3523 2016-07-21T01:58:51.816 -0.033 0.009 0.013 3532 2016-07-22T17:58:51.816 -0.056 0.009 0.029 3535 2016-07-23T06:43:51.816 -0.017 0.006 0.003 3542 2016-07-24T12:58:51.816 0.032 -0.016 0.022 3549 2016-07-25T20:48:51.816 -0.275 0.081 0.071 3551 2016-07-26T04:58:51.816 -0.134 0.067 -0.057 3554 2016-07-26T17:43:51.816 0.287 -0.129 0.322 3556 2016-07-27T02:58:51.816 0.159 -0.080 0.077 3559 2016-07-27T16:13:51.816 -0.149 0.075 -0.067 3561 2016-07-28T01:28:51.816 -0.192 0.068 0.015 3565 2016-07-28T19:58:51.816 0.108 0.012 -0.081 3569 2016-07-29T11:58:51.816 -0.177 0.088 -0.107 3571 2016-07-29T20:19:41.816 -0.011 0.005 -0.013 3573 2016-07-30T04:59:41.816 -0.048 0.022 -0.060 3575 2016-07-30T15:48:51.816 -0.089 -0.017 0.081 3579 2016-07-31T06:58:51.816 -0.025 0.010 -0.034 3582 2016-07-31T20:38:51.816 -0.254 0.119 -0.143 3584 2016-08-01T06:58:51.816 0.106 0.026 -0.101 3588 2016-08-01T23:58:51.816 -0.169 -0.011 0.110 3592 2016-08-02T16:13:51.816 -0.024 0.010 -0.011 3596 2016-08-03T08:58:51.816 0.005 -0.002 0.007 3601 2016-08-04T06:43:51.816 -0.012 0.006 -0.017 3609 2016-08-05T17:18:51.816 -0.007 0.003 -0.013 3617 2016-08-07T04:43:51.816 0.022 -0.010 0.020 3625 2016-08-08T15:58:51.816 0.002 -0.001 0.000 3631 2016-08-09T16:48:51.816 -0.018 0.006 -0.034 3639 2016-08-11T06:18:51.816 0.001 0.001 -0.002 3647 2016-08-12T15:53:51.817 0.010 -0.002 0.001 3655 2016-08-14T04:26:21.817 0.001 0.001 -0.003 3661 2016-08-15T06:03:51.817 -0.004 -0.002 0.007 3669 2016-08-16T15:58:51.817 0.001 -0.000 -0.000 3673 2016-08-17T08:58:51.817 -0.009 0.001 -0.004 3675 2016-08-17T16:28:51.817 -0.000 0.000 -0.001 3685 2016-08-19T16:58:51.817 0.002 0.001 -0.002 3693 2016-08-21T05:58:51.817 -0.003 -0.001 0.003 3701 2016-08-22T16:33:51.817 0.000 0.000 -0.000 3706 2016-08-23T16:58:51.817 0.009 -0.002 0.012 3709 2016-08-24T06:58:51.817 -0.009 0.001 -0.012 3713 2016-08-25T00:58:51.817 -0.001 0.000 -0.002 3716 2016-08-25T15:38:51.817 -0.004 0.000 -0.003 3721 2016-08-26T15:34:51.817 0.007 0.002 -0.008 3729 2016-08-28T02:58:51.817 -0.002 0.001 -0.007 3735 2016-08-29T06:28:51.817 0.002 -0.001 0.010 3742 2016-08-30T15:38:51.817 -0.005 0.001 -0.013 3745 2016-08-31T04:58:51.817 0.005 -0.002 0.025 3750 2016-09-01T04:03:51.817 -0.002 0.001 -0.010 3758 2016-09-02T16:28:51.817 -0.009 0.004 -0.080 3761 2016-09-03T06:58:51.817 0.015 -0.005 0.112 3771 2016-09-05T05:13:51.817 -0.003 0.001 -0.034 3778 2016-09-06T15:28:51.817 0.001 0.001 -0.011 3786 2016-09-08T02:28:51.817 -0.001 0.000 -0.037 3793 2016-09-09T10:28:51.817 0.001 -0.000 -0.062 3796 2016-09-09T23:58:51.817 -0.004 0.002 0.212 3802 2016-09-11T03:34:55.817 0.004 -0.002 -0.111 3809 2016-09-12T15:15:05.817 0.000 0.000 0.000 3815 2016-09-13T17:58:51.817 -0.005 -0.001 0.023 3823 2016-09-15T06:58:51.817 -0.014 -0.003 0.044 3827 2016-09-16T00:58:51.817 0.017 -0.000 -0.086 3834 2016-09-17T07:58:51.817 -0.000 0.000 0.003 3839 2016-09-18T07:58:51.817 0.003 -0.001 -0.014 3843 2016-09-19T02:58:51.817 0.000 -0.000 -0.001 3846 2016-09-19T15:28:51.817 -0.002 0.001 0.009 3851 2016-09-20T15:18:51.817 0.013 -0.004 -0.061 3859 2016-09-22T05:18:51.817 -0.009 -0.001 0.025 3868 2016-09-23T22:31:51.817 0.002 -0.000 -0.005 3873 2016-09-24T22:28:51.817 -0.012 -0.004 0.021 3882 2016-09-26T15:13:51.817 -0.001 -0.000 0.002 3887 2016-09-27T14:58:51.817 0.005 0.001 -0.010 3894 2016-09-28T22:33:51.817 -0.007 0.001 0.016 3898 2016-09-29T16:38:51.817 -0.006 0.002 0.015 3904 2016-09-30T22:10:51.817 -0.016 -0.007 0.017 End of comments.