2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Nov 15 06:58:13 PST 2018 Objects in the Ephemeris -------------------------------------------------------- This SPK file contains ephemeris data for the 2001 Mars Odyssey (M01) spacecraft. The NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Extended Phase of the M01 mission (orbits 73389 through 74505): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2018 JUL 01 00:01:09.184 2018 OCT 01 01:01:09.182 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by the M01 NAV team during the Extended 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 M01 project data base by the M01 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 DE405 planetary ephemeris and MAR063 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: spk_m_od73354-73431_rec_v1.bsp spk_m_od73430-73528_rec_v1.bsp spk_m_od73527-73613_rec_v1.bsp spk_m_od73611-73698_rec_v1.bsp spk_m_od73697-73781_rec_v1.bsp spk_m_od73780-73854_rec_v1.bsp spk_m_od73853-73946_rec_v1.bsp spk_m_od73945-74031_rec_v1.bsp spk_m_od74027-74116_rec_v1.bsp spk_m_od74115-74205_rec_v1.bsp spk_m_od74204-74286_rec_v1.bsp spk_m_od74286-74380_rec_v1.bsp spk_m_od74379-74464_rec_v1.bsp spk_m_od74464-74548_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 ./m01_ext56.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 73395 2018-07-01T13:41:50.815 0.003 0.000 -0.001 73418 2018-07-03T11:00:50.815 -0.032 0.001 0.008 73430 2018-07-04T10:40:50.815 -0.039 0.001 0.008 73454 2018-07-06T10:11:50.816 0.029 0.000 -0.007 73467 2018-07-07T13:01:50.816 0.003 0.000 0.001 73485 2018-07-09T00:26:50.816 -0.045 0.000 -0.009 73496 2018-07-09T21:46:50.816 -0.022 0.000 0.004 73517 2018-07-11T14:30:50.816 -0.005 -0.001 0.000 73527 2018-07-12T09:50:50.816 0.011 0.000 0.004 73550 2018-07-14T07:28:50.816 -0.006 0.000 -0.002 73572 2018-07-16T04:30:50.816 -0.036 0.001 -0.007 73588 2018-07-17T11:03:50.816 0.056 -0.000 -0.006 73600 2018-07-18T11:39:50.816 -0.017 -0.000 0.001 73611 2018-07-19T08:10:50.816 0.018 -0.000 0.005 73637 2018-07-21T11:51:50.816 0.001 -0.000 -0.001 73649 2018-07-22T11:24:50.816 0.032 -0.001 0.007 73669 2018-07-24T03:51:50.816 -0.015 0.000 0.005 73685 2018-07-25T11:31:50.816 -0.007 0.000 0.002 73697 2018-07-26T10:15:50.816 -0.019 0.000 -0.006 73709 2018-07-27T11:16:50.816 0.018 0.001 0.000 73728 2018-07-28T23:23:50.816 -0.016 0.000 -0.007 73746 2018-07-30T11:06:50.816 -0.003 0.000 -0.001 73770 2018-08-01T10:49:50.816 0.005 -0.000 0.001 73780 2018-08-02T06:00:50.816 -0.027 -0.001 -0.011 73794 2018-08-03T10:41:50.816 -0.032 0.000 0.014 73811 2018-08-04T19:31:50.816 -0.028 -0.000 -0.014 73830 2018-08-06T10:21:50.816 0.027 0.000 -0.008 73842 2018-08-07T10:04:50.816 -0.026 0.000 0.008 73853 2018-08-08T06:40:50.816 0.001 0.000 0.001 73874 2018-08-10T01:15:50.816 0.011 0.000 -0.005 73895 2018-08-11T18:44:50.816 0.001 -0.000 -0.001 73915 2018-08-13T09:56:50.817 0.001 0.000 -0.001 73923 2018-08-14T01:56:50.817 -0.005 0.000 0.003 73945 2018-08-15T20:35:50.817 -0.000 -0.000 0.000 73966 2018-08-17T14:19:50.817 -0.004 0.000 -0.001 73980 2018-08-18T18:27:50.817 0.003 -0.000 -0.002 74000 2018-08-20T09:27:50.817 -0.001 -0.000 -0.000 74019 2018-08-21T23:48:50.817 0.002 0.000 -0.002 74027 2018-08-22T14:23:50.817 0.006 0.000 0.004 74048 2018-08-24T09:07:50.817 0.002 -0.000 -0.001 74060 2018-08-25T08:44:50.817 -0.003 0.000 0.002 74076 2018-08-26T15:45:50.817 0.001 -0.000 0.000 74103 2018-08-28T21:47:50.817 -0.017 0.000 0.015 74115 2018-08-29T20:45:50.817 0.014 -0.000 0.010 74125 2018-08-30T16:29:50.817 -0.003 0.000 -0.002 74149 2018-09-01T16:44:50.817 -0.001 -0.000 0.001 74169 2018-09-03T08:17:50.817 0.002 -0.000 -0.002 74189 2018-09-04T23:48:50.817 -0.001 -0.000 0.001 74204 2018-09-06T04:36:50.817 0.006 0.000 0.005 74217 2018-09-07T06:30:50.817 0.002 -0.000 0.001 74228 2018-09-08T04:54:50.817 0.002 0.000 -0.002 74249 2018-09-09T21:44:50.817 0.000 0.000 0.000 74265 2018-09-11T05:24:50.817 -0.003 -0.000 -0.002 74286 2018-09-12T22:27:50.817 -0.002 -0.000 -0.002 74297 2018-09-13T20:40:50.817 -0.001 -0.000 -0.001 74316 2018-09-15T10:23:50.817 -0.003 -0.000 0.000 74331 2018-09-16T16:29:50.817 0.001 -0.000 -0.001 74363 2018-09-19T07:45:50.817 0.002 -0.000 -0.002 74379 2018-09-20T14:41:50.817 -0.002 0.000 -0.002 74392 2018-09-21T16:32:50.817 -0.004 0.000 -0.001 74404 2018-09-22T16:27:50.817 -0.001 -0.000 0.001 74416 2018-09-23T16:25:50.817 0.001 0.000 -0.001 74428 2018-09-24T15:43:50.817 -0.002 0.000 -0.000 74452 2018-09-26T15:39:50.817 0.001 0.000 -0.001 74464 2018-09-27T14:20:50.817 -0.002 -0.000 -0.002 74476 2018-09-28T15:06:50.817 -0.003 0.000 0.004 74504 2018-09-30T22:27:50.817 -0.000 0.000 0.000