2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Aug 11 12:00:22 PDT 2016 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 63423 through 64527): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 APR 01 00:01:08.185 2016 JUL 01 01:01:08.184 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_od63411-63502_rec_v1.bsp spk_m_od63501-63576_rec_v1.bsp spk_m_od63575-63668_rec_v1.bsp spk_m_od63666-63755_rec_v1.bsp spk_m_od63754-63842_rec_v1.bsp spk_m_od63840-63915_rec_v1.bsp spk_m_od63913-64002_rec_v1.bsp spk_m_od64000-64083_rec_v1.bsp spk_m_od64082-64180_rec_v1.bsp spk_m_od64179-64265_rec_v1.bsp spk_m_od64264-64350_rec_v1.bsp spk_m_od64349-64422_rec_v1.bsp spk_m_od64421-64515_rec_v1.bsp spk_m_od64514-64606_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_ext47.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 63428 2016-04-01T11:44:11.814 -0.005 -0.001 -0.001 63453 2016-04-03T12:25:51.814 0.014 -0.001 0.001 63466 2016-04-04T13:42:51.814 0.013 0.000 -0.002 63484 2016-04-06T02:35:51.814 0.004 0.000 0.000 63501 2016-04-07T11:28:28.814 -0.020 -0.000 -0.003 63523 2016-04-09T07:02:54.814 -0.035 0.000 -0.005 63540 2016-04-10T16:34:15.814 0.053 -0.001 0.006 63559 2016-04-12T05:58:51.814 -0.042 0.000 -0.003 63575 2016-04-13T14:14:51.814 -0.003 -0.001 -0.000 63596 2016-04-15T06:06:51.814 0.058 0.001 -0.003 63612 2016-04-16T14:53:51.814 0.048 -0.001 0.004 63628 2016-04-17T22:46:51.814 0.029 -0.000 0.003 63646 2016-04-19T10:22:08.814 -0.036 0.000 -0.003 63666 2016-04-21T01:37:36.814 -0.010 -0.001 -0.001 63684 2016-04-22T13:57:27.814 -0.044 0.001 0.002 63704 2016-04-24T04:42:02.814 0.037 -0.001 0.002 63719 2016-04-25T10:08:51.814 0.094 -0.001 0.005 63733 2016-04-26T13:11:51.814 -0.122 0.000 0.004 63754 2016-04-28T06:43:51.814 0.134 0.001 -0.002 63770 2016-04-29T15:12:51.814 0.176 0.000 0.006 63781 2016-04-30T13:43:51.814 -0.030 0.000 0.002 63801 2016-05-02T05:02:40.814 0.002 0.000 -0.001 63821 2016-05-03T19:08:17.814 -0.014 -0.000 -0.000 63830 2016-05-04T13:03:14.814 0.071 -0.001 0.005 63840 2016-05-05T09:34:51.814 0.043 -0.001 0.001 63861 2016-05-07T02:06:51.814 0.058 -0.002 -0.001 63879 2016-05-08T14:32:51.814 -0.032 -0.000 -0.002 63898 2016-05-10T04:07:56.814 -0.017 0.000 -0.001 63913 2016-05-11T09:01:25.814 0.038 0.000 0.003 63929 2016-05-12T17:13:03.814 -0.031 0.000 -0.006 63947 2016-05-14T04:21:57.814 0.019 0.000 0.004 63967 2016-05-15T20:36:43.814 0.026 -0.001 -0.000 63985 2016-05-17T08:56:51.814 -0.017 -0.000 0.003 64000 2016-05-18T14:26:13.814 0.011 0.000 -0.003 64019 2016-05-20T03:02:43.814 0.008 0.000 0.002 64034 2016-05-21T08:08:51.814 0.009 -0.001 0.001 64052 2016-05-22T19:55:03.814 -0.009 0.000 -0.003 64071 2016-05-24T09:25:51.814 0.018 -0.001 0.005 64082 2016-05-25T07:41:05.814 -0.016 -0.000 -0.005 64109 2016-05-27T12:13:35.814 0.007 0.001 -0.001 64128 2016-05-29T03:01:45.815 -0.018 -0.000 0.005 64143 2016-05-30T09:14:35.815 0.000 -0.000 -0.000 64162 2016-05-31T22:53:51.815 0.001 0.000 -0.000 64179 2016-06-02T06:53:17.815 -0.008 -0.001 -0.003 64195 2016-06-03T14:48:21.815 -0.001 -0.000 -0.000 64225 2016-06-06T02:22:47.815 0.008 -0.000 0.003 64240 2016-06-07T08:55:51.815 -0.002 0.000 0.001 64264 2016-06-09T07:02:51.815 0.006 -0.000 0.004 64289 2016-06-11T09:30:51.815 0.002 -0.000 -0.001 64312 2016-06-13T07:08:51.815 -0.000 -0.000 0.001 64332 2016-06-14T22:40:21.815 -0.000 0.000 0.000 64349 2016-06-16T07:05:51.815 0.005 -0.000 0.003 64366 2016-06-17T17:41:51.815 -0.000 -0.000 0.000 64386 2016-06-19T09:06:51.815 -0.000 0.000 0.000 64397 2016-06-20T07:07:50.815 0.001 -0.000 -0.001 64410 2016-06-21T08:47:56.815 -0.001 0.000 0.001 64421 2016-06-22T05:27:51.815 0.001 -0.000 0.001 64444 2016-06-24T04:01:51.815 -0.003 0.000 0.004 64467 2016-06-26T01:28:51.815 0.000 -0.000 -0.000 64487 2016-06-27T16:52:51.815 -0.001 -0.000 0.000 64496 2016-06-28T10:43:11.815 0.003 0.000 -0.003 64514 2016-06-29T21:18:51.815 -0.003 -0.000 -0.003