2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon May 20 10:55:21 PDT 2013 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 49015 through 50108): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2013 JAN 01 00:01:07.183 2013 APR 01 01:01:07.185 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_od49041-49121_rec_v1.bsp spk_m_od49120-49197_rec_v1.bsp spk_m_od49196-49279_rec_v1.bsp spk_m_od49277-49378_rec_v1.bsp spk_m_od49377-49448_rec_v1.bsp spk_m_od49448-49538_rec_v1.bsp spk_m_od49538-49626_rec_v1.bsp spk_m_od49625-49713_rec_v1.bsp spk_m_od49712-49804_rec_v1.bsp spk_m_od49802-49878_rec_v1.bsp spk_m_od49875-49976_rec_v1.bsp spk_m_od49974-50047_rec_v1.bsp spk_m_od50045-50134_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_ext34.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 49026 2013-01-01T22:47:42.816 -0.033 -0.000 -0.004 49040 2013-01-03T02:59:52.816 0.010 0.000 -0.004 49054 2013-01-04T06:55:52.815 0.023 -0.000 -0.006 49063 2013-01-04T23:40:52.815 0.019 0.000 0.006 49075 2013-01-05T23:54:52.815 -0.009 -0.000 0.002 49084 2013-01-06T17:43:52.815 0.067 -0.000 -0.021 49096 2013-01-07T17:13:52.815 -0.008 0.000 0.001 49108 2013-01-08T17:26:07.815 -0.009 -0.000 0.004 49119 2013-01-09T15:31:37.815 -0.034 0.000 0.002 49132 2013-01-10T17:26:12.815 -0.058 -0.000 -0.014 49148 2013-01-12T01:11:12.815 -0.042 -0.000 -0.016 49168 2013-01-13T16:53:52.815 -0.013 0.000 -0.005 49185 2013-01-15T01:10:57.815 -0.023 -0.000 0.008 49195 2013-01-15T21:18:52.815 0.015 -0.000 -0.006 49209 2013-01-17T01:33:52.815 -0.023 -0.000 -0.008 49220 2013-01-17T23:13:52.815 -0.011 -0.000 -0.003 49234 2013-01-19T01:33:52.815 0.010 0.000 0.002 49246 2013-01-20T01:33:52.815 0.010 -0.000 -0.002 49257 2013-01-21T00:02:47.815 0.028 -0.000 -0.003 49276 2013-01-22T13:33:52.815 0.005 -0.000 -0.001 49292 2013-01-23T21:43:52.815 -0.018 0.000 -0.009 49310 2013-01-25T08:38:52.815 0.004 -0.000 -0.001 49329 2013-01-26T21:21:42.815 -0.003 0.000 0.000 49341 2013-01-27T21:45:57.815 -0.027 0.000 0.010 49363 2013-01-29T17:21:52.815 0.002 0.000 -0.000 49376 2013-01-30T19:13:52.815 -0.011 -0.000 -0.002 49395 2013-02-01T08:28:52.815 0.003 0.000 -0.001 49412 2013-02-02T17:34:52.815 -0.023 0.000 0.011 49430 2013-02-04T04:44:52.815 -0.015 -0.000 -0.002 49447 2013-02-05T14:08:52.815 0.021 -0.000 0.008 49462 2013-02-06T20:16:52.815 0.038 -0.001 -0.017 49476 2013-02-08T00:40:52.815 -0.020 -0.000 -0.002 49492 2013-02-09T08:15:52.815 0.003 0.000 0.000 49510 2013-02-10T18:43:52.814 0.001 -0.000 0.000 49524 2013-02-11T22:23:52.814 0.006 -0.000 0.001 49537 2013-02-13T00:23:52.814 0.029 -0.000 -0.014 49553 2013-02-14T08:22:52.814 0.015 -0.000 -0.008 49572 2013-02-15T21:53:52.814 0.010 -0.000 -0.006 49586 2013-02-17T00:52:52.814 0.007 0.000 0.000 49597 2013-02-17T22:28:52.814 0.016 0.000 0.005 49609 2013-02-18T22:28:52.814 -0.005 -0.000 0.002 49624 2013-02-20T05:08:52.814 -0.018 0.000 -0.008 49633 2013-02-20T22:33:52.814 0.011 -0.000 -0.003 49653 2013-02-22T13:21:52.814 0.004 0.000 -0.001 49678 2013-02-24T14:49:52.814 -0.008 -0.000 0.004 49698 2013-02-26T06:03:52.814 0.014 -0.000 0.001 49711 2013-02-27T08:59:52.814 -0.008 -0.000 -0.004 49729 2013-02-28T20:15:52.814 -0.010 -0.000 0.001 49745 2013-03-02T03:50:52.814 0.002 0.001 -0.000 49754 2013-03-02T20:56:52.814 -0.008 0.000 0.004 49768 2013-03-04T01:15:52.814 0.004 0.000 -0.001 49784 2013-03-05T07:44:52.814 -0.005 0.000 -0.003 49801 2013-03-06T19:04:52.814 0.007 -0.000 0.005 49818 2013-03-08T02:53:52.814 -0.003 -0.000 -0.002 49835 2013-03-09T13:14:52.814 -0.003 0.000 0.002 49853 2013-03-11T00:48:52.814 0.006 0.000 -0.004 49865 2013-03-12T00:48:52.814 0.005 -0.000 -0.001 49874 2013-03-12T19:14:52.814 -0.003 0.000 -0.002 49886 2013-03-13T17:17:52.814 0.005 0.000 0.001 49898 2013-03-14T17:05:52.814 0.003 -0.000 -0.000 49912 2013-03-15T21:37:52.814 -0.012 0.000 0.002 49929 2013-03-17T07:11:52.814 0.006 -0.000 -0.001 49948 2013-03-18T20:42:52.814 0.004 -0.000 -0.001 49961 2013-03-19T22:13:52.814 -0.009 -0.000 0.005 49973 2013-03-20T22:46:52.814 -0.007 -0.001 -0.005 49994 2013-03-22T14:28:52.814 -0.009 -0.000 -0.004 50009 2013-03-23T20:48:52.814 -0.010 0.000 0.008 50024 2013-03-25T02:28:52.814 0.006 -0.000 -0.004 50034 2013-03-25T21:57:52.814 -0.010 -0.000 0.007 50044 2013-03-26T18:59:52.814 0.013 0.000 0.011 50060 2013-03-28T01:27:52.814 0.006 -0.000 -0.004 50077 2013-03-29T10:48:52.814 -0.000 0.000 -0.000 50092 2013-03-30T16:58:52.814 0.001 -0.000 0.000 50104 2013-03-31T16:47:52.814 -0.002 0.000 0.000