2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Fri Dec 4 14:01:44 PST 2009 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 33468 through 34584): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2009 JUL 01 00:01:06.184 2009 OCT 01 01:01:06.182 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_od33473-33551_rec_v1.bsp spk_m_od33549-33640_rec_v1.bsp spk_m_od33639-33737_rec_v1.bsp spk_m_od33737-33823_rec_v1.bsp spk_m_od33821-33907_rec_v1.bsp spk_m_od33905-33993_rec_v1.bsp spk_m_od33992-34065_rec_v1.bsp spk_m_od34063-34155_rec_v1.bsp spk_m_od34152-34243_rec_v1.bsp spk_m_od34241-34315_rec_v1.bsp spk_m_od34314-34422_rec_v1.bsp spk_m_od34420-34494_rec_v1.bsp spk_m_od34492-34591_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_ext20.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 33473 2009-07-01T10:53:53.815 0.002 0.000 0.001 33492 2009-07-03T02:02:53.815 0.002 0.000 0.006 33509 2009-07-04T11:39:53.815 0.000 0.000 -0.000 33522 2009-07-05T13:19:53.816 0.000 0.000 0.001 33533 2009-07-06T11:03:53.816 -0.001 -0.000 -0.003 33549 2009-07-07T18:43:53.816 0.001 0.000 0.002 33570 2009-07-09T12:13:53.816 0.004 -0.000 0.015 33588 2009-07-10T23:48:53.816 -0.004 -0.000 -0.016 33609 2009-07-12T17:15:53.816 0.002 -0.000 0.008 33624 2009-07-13T23:10:53.816 -0.000 -0.000 0.000 33639 2009-07-15T03:01:53.816 0.001 -0.000 -0.001 33656 2009-07-16T14:08:53.816 -0.000 0.000 -0.001 33672 2009-07-17T21:44:53.816 -0.002 0.000 -0.007 33681 2009-07-18T15:35:53.816 0.002 -0.000 0.007 33697 2009-07-19T23:18:53.816 -0.001 0.000 -0.002 33716 2009-07-21T12:53:53.816 -0.000 0.000 -0.001 33737 2009-07-23T04:36:23.816 0.001 -0.000 0.000 33753 2009-07-24T13:56:23.816 0.000 -0.000 0.001 33772 2009-07-26T03:28:53.816 -0.002 -0.000 -0.008 33788 2009-07-27T11:05:53.816 0.002 0.000 0.008 33805 2009-07-28T20:42:53.816 -0.001 -0.000 -0.004 33821 2009-07-30T04:20:53.816 0.001 -0.000 0.004 33838 2009-07-31T13:56:53.816 0.000 0.000 -0.000 33850 2009-08-01T11:58:53.816 0.000 0.000 -0.000 33865 2009-08-02T19:18:53.816 -0.002 -0.000 -0.007 33885 2009-08-04T10:48:53.816 0.000 0.000 0.001 33905 2009-08-06T02:29:53.816 0.001 0.000 0.000 33921 2009-08-07T09:58:53.816 0.000 -0.000 -0.000 33937 2009-08-08T17:35:53.816 0.001 0.000 0.003 33951 2009-08-09T19:31:23.816 0.001 -0.000 0.000 33970 2009-08-11T10:48:53.816 0.000 -0.000 0.000 33992 2009-08-13T06:16:53.817 -0.002 -0.000 -0.008 34009 2009-08-14T15:47:53.817 -0.001 0.000 -0.006 34020 2009-08-15T13:31:53.817 -0.001 -0.000 -0.003 34033 2009-08-16T15:13:53.817 0.000 0.000 0.001 34051 2009-08-18T02:48:53.817 0.001 0.000 0.004 34063 2009-08-19T02:33:53.817 0.001 -0.000 0.003 34080 2009-08-20T12:05:53.817 0.000 0.000 0.002 34092 2009-08-21T11:47:53.817 -0.001 -0.000 -0.003 34113 2009-08-23T05:17:53.817 -0.002 0.000 -0.006 34128 2009-08-24T10:58:53.817 0.002 0.000 0.009 34140 2009-08-25T10:43:53.817 -0.002 0.000 -0.007 34152 2009-08-26T10:23:53.817 -0.000 0.000 -0.002 34172 2009-08-28T01:58:53.817 0.000 0.000 -0.001 34192 2009-08-29T17:28:53.817 -0.001 0.000 -0.004 34213 2009-08-31T10:53:53.817 -0.000 -0.000 -0.001 34229 2009-09-01T18:48:53.817 -0.001 -0.000 0.000 34241 2009-09-02T18:13:53.817 0.003 -0.000 0.015 34257 2009-09-04T01:49:53.817 0.003 -0.000 0.013 34264 2009-09-04T15:39:53.817 -0.001 0.000 -0.008 34277 2009-09-05T17:23:53.817 -0.004 -0.000 -0.011 34298 2009-09-07T10:53:53.817 0.004 -0.000 0.016 34314 2009-09-08T18:28:53.817 -0.001 0.000 -0.005 34330 2009-09-10T02:08:53.817 -0.002 -0.000 -0.006 34350 2009-09-11T17:38:53.817 0.002 0.000 0.009 34370 2009-09-13T09:13:53.817 -0.000 0.000 -0.002 34381 2009-09-14T06:49:53.817 -0.000 -0.000 0.000 34397 2009-09-15T14:27:53.817 0.001 0.000 0.004 34408 2009-09-16T12:11:53.817 -0.001 -0.000 -0.006 34420 2009-09-17T11:58:53.817 0.000 -0.000 0.000 34437 2009-09-18T21:33:53.817 -0.001 -0.000 -0.003 34453 2009-09-20T05:08:53.817 -0.001 -0.000 -0.003 34468 2009-09-21T10:43:53.817 0.001 -0.000 0.005 34481 2009-09-22T12:25:53.817 -0.000 0.000 -0.001 34492 2009-09-23T10:11:53.817 -0.001 -0.000 -0.002 34508 2009-09-24T17:47:53.817 -0.001 -0.000 -0.004 34528 2009-09-26T09:17:53.817 0.001 -0.000 0.005 34541 2009-09-27T10:59:53.817 -0.001 -0.000 -0.006 34553 2009-09-28T10:48:53.817 0.002 -0.000 0.005 34573 2009-09-30T02:13:53.817 -0.001 0.000 -0.004