2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Wed Aug 5 12:27:42 PDT 2020 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 81161 through 82265): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2020 APR 01 00:01:09.185 2020 JUL 01 01:01:09.184 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_od81089-81179_rec_v1.bsp spk_m_od81178-81256_rec_v1.bsp spk_m_od81254-81350_rec_v1.bsp spk_m_od81349-81436_rec_v1.bsp spk_m_od81435-81516_rec_v1.bsp spk_m_od81514-81592_rec_v1.bsp spk_m_od81590-81690_rec_v1.bsp spk_m_od81688-81765_rec_v1.bsp spk_m_od81763-81855_rec_v1.bsp spk_m_od81853-81942_rec_v1.bsp spk_m_od81941-82024_rec_v1.bsp spk_m_od82021-82114_rec_v1.bsp spk_m_od82113-82199_rec_v1.bsp spk_m_od82197-82270_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_ext63.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 81167 2020-04-01T14:56:50.814 -0.004 0.000 -0.001 81178 2020-04-02T11:44:50.814 -0.009 -0.000 0.002 81200 2020-04-04T08:20:50.814 0.004 0.000 0.001 81213 2020-04-05T08:47:50.814 -0.003 -0.000 0.000 81228 2020-04-06T14:27:50.814 -0.001 0.000 0.000 81241 2020-04-07T16:02:50.814 0.003 0.000 0.000 81254 2020-04-08T19:08:50.814 -0.004 0.000 -0.002 81285 2020-04-11T07:52:50.814 -0.005 0.000 0.001 81303 2020-04-12T18:46:50.814 0.005 0.000 -0.001 81323 2020-04-14T10:57:50.814 -0.002 0.000 0.000 81338 2020-04-15T15:39:50.814 -0.005 -0.000 -0.001 81349 2020-04-16T13:53:50.814 -0.001 0.000 0.000 81361 2020-04-17T13:58:50.814 0.003 0.000 -0.001 81372 2020-04-18T11:13:50.814 0.006 0.000 -0.002 81389 2020-04-19T21:18:50.814 -0.021 0.000 0.009 81407 2020-04-21T07:59:50.814 0.019 0.000 0.006 81421 2020-04-22T12:32:50.814 -0.009 0.000 0.004 81435 2020-04-23T16:40:50.814 -0.018 -0.000 -0.006 81455 2020-04-25T08:15:50.814 -0.007 -0.000 -0.003 81471 2020-04-26T15:18:50.814 -0.008 0.000 0.004 81481 2020-04-27T11:05:50.814 -0.002 -0.000 0.001 81502 2020-04-29T04:32:50.814 0.019 0.000 -0.010 81514 2020-04-30T03:32:50.814 -0.009 0.000 -0.001 81531 2020-05-01T12:59:50.814 -0.008 -0.000 -0.003 81540 2020-05-02T08:29:50.814 0.004 -0.000 0.003 81555 2020-05-03T13:14:50.814 0.004 -0.000 -0.003 81568 2020-05-04T14:34:50.814 -0.006 0.000 0.003 81574 2020-05-05T02:35:50.814 -0.005 0.000 0.003 81590 2020-05-06T11:01:50.814 -0.001 -0.000 -0.000 81613 2020-05-08T08:38:50.814 -0.006 -0.000 -0.004 81629 2020-05-09T15:17:50.814 0.015 -0.000 -0.010 81639 2020-05-10T11:08:50.814 -0.000 0.000 0.000 81648 2020-05-11T06:04:50.814 -0.025 -0.000 -0.015 81662 2020-05-12T08:03:50.814 0.022 0.000 0.001 81677 2020-05-13T14:18:50.814 0.004 0.000 -0.002 81688 2020-05-14T12:42:50.814 -0.009 0.000 -0.005 81710 2020-05-16T07:31:50.814 0.000 -0.000 -0.000 81727 2020-05-17T17:03:50.814 0.022 -0.001 -0.016 81738 2020-05-18T14:35:50.814 -0.005 0.000 0.003 81748 2020-05-19T10:36:50.814 -0.016 0.000 0.011 81763 2020-05-20T16:54:50.814 0.007 -0.000 0.004 81786 2020-05-22T13:24:50.814 0.002 -0.000 -0.001 81799 2020-05-23T15:21:50.814 -0.002 0.000 0.002 81813 2020-05-24T18:29:50.814 -0.005 0.000 0.001 81835 2020-05-26T14:30:50.814 0.012 -0.000 -0.009 81853 2020-05-28T02:55:50.815 0.002 -0.000 0.002 81868 2020-05-29T07:27:50.815 -0.003 0.000 0.002 81886 2020-05-30T19:09:50.815 -0.013 -0.000 0.010 81896 2020-05-31T16:10:50.815 0.022 0.000 0.014 81920 2020-06-02T14:21:50.815 -0.005 -0.000 0.004 81931 2020-06-03T11:50:50.815 0.001 -0.000 -0.000 81941 2020-06-04T08:40:50.815 0.008 -0.000 0.005 81966 2020-06-06T09:21:50.815 -0.013 0.000 0.010 81986 2020-06-08T00:51:50.815 0.004 0.000 -0.003 82011 2020-06-10T02:16:50.815 -0.004 -0.000 0.003 82021 2020-06-10T21:45:50.815 0.010 -0.000 -0.007 82039 2020-06-12T09:34:50.815 0.014 0.000 -0.012 82052 2020-06-13T12:20:50.815 -0.020 0.000 -0.015 82067 2020-06-14T18:06:50.815 0.012 0.000 0.007 82080 2020-06-15T18:36:50.815 0.013 0.000 -0.011 82102 2020-06-17T14:05:50.815 -0.003 0.000 0.002 82113 2020-06-18T12:36:50.815 -0.013 -0.000 -0.010 82126 2020-06-19T13:27:50.815 -0.020 0.000 0.017 82139 2020-06-20T14:52:50.815 0.017 0.000 -0.009 82151 2020-06-21T14:50:50.815 -0.031 0.001 0.027 82174 2020-06-23T12:05:50.815 0.018 -0.000 -0.012 82184 2020-06-24T07:54:50.815 -0.005 -0.000 0.004 82197 2020-06-25T10:34:50.815 -0.004 -0.000 -0.003 82211 2020-06-26T13:28:50.815 0.005 0.000 -0.005 82224 2020-06-27T14:35:50.815 0.006 0.000 0.001 82236 2020-06-28T14:32:50.815 0.001 -0.000 -0.001 82259 2020-06-30T12:19:50.815 -0.011 0.000 0.009