2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Nov 17 10:41:45 PST 2017 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 68959 through 70074): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2017 JUL 01 00:01:09.184 2017 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_od68941-69023_rec_v1.bsp spk_m_od69019-69105_rec_v1.bsp spk_m_od69104-69186_rec_v1.bsp spk_m_od69171-69246_rec_v1.bsp spk_m_od69232-69367_rec_v1.bsp spk_m_od69365-69449_rec_v1.bsp spk_m_od69446-69537_rec_v1.bsp spk_m_od69535-69601_rec_v1.bsp spk_m_od69600-69703_rec_v1.bsp spk_m_od69701-69789_rec_v1.bsp spk_m_od69788-69868_rec_v1.bsp spk_m_od69866-69957_rec_v1.bsp spk_m_od69956-70046_rec_v1.bsp spk_m_od70041-70122_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_ext52.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 68961 2017-07-01T05:58:50.815 -0.038 0.000 -0.001 68973 2017-07-02T06:01:50.815 0.029 -0.000 0.005 68983 2017-07-03T02:11:50.815 -0.006 0.001 -0.001 68994 2017-07-04T00:58:50.815 0.038 0.000 -0.006 69007 2017-07-05T01:50:50.816 0.016 -0.001 0.001 69019 2017-07-06T01:33:50.816 -0.042 0.000 -0.003 69038 2017-07-07T15:18:50.816 -0.036 0.000 0.002 69056 2017-07-09T02:47:50.816 0.043 -0.000 0.002 69070 2017-07-10T05:51:50.816 -0.019 0.000 -0.004 69084 2017-07-11T10:01:41.816 0.027 -0.000 0.004 69104 2017-07-13T01:50:50.816 -0.065 0.001 0.003 69125 2017-07-14T18:18:50.816 -0.063 -0.000 0.002 69143 2017-07-16T05:43:50.816 -0.008 -0.000 0.001 69155 2017-07-17T05:53:50.816 0.048 0.000 0.008 69171 2017-07-18T14:30:50.816 -0.019 0.001 0.003 69198 2017-07-20T19:36:50.816 0.032 -0.001 0.003 69221 2017-07-22T17:52:36.816 -0.005 -0.000 0.002 69232 2017-07-23T14:25:46.816 -0.021 0.000 -0.005 69314 2017-07-30T09:45:04.816 0.004 -0.000 -0.001 69339 2017-08-01T09:48:50.816 0.030 -0.000 0.006 69365 2017-08-03T13:34:17.816 0.013 -0.000 0.004 69383 2017-08-05T01:35:29.816 -0.037 -0.000 -0.000 69395 2017-08-06T01:35:19.816 -0.002 0.000 0.000 69408 2017-08-07T02:50:44.816 -0.023 -0.000 -0.004 69429 2017-08-08T19:43:50.816 -0.035 0.000 -0.005 69446 2017-08-10T06:31:50.816 0.052 0.000 -0.014 69469 2017-08-12T02:58:50.816 -0.043 0.000 -0.010 69485 2017-08-13T11:04:50.817 -0.052 0.001 -0.012 69500 2017-08-14T16:43:50.817 -0.008 0.000 -0.002 69516 2017-08-16T00:33:50.817 0.044 -0.000 0.003 69535 2017-08-17T14:06:50.817 0.026 0.000 0.003 69553 2017-08-19T00:48:50.817 0.003 0.000 -0.000 69565 2017-08-20T01:53:50.817 0.015 0.000 -0.005 69586 2017-08-21T17:48:50.817 -0.069 -0.001 0.018 69600 2017-08-22T22:08:50.817 0.040 0.000 0.013 69625 2017-08-24T23:38:25.817 -0.047 0.000 -0.016 69639 2017-08-26T03:15:42.817 -0.003 -0.000 -0.001 69651 2017-08-27T02:34:04.817 -0.030 -0.000 0.002 69670 2017-08-28T17:08:50.817 -0.004 -0.000 -0.000 69682 2017-08-29T16:33:50.817 0.023 -0.000 0.007 69701 2017-08-31T06:15:50.817 0.034 0.000 0.008 69718 2017-09-01T16:03:50.817 0.083 -0.000 0.004 69735 2017-09-03T01:33:50.817 -0.007 -0.000 -0.001 69755 2017-09-04T17:43:50.817 -0.017 -0.000 0.006 69771 2017-09-05T23:55:50.817 0.073 0.000 -0.000 69788 2017-09-07T10:09:29.817 -0.024 0.000 -0.008 69809 2017-09-09T03:55:34.817 -0.005 -0.000 -0.001 69824 2017-09-10T09:24:14.817 -0.058 0.000 -0.019 69841 2017-09-11T18:08:50.817 0.040 0.000 -0.010 69852 2017-09-12T16:48:50.817 -0.025 0.001 -0.008 69866 2017-09-13T21:03:50.817 -0.003 0.000 0.001 69885 2017-09-15T09:18:50.817 0.015 -0.000 -0.001 69901 2017-09-16T17:23:50.817 0.016 0.000 0.006 69916 2017-09-17T23:48:50.817 0.004 -0.000 -0.001 69937 2017-09-19T16:24:26.817 0.001 0.000 0.000 69956 2017-09-21T06:03:50.817 -0.006 0.000 -0.002 69977 2017-09-23T00:23:50.817 -0.014 0.000 0.002 69991 2017-09-24T02:51:50.817 -0.046 -0.000 0.008 70006 2017-09-25T09:33:50.817 0.041 -0.000 0.004 70026 2017-09-27T01:20:00.817 -0.057 -0.000 0.010 70041 2017-09-28T05:58:50.817 0.053 -0.000 0.007 70062 2017-09-29T23:48:50.817 0.033 -0.000 0.013