2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Sun May 10 11:23:55 PDT 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 31270 through 32362): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2009 JAN 01 00:01:06.183 2009 APR 01 01:01:06.185 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_od31342-31445_rec_v1.bsp spk_m_od31443-31523_rec_v1.bsp spk_m_od31522-31606_rec_v1.bsp spk_m_od31605-31688_rec_v1.bsp spk_m_od31686-31777_rec_v1.bsp spk_m_od31776-31862_rec_v1.bsp spk_m_od31862-31948_rec_v1.bsp spk_m_od31946-32033_rec_v1.bsp spk_m_od32031-32091_rec_v1.bsp spk_m_od32086-32195_rec_v1.bsp spk_m_od32193-32295_rec_v1.bsp spk_m_od32293-32373_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_ext18.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 31286 2009-01-02T10:08:53.816 -0.022 0.000 -0.006 31303 2009-01-03T19:46:53.815 -0.002 0.000 -0.001 31328 2009-01-05T20:13:53.815 0.004 -0.000 -0.001 31342 2009-01-07T00:43:53.815 0.010 -0.000 0.003 31364 2009-01-08T19:58:53.815 -0.025 -0.000 -0.002 31386 2009-01-10T15:53:53.815 0.039 0.001 0.013 31401 2009-01-11T21:21:53.815 -0.015 -0.000 -0.004 31425 2009-01-13T20:46:53.815 -0.018 -0.000 -0.005 31443 2009-01-15T08:40:53.815 -0.032 0.000 -0.011 31468 2009-01-17T08:37:53.815 -0.034 -0.001 0.006 31487 2009-01-18T22:38:53.815 -0.018 -0.000 0.006 31509 2009-01-20T18:18:53.815 0.011 0.000 -0.003 31522 2009-01-21T19:43:53.815 0.002 -0.000 -0.001 31542 2009-01-23T11:28:53.815 -0.002 0.000 0.000 31565 2009-01-25T09:13:53.815 -0.006 0.000 -0.000 31583 2009-01-26T19:36:53.815 -0.001 0.000 -0.000 31594 2009-01-27T19:01:53.815 -0.005 -0.000 -0.002 31605 2009-01-28T15:56:53.815 -0.002 0.000 0.001 31619 2009-01-29T19:35:53.815 -0.009 0.000 0.004 31643 2009-01-31T19:34:53.815 0.005 -0.000 0.002 31667 2009-02-02T18:13:53.815 0.021 -0.000 -0.011 31686 2009-02-04T08:33:53.815 0.012 0.000 0.004 31702 2009-02-05T16:13:53.815 0.006 0.000 0.002 31727 2009-02-07T17:43:53.815 -0.002 -0.000 -0.001 31752 2009-02-09T19:29:53.814 -0.010 -0.000 -0.005 31776 2009-02-11T18:27:53.814 0.020 -0.000 0.008 31796 2009-02-13T09:58:53.814 0.011 -0.000 0.004 31813 2009-02-14T19:34:53.814 -0.011 -0.000 -0.004 31837 2009-02-16T19:08:53.814 -0.009 -0.000 -0.005 31862 2009-02-18T19:23:53.814 0.005 -0.000 -0.001 31882 2009-02-20T12:03:53.814 -0.013 -0.000 -0.007 31898 2009-02-21T19:38:53.814 0.019 0.001 0.009 31918 2009-02-23T11:00:53.814 -0.008 -0.000 -0.002 31929 2009-02-24T08:55:53.814 0.011 -0.000 0.006 31946 2009-02-25T18:25:53.814 -0.012 0.000 -0.005 31965 2009-02-27T08:06:53.814 -0.008 -0.000 -0.005 31981 2009-02-28T15:43:53.814 -0.003 -0.000 -0.002 31995 2009-03-01T19:23:53.814 -0.017 -0.000 -0.011 32017 2009-03-03T14:53:53.814 0.002 -0.000 0.002 32031 2009-03-04T18:33:53.814 0.007 -0.000 0.005 32052 2009-03-06T12:03:53.814 -0.003 -0.000 -0.002 32069 2009-03-07T20:23:53.814 0.005 -0.000 0.000 32086 2009-03-09T07:14:53.814 -0.005 -0.000 -0.003 32094 2009-03-09T23:04:53.814 -0.014 -0.000 -0.010 32113 2009-03-11T12:43:53.814 0.142 0.002 0.124 32128 2009-03-12T16:48:53.814 -0.033 -0.000 -0.016 32149 2009-03-14T11:47:53.814 -0.001 -0.000 -0.001 32171 2009-03-16T07:16:53.814 0.005 0.000 0.004 32193 2009-03-18T02:48:53.814 -0.004 -0.000 -0.003 32208 2009-03-19T06:58:53.814 -0.002 0.000 -0.001 32226 2009-03-20T20:03:53.814 0.005 0.000 0.005 32249 2009-03-22T17:28:53.814 -0.001 -0.000 -0.001 32273 2009-03-24T16:51:53.814 -0.003 0.000 -0.003 32293 2009-03-26T08:21:53.814 -0.001 0.000 -0.002 32312 2009-03-27T21:56:53.814 -0.002 -0.000 -0.002 32333 2009-03-29T15:28:53.814 -0.001 -0.000 -0.001 32357 2009-03-31T14:53:53.814 0.004 0.000 0.005