MAVEN Reconstructed SPK, NAV Solution, 2015-07-01 to 2015-10-01, Version 1 =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Nov 9 07:40:18 PST 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 1463 through 1953): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2015 JUL 01 00:01:08.184 2015 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_01454-01500_rec_v1.bsp trj_orb_01500-01505_rec_v1.bsp trj_orb_01505-01509_rec_v1.bsp trj_orb_01509-01516_rec_v1.bsp trj_orb_01515-01519_rec_v1.bsp trj_orb_01519-01525_rec_v1.bsp trj_orb_01525-01537_rec_v1.bsp trj_orb_01536-01551_rec_v1.bsp trj_orb_01550-01609_rec_v1.bsp trj_orb_01609-01646_rec_v1.bsp trj_orb_01645-01685_rec_v1.bsp trj_orb_01684-01720_rec_v1.bsp trj_orb_01719-01743_rec_v1.bsp trj_orb_01742-01756_rec_v1.bsp trj_orb_01755-01800_rec_v1.bsp trj_orb_01800-01804_rec_v1.bsp trj_orb_01804-01811_rec_v1.bsp trj_orb_01811-01816_rec_v1.bsp trj_orb_01816-01822_rec_v1.bsp trj_orb_01822-01827_rec_v1.bsp trj_orb_01826-01831_rec_v1.bsp trj_orb_01831-01836_rec_v1.bsp trj_orb_01836-01841_rec_v1.bsp trj_orb_01840-01873_rec_v1.bsp trj_orb_01872-01910_rec_v1.bsp trj_orb_01909-01942_rec_v1.bsp trj_orb_01942-01983_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_150701_151001_v1.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 1464 2015-07-01T11:58:51.815 -0.418 -0.186 0.175 1466 2015-07-01T19:58:51.815 0.319 0.019 -0.095 1470 2015-07-02T14:28:51.815 0.146 0.061 -0.058 1477 2015-07-03T20:58:51.815 0.016 0.003 -0.005 1485 2015-07-05T07:58:51.815 0.053 -0.003 -0.008 1488 2015-07-05T21:28:51.816 -0.033 -0.001 0.006 1493 2015-07-06T19:58:51.816 -0.041 -0.006 0.009 1499 2015-07-07T22:28:51.816 0.517 0.054 -0.084 1500 2015-07-08T02:58:51.816 0.837 0.124 -0.157 1503 2015-07-08T14:18:51.816 0.127 -0.062 0.055 1505 2015-07-08T22:58:51.816 -0.059 0.026 -0.029 1506 2015-07-09T03:28:51.816 0.093 -0.042 0.048 1509 2015-07-09T16:58:51.816 -0.179 0.097 -0.078 1511 2015-07-10T02:58:51.816 -0.299 0.045 -0.008 1513 2015-07-10T11:58:51.816 -0.001 -0.002 0.000 1515 2015-07-10T21:58:51.816 -0.193 -0.091 0.068 1516 2015-07-11T02:28:51.816 0.281 0.127 -0.108 1519 2015-07-11T14:28:51.816 -0.097 0.000 0.003 1521 2015-07-12T00:28:51.816 -0.287 -0.139 0.113 1525 2015-07-12T15:58:51.816 0.320 -0.126 0.087 1527 2015-07-13T01:28:51.816 0.304 -0.016 0.016 1530 2015-07-13T14:28:51.816 0.104 -0.010 0.012 1534 2015-07-14T06:28:51.816 0.170 -0.074 0.090 1536 2015-07-14T15:58:51.816 0.087 -0.037 0.033 1538 2015-07-15T02:08:51.816 0.262 0.062 -0.018 1542 2015-07-15T18:13:51.816 -0.074 0.030 -0.029 1546 2015-07-16T10:58:51.816 0.045 -0.023 0.028 1550 2015-07-17T05:48:51.816 -0.089 0.010 -0.020 1557 2015-07-18T13:58:51.816 0.058 0.030 -0.024 1562 2015-07-19T11:58:51.816 -0.041 -0.021 0.021 1568 2015-07-20T13:58:51.816 0.118 0.058 -0.044 1574 2015-07-21T14:58:51.816 -0.072 -0.003 -0.018 1579 2015-07-22T12:28:51.816 0.103 -0.013 0.042 1581 2015-07-22T22:28:51.816 -0.091 -0.040 0.013 1586 2015-07-23T18:13:51.816 0.056 -0.026 0.042 1591 2015-07-24T17:58:51.816 -0.094 -0.036 -0.002 1595 2015-07-25T10:28:51.816 0.079 -0.006 0.038 1600 2015-07-26T06:58:51.816 0.025 -0.013 0.022 1603 2015-07-26T19:58:51.816 -0.018 0.009 -0.015 1609 2015-07-27T21:58:51.816 0.122 -0.050 0.070 1614 2015-07-28T19:58:51.816 0.008 -0.003 0.006 1621 2015-07-30T02:28:51.816 -0.064 0.030 -0.047 1630 2015-07-31T20:28:51.816 0.014 0.006 0.002 1633 2015-08-01T09:58:51.816 0.031 0.016 -0.010 1638 2015-08-02T07:28:51.816 -0.045 -0.020 -0.004 1645 2015-08-03T13:33:51.816 -0.078 -0.022 -0.043 1651 2015-08-04T13:58:51.816 0.097 -0.048 0.121 1658 2015-08-05T22:28:51.816 -0.093 -0.032 -0.052 1663 2015-08-06T18:13:51.816 -0.003 0.001 -0.004 1669 2015-08-07T19:58:51.816 0.029 -0.012 0.015 1673 2015-08-08T13:58:51.816 0.001 -0.001 0.002 1680 2015-08-09T20:28:51.816 0.001 0.001 0.000 1684 2015-08-10T16:28:51.816 -0.007 -0.004 -0.003 1690 2015-08-11T15:58:51.816 0.028 -0.015 0.038 1695 2015-08-12T13:43:51.816 -0.066 0.032 -0.081 1700 2015-08-13T15:28:51.817 0.094 0.047 0.062 1706 2015-08-14T16:58:51.817 -0.081 0.038 -0.153 1710 2015-08-15T11:58:51.817 0.059 -0.018 0.114 1714 2015-08-16T05:58:51.817 -0.017 0.010 -0.037 1719 2015-08-17T05:38:51.817 0.015 -0.004 0.031 1726 2015-08-18T13:58:51.817 0.129 -0.043 0.291 1729 2015-08-19T05:28:51.817 -0.125 -0.051 -0.193 1732 2015-08-19T17:58:51.817 -0.032 0.007 -0.075 1735 2015-08-20T07:28:51.817 0.015 -0.006 0.038 1742 2015-08-21T16:03:51.817 -0.043 0.014 -0.115 1746 2015-08-22T09:58:51.817 -0.011 0.006 -0.026 1753 2015-08-23T18:08:51.817 0.042 -0.022 0.087 1755 2015-08-24T05:13:51.817 -0.020 -0.003 -0.057 1762 2015-08-25T13:13:51.817 0.073 -0.004 0.240 1766 2015-08-26T06:58:51.817 -0.022 0.008 -0.077 1772 2015-08-27T12:53:51.817 0.005 0.002 0.011 1779 2015-08-28T18:58:51.817 -0.009 0.004 -0.040 1782 2015-08-29T09:13:51.817 0.037 -0.012 0.176 1786 2015-08-30T05:13:51.817 -0.075 -0.029 -0.322 1790 2015-08-30T21:43:51.817 0.052 -0.025 0.260 1794 2015-08-31T15:38:51.817 0.001 -0.001 0.003 1800 2015-09-01T19:18:51.817 -0.022 0.010 -0.018 1801 2015-09-02T02:13:51.817 -0.029 -0.006 -0.209 1804 2015-09-02T14:13:51.817 0.013 -0.007 0.074 1806 2015-09-03T01:28:51.817 0.014 0.006 0.098 1808 2015-09-03T09:58:51.817 -0.029 0.001 -0.259 1811 2015-09-03T22:28:51.817 -0.019 0.010 -0.140 1813 2015-09-04T07:38:51.817 0.019 -0.010 0.151 1816 2015-09-04T21:38:51.817 0.035 -0.018 0.384 1818 2015-09-05T06:58:51.817 -0.018 0.008 -0.238 1820 2015-09-05T15:58:51.817 -0.011 0.005 -0.146 1822 2015-09-06T00:58:51.817 -0.005 0.003 -0.076 1825 2015-09-06T14:58:51.817 0.004 -0.001 0.066 1826 2015-09-06T20:58:51.817 -0.005 -0.000 -0.116 1828 2015-09-07T05:08:51.817 0.005 -0.002 0.200 1831 2015-09-07T17:58:51.817 0.002 -0.001 0.080 1832 2015-09-07T22:38:51.817 0.001 -0.000 0.036 1833 2015-09-08T04:58:51.817 -0.003 -0.000 -0.297 1836 2015-09-08T17:28:51.817 0.000 -0.000 -0.051 1838 2015-09-09T03:28:51.817 0.008 -0.000 -0.726 1840 2015-09-09T13:28:51.817 0.005 0.002 -0.207 1842 2015-09-09T22:28:51.817 -0.011 -0.003 0.382 1843 2015-09-10T02:28:51.817 0.002 -0.004 -0.122 1846 2015-09-10T15:18:51.817 0.007 -0.000 -0.132 1853 2015-09-11T22:33:51.817 0.009 -0.005 -0.095 1860 2015-09-13T06:28:51.817 -0.028 0.014 0.203 1863 2015-09-13T21:58:51.817 0.008 0.002 -0.068 1867 2015-09-14T14:18:51.817 -0.003 0.003 0.021 1872 2015-09-15T13:58:51.817 -0.002 -0.000 0.009 1875 2015-09-16T05:13:51.817 -0.024 -0.012 0.135 1879 2015-09-16T21:58:51.817 0.037 -0.004 -0.197 1882 2015-09-17T12:58:51.817 -0.035 -0.016 0.180 1888 2015-09-18T15:58:51.817 0.006 0.002 -0.027 1893 2015-09-19T14:28:51.817 0.034 0.008 -0.143 1897 2015-09-20T08:58:51.817 -0.044 -0.014 0.178 1904 2015-09-21T16:58:51.817 0.005 0.002 -0.020 1909 2015-09-22T13:58:51.817 0.001 -0.000 -0.002 1912 2015-09-23T04:48:51.817 0.012 0.001 -0.039 1916 2015-09-23T22:13:51.817 -0.016 0.005 0.040 1920 2015-09-24T16:58:51.817 -0.004 0.000 0.011 1926 2015-09-25T21:18:51.817 0.035 0.015 -0.097 1930 2015-09-26T13:18:51.817 -0.043 0.023 0.046 1933 2015-09-27T04:38:51.817 0.033 0.006 -0.080 1942 2015-09-28T19:58:51.817 0.001 -0.001 -0.001 1947 2015-09-29T18:43:51.817 0.007 -0.003 -0.006 1953 2015-09-30T22:58:51.817 0.010 -0.001 -0.017 End of comments.