2001 Mars Odyssey Extended SPK file, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, October 7, 2005 Objects in the Ephemeris -------------------------------------------------------- This file contains ephemeris data for 2001 Mars Odyssey (M01) spacecraft. NAIF ID code for M01 is -53. Approximate Time Coverage -------------------------------------------------------- This file covers the following part of the Extended phase of the M01 mission: COVERAGE BEGIN TIME (TDB): 2005 JUL 01 00:00:00.000 COVERAGE END TIME (TDB): 2005 OCT 01 01:00:00.000 Status -------------------------------------------------------- This file was created by merging regular reconstructed OD solution SPK files produced by M01 NAV during Extended phase of the mission. The file was created by NAIF for archiving with 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 (FIS/DOM) by M01 NAV. The list of the original files data from which has been merged into this file is provided in the 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 coverage immediately precede and follow it. The times and magnitudes of these discontinuities are provided in the Appendix 2 of these comments. Usage -------------------------------------------------------- This file should be used together with DE405 planetary 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, bsemenov@spice.jpl.nasa.gov or M01 NAV Team Lead: Robert A. Mase (818)-354-8990 Robert.A.Mase@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_od15697-15786_rec_v1.bsp spk_m_od15785-15877_rec_v1.bsp spk_m_od15876-15958_rec_v1.bsp spk_m_od15957-16042_rec_v1.bsp spk_m_od16041-16127_rec_v1.bsp spk_m_od16126-16215_rec_v1.bsp spk_m_od16214-16298_rec_v1.bsp spk_m_od16297-16387_rec_v1.bsp spk_m_od16386-16480_rec_v1.bsp spk_m_od16479-16570_rec_v1.bsp spk_m_od16569-16644_rec_v1.bsp spk_m_od16643-16731_rec_v1.bsp spk_m_od16730-16821_rec_v1.bsp spk_m_od16820-16908_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_ext4.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 15739 2005-07-02T07:21:55.815 0.000 -0.000 0.000 15762 2005-07-04T04:48:55.815 0.001 0.000 0.002 15785 2005-07-06T02:15:55.816 0.001 0.000 0.002 15809 2005-07-08T01:40:55.816 0.002 -0.000 0.005 15833 2005-07-10T01:08:55.816 -0.001 -0.000 -0.003 15853 2005-07-11T16:38:55.816 -0.001 0.000 -0.001 15876 2005-07-13T14:04:55.816 0.001 0.000 0.002 15895 2005-07-15T03:35:55.816 0.002 0.000 0.005 15914 2005-07-16T17:08:55.816 0.001 -0.000 0.003 15935 2005-07-18T10:38:55.816 -0.002 0.000 -0.005 15957 2005-07-20T06:08:55.816 0.001 0.000 0.002 15976 2005-07-21T19:38:55.816 -0.000 0.000 -0.000 15998 2005-07-23T15:07:55.816 -0.001 0.000 -0.002 16021 2005-07-25T12:34:55.816 0.001 0.000 0.002 16041 2005-07-27T04:08:55.816 0.001 0.000 0.002 16061 2005-07-28T19:38:55.816 -0.000 -0.000 0.000 16085 2005-07-30T19:01:55.816 -0.000 -0.000 -0.001 16106 2005-08-01T12:30:55.816 0.000 0.000 0.001 16126 2005-08-03T04:02:55.816 0.001 -0.000 0.002 16148 2005-08-04T23:30:55.816 -0.001 -0.000 -0.003 16170 2005-08-06T18:58:55.816 0.000 -0.000 0.001 16193 2005-08-08T16:28:55.816 0.001 0.000 0.003 16214 2005-08-10T09:53:55.816 -0.001 0.000 -0.002 16237 2005-08-12T07:23:55.817 0.000 -0.000 0.001 16259 2005-08-14T02:50:55.817 0.000 -0.000 0.000 16278 2005-08-15T16:23:55.817 0.000 0.000 0.000 16297 2005-08-17T05:55:55.817 0.001 -0.000 0.002 16318 2005-08-18T23:34:55.817 0.003 0.000 0.007 16338 2005-08-20T14:58:55.817 -0.002 -0.000 -0.004 16362 2005-08-22T14:38:55.817 0.001 0.000 0.002 16386 2005-08-24T13:48:55.817 -0.001 -0.000 -0.002 16409 2005-08-26T11:13:55.817 0.002 -0.000 0.004 16433 2005-08-28T10:39:55.817 -0.001 0.000 -0.002 16456 2005-08-30T08:05:55.817 0.002 0.000 0.003 16479 2005-09-01T05:33:55.817 -0.002 0.000 -0.003 16501 2005-09-03T01:01:55.817 -0.001 0.000 -0.002 16525 2005-09-05T00:28:55.817 0.004 0.000 0.007 16546 2005-09-06T17:53:55.817 -0.002 -0.000 -0.004 16569 2005-09-08T15:23:55.817 -0.001 0.000 -0.002 16592 2005-09-10T12:48:55.817 -0.000 -0.000 -0.000 16614 2005-09-12T08:17:55.817 0.003 0.000 0.005 16626 2005-09-13T08:00:55.817 -0.002 -0.000 -0.003 16643 2005-09-14T17:28:55.817 -0.001 0.000 -0.002 16665 2005-09-16T12:58:55.817 -0.002 0.000 -0.003 16687 2005-09-18T08:33:55.817 -0.002 0.000 -0.003 16706 2005-09-19T22:03:55.817 -0.001 0.000 -0.002 16730 2005-09-21T21:43:55.817 0.009 0.000 0.015 16751 2005-09-23T15:03:55.817 0.003 -0.000 0.004 16773 2005-09-25T10:28:55.817 -0.000 0.000 -0.000 16795 2005-09-27T05:58:55.817 0.000 0.000 0.000 16820 2005-09-29T07:18:55.817 -0.002 0.000 -0.003 16840 2005-09-30T22:53:55.817 -0.002 -0.000 -0.002