2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Tue Nov 22 06:41:45 PST 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 64528 through 65644): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 JUL 01 00:01:08.184 2016 OCT 01 01:01:08.182 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_od64514-64606_rec_v1.bsp spk_m_od64604-64681_rec_v1.bsp spk_m_od64680-64773_rec_v1.bsp spk_m_od64772-64857_rec_v1.bsp spk_m_od64856-64942_rec_v1.bsp spk_m_od64941-65025_rec_v1.bsp spk_m_od65022-65112_rec_v1.bsp spk_m_od65111-65197_rec_v1.bsp spk_m_od65196-65287_rec_v1.bsp spk_m_od65287-65368_rec_v1.bsp spk_m_od65367-65457_rec_v1.bsp spk_m_od65456-65542_rec_v1.bsp spk_m_od65541-65618_rec_v1.bsp spk_m_od65617-65711_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_ext48.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 64534 2016-07-01T13:54:51.815 0.002 0.000 -0.002 64555 2016-07-03T07:25:51.815 0.000 -0.000 -0.001 64576 2016-07-05T00:12:24.816 -0.002 0.000 -0.002 64594 2016-07-06T12:07:34.816 -0.003 0.000 0.001 64604 2016-07-07T07:11:19.816 0.000 -0.000 0.001 64619 2016-07-08T13:08:30.816 -0.004 0.000 -0.004 64636 2016-07-09T23:20:32.816 -0.002 0.000 0.002 64648 2016-07-10T23:15:00.816 0.006 0.000 -0.008 64665 2016-07-12T08:11:51.816 -0.002 0.000 -0.002 64680 2016-07-13T14:18:51.816 -0.002 0.000 0.002 64701 2016-07-15T07:58:51.816 -0.002 0.000 0.003 64725 2016-07-17T07:26:51.816 -0.000 0.000 0.000 64749 2016-07-19T06:53:51.816 0.001 0.000 -0.001 64760 2016-07-20T04:37:10.816 0.009 -0.000 -0.012 64772 2016-07-21T03:49:43.816 -0.023 0.000 -0.010 64786 2016-07-22T08:00:29.816 -0.013 0.000 0.018 64805 2016-07-23T21:34:55.816 -0.002 -0.000 0.003 64819 2016-07-25T01:14:13.816 -0.001 -0.000 0.001 64840 2016-07-26T18:45:27.816 -0.001 0.000 0.001 64856 2016-07-28T01:13:14.816 0.002 0.000 0.002 64876 2016-07-29T17:56:01.816 0.002 0.000 -0.004 64900 2016-07-31T17:22:30.816 -0.001 0.000 0.001 64919 2016-08-02T06:18:51.816 -0.000 0.000 -0.000 64941 2016-08-04T01:26:51.816 0.000 -0.000 0.000 64957 2016-08-05T09:50:51.816 0.000 -0.000 -0.000 64980 2016-08-07T07:31:51.816 -0.001 0.000 0.002 64992 2016-08-08T07:13:05.816 0.001 0.000 -0.002 65005 2016-08-09T08:55:05.816 0.001 -0.000 -0.001 65022 2016-08-10T17:22:54.816 -0.002 -0.000 -0.001 65042 2016-08-12T10:03:48.817 -0.000 0.000 0.001 65056 2016-08-13T13:44:24.817 -0.001 0.000 0.002 65075 2016-08-15T03:18:56.817 0.001 -0.000 -0.001 65092 2016-08-16T12:53:51.817 0.000 0.000 -0.001 65111 2016-08-18T01:30:51.817 -0.000 -0.000 -0.001 65135 2016-08-20T01:54:51.817 0.005 -0.000 -0.007 65152 2016-08-21T11:31:51.817 -0.003 -0.000 0.005 65168 2016-08-22T19:09:41.817 -0.004 -0.000 0.006 65185 2016-08-24T04:46:02.817 -0.001 0.000 0.001 65196 2016-08-25T01:58:51.817 0.003 -0.000 0.003 65214 2016-08-26T14:04:51.817 0.002 0.000 -0.003 65232 2016-08-28T01:40:51.817 -0.003 0.000 0.006 65246 2016-08-29T05:16:51.817 0.001 0.000 -0.002 65262 2016-08-30T12:58:42.817 0.003 -0.000 -0.005 65276 2016-08-31T16:39:34.817 0.002 0.000 -0.004 65287 2016-09-01T13:24:32.817 -0.000 -0.000 -0.001 65299 2016-09-02T14:06:06.817 -0.000 -0.000 0.000 65318 2016-09-04T03:41:11.817 -0.002 0.000 0.003 65335 2016-09-05T13:16:03.817 0.001 -0.000 -0.002 65355 2016-09-07T04:48:51.817 0.002 0.000 -0.003 65367 2016-09-08T03:35:51.817 -0.001 -0.000 -0.002 65391 2016-09-10T03:58:51.817 0.000 0.000 -0.000 65411 2016-09-11T18:48:51.817 0.001 0.000 0.001 65431 2016-09-13T11:03:40.471 0.001 -0.000 -0.002 65447 2016-09-14T18:41:20.817 0.003 -0.000 -0.005 65456 2016-09-15T11:59:34.817 -0.003 0.000 -0.002 65479 2016-09-17T09:56:37.817 -0.001 0.000 0.002 65493 2016-09-18T13:37:31.817 0.001 -0.000 -0.001 65517 2016-09-20T13:03:51.817 -0.002 -0.000 0.003 65541 2016-09-22T12:15:18.817 -0.002 0.000 0.001 65562 2016-09-24T05:37:01.817 0.000 0.000 0.000 65579 2016-09-25T15:38:39.817 0.001 0.000 -0.001 65594 2016-09-26T20:48:46.817 0.001 -0.000 0.000 65617 2016-09-28T17:49:51.817 0.002 0.000 0.003 65640 2016-09-30T16:15:51.817 0.003 -0.000 -0.005