2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Mon Jan 30 08:06:59 PST 2017 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 65645 through 66761): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2016 OCT 01 00:01:08.182 2017 JAN 01 01:01:09.183 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_od65617-65711_rec_v1.bsp spk_m_od65705-65793_rec_v1.bsp spk_m_od65791-65881_rec_v1.bsp spk_m_od65880-65966_rec_v1.bsp spk_m_od65965-66047_rec_v1.bsp spk_m_od66046-66136_rec_v1.bsp spk_m_od66136-66221_rec_v1.bsp spk_m_od66220-66277_rec_v1.bsp spk_m_od66276-66391_rec_v1.bsp spk_m_od66390-66471_rec_v1.bsp spk_m_od66470-66553_rec_v1.bsp spk_m_od66552-66633_rec_v1.bsp spk_m_od66632-66726_rec_v1.bsp spk_m_od66725-66811_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_ext49.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 65658 2016-10-02T03:49:51.817 -0.000 0.000 0.000 65675 2016-10-03T13:26:06.817 0.002 -0.000 -0.002 65695 2016-10-05T04:28:26.817 -0.001 -0.000 -0.001 65705 2016-10-05T23:45:38.817 0.004 0.000 0.006 65723 2016-10-07T12:19:48.817 0.003 0.000 -0.005 65742 2016-10-09T01:54:28.817 -0.000 -0.000 0.000 65755 2016-10-10T03:35:38.817 -0.002 -0.000 0.003 65772 2016-10-11T12:57:51.817 0.000 0.000 -0.000 65791 2016-10-13T01:48:51.817 -0.003 -0.000 -0.004 65811 2016-10-14T18:18:51.817 -0.000 0.000 0.001 65836 2016-10-16T19:44:51.817 -0.001 -0.000 0.002 65855 2016-10-18T09:18:03.817 -0.000 0.000 0.001 65880 2016-10-20T10:10:51.817 -0.001 -0.000 -0.001 65900 2016-10-22T02:15:51.817 -0.001 -0.000 0.002 65918 2016-10-23T13:16:51.817 -0.004 0.000 -0.003 65930 2016-10-24T13:16:51.817 0.001 0.000 -0.000 65942 2016-10-25T13:12:24.817 -0.005 0.000 0.006 65955 2016-10-26T14:59:58.817 0.006 0.000 -0.010 65965 2016-10-27T09:46:40.817 -0.003 -0.000 -0.004 65985 2016-10-29T02:08:49.817 -0.000 -0.000 0.000 65998 2016-10-30T04:01:45.817 0.003 -0.000 -0.005 66022 2016-11-01T03:26:51.817 -0.002 0.000 0.004 66046 2016-11-03T01:56:51.817 -0.002 0.000 -0.003 66067 2016-11-04T20:25:51.817 -0.000 0.000 0.001 66087 2016-11-06T11:38:51.817 -0.003 0.000 0.001 66103 2016-11-07T19:36:23.817 0.002 -0.000 -0.003 66118 2016-11-09T01:17:04.817 -0.000 0.000 0.000 66136 2016-11-10T12:18:59.817 -0.003 -0.000 -0.003 66155 2016-11-12T01:48:07.817 -0.000 -0.000 -0.000 66175 2016-11-13T17:08:13.817 0.000 0.000 0.000 66197 2016-11-15T12:46:51.817 -0.001 -0.000 -0.001 66220 2016-11-17T10:28:42.817 -0.001 -0.000 0.000 66241 2016-11-19T04:13:14.817 -0.001 0.000 0.001 66255 2016-11-20T07:58:51.817 -0.001 0.000 0.001 66265 2016-11-21T03:51:05.817 -0.001 -0.000 0.001 66276 2016-11-22T01:08:51.817 -0.000 0.000 -0.000 66298 2016-11-23T20:31:51.817 -0.005 0.000 -0.005 66322 2016-11-25T20:30:51.817 0.005 0.000 -0.006 66338 2016-11-27T04:15:51.817 -0.002 0.000 0.003 66354 2016-11-28T11:52:23.816 -0.003 0.000 0.004 66374 2016-11-30T03:25:08.816 0.003 -0.000 -0.004 66390 2016-12-01T10:25:51.816 -0.003 0.000 -0.003 66407 2016-12-02T20:35:51.816 -0.002 0.000 0.003 66423 2016-12-04T04:17:51.816 -0.004 0.000 0.006 66443 2016-12-05T19:19:51.816 0.002 -0.000 0.001 66459 2016-12-07T03:28:45.816 0.002 0.000 -0.003 66470 2016-12-08T00:11:10.816 0.001 0.000 0.001 66495 2016-12-10T02:39:37.816 0.003 -0.000 -0.004 66507 2016-12-11T02:22:57.816 -0.004 -0.000 0.005 66528 2016-12-12T19:53:51.816 -0.001 -0.000 0.001 66552 2016-12-14T18:48:51.816 0.004 0.000 0.002 66567 2016-12-16T01:01:22.816 -0.000 0.000 0.000 66581 2016-12-17T04:11:16.816 -0.000 -0.000 0.000 66597 2016-12-18T11:49:46.816 0.003 -0.000 0.001 66613 2016-12-19T19:59:38.816 -0.004 0.000 0.005 66632 2016-12-21T08:57:49.816 -0.002 0.000 -0.001 66653 2016-12-23T03:04:59.816 0.000 -0.000 -0.001 66666 2016-12-24T04:10:16.816 -0.002 0.000 -0.001 66678 2016-12-25T04:13:35.816 -0.001 -0.000 0.001 66691 2016-12-26T06:12:30.816 -0.020 0.000 0.025 66702 2016-12-27T04:07:01.816 0.037 0.000 -0.045 66714 2016-12-28T03:51:11.816 -0.005 -0.000 0.006 66725 2016-12-29T00:26:51.816 0.011 0.000 0.014 66742 2016-12-30T11:03:51.816 0.021 -0.000 -0.025 66760 2016-12-31T22:39:51.816 -0.003 0.000 0.003