2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Nov 21 12:53:49 PST 2013 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 51215 through 52332): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2013 JUL 01 00:01:07.184 2013 OCT 01 01:01:07.182 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_od51152-51237_rec_v1.bsp spk_m_od51235-51336_rec_v1.bsp spk_m_od51334-51420_rec_v1.bsp spk_m_od51418-51496_rec_v1.bsp spk_m_od51493-51580_rec_v1.bsp spk_m_od51578-51668_rec_v1.bsp spk_m_od51666-51758_rec_v1.bsp spk_m_od51756-51850_rec_v1.bsp spk_m_od51849-51927_rec_v1.bsp spk_m_od51925-52004_rec_v1.bsp spk_m_od52002-52097_rec_v1.bsp spk_m_od52096-52182_rec_v1.bsp spk_m_od52180-52267_rec_v1.bsp spk_m_od52266-52352_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_ext36.bsp: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 51227 2013-07-02T02:04:52.815 0.005 -0.000 -0.005 51234 2013-07-02T17:00:52.815 -0.002 0.000 -0.002 51247 2013-07-03T17:33:52.815 0.001 -0.000 -0.001 51260 2013-07-04T19:03:52.815 0.004 0.000 -0.003 51275 2013-07-06T00:50:52.816 -0.004 0.000 0.004 51285 2013-07-06T20:35:52.816 -0.002 0.000 0.001 51298 2013-07-07T21:56:52.816 0.003 0.000 -0.002 51315 2013-07-09T07:48:52.816 -0.001 0.000 0.001 51333 2013-07-10T20:10:52.816 -0.003 -0.000 -0.003 51346 2013-07-11T22:23:52.816 -0.002 0.000 -0.001 51365 2013-07-13T10:32:52.816 -0.002 -0.000 0.002 51381 2013-07-14T18:08:52.816 0.001 0.000 -0.001 51395 2013-07-15T21:19:52.816 0.006 0.000 -0.001 51407 2013-07-16T22:56:52.816 0.001 -0.000 -0.000 51417 2013-07-17T18:01:52.816 -0.004 0.000 -0.003 51429 2013-07-18T18:18:52.816 0.002 -0.000 0.001 51441 2013-07-19T16:37:52.816 -0.002 -0.000 0.002 51459 2013-07-21T05:33:52.816 -0.000 -0.000 -0.000 51479 2013-07-22T19:39:52.816 0.003 -0.000 -0.003 51492 2013-07-23T22:06:52.816 0.005 0.000 0.004 51513 2013-07-25T14:23:52.816 -0.004 0.000 0.001 51531 2013-07-27T03:42:52.816 0.002 -0.000 0.001 51551 2013-07-28T17:49:52.816 -0.001 0.000 0.001 51565 2013-07-29T21:21:52.816 -0.003 0.000 0.003 51577 2013-07-30T21:59:52.816 0.004 -0.000 0.004 51594 2013-08-01T06:44:52.816 0.004 -0.000 -0.004 51607 2013-08-02T08:24:52.816 -0.002 -0.000 0.002 51624 2013-08-03T17:59:52.816 -0.003 -0.000 0.003 51638 2013-08-04T21:37:52.816 0.001 0.000 -0.001 51648 2013-08-05T17:22:52.816 0.004 0.000 -0.004 51665 2013-08-07T04:26:52.816 0.003 -0.000 -0.000 51685 2013-08-08T18:13:52.816 -0.000 -0.000 0.000 51704 2013-08-10T07:56:52.816 -0.000 -0.000 0.001 51721 2013-08-11T17:30:52.816 0.002 0.000 -0.002 51734 2013-08-12T19:00:52.817 -0.001 0.000 0.001 51745 2013-08-13T16:53:52.817 -0.002 0.000 0.002 51755 2013-08-14T13:27:52.817 -0.001 0.000 -0.001 51782 2013-08-16T17:56:52.817 -0.001 -0.000 0.001 51801 2013-08-18T07:28:52.817 0.000 -0.000 -0.000 51816 2013-08-19T14:25:52.817 0.002 0.000 0.001 51829 2013-08-20T14:23:52.817 -0.001 0.000 0.001 51848 2013-08-22T05:07:52.817 0.003 0.000 0.003 51866 2013-08-23T15:48:52.817 0.003 -0.000 -0.003 51878 2013-08-24T16:48:52.817 -0.001 0.000 -0.001 51894 2013-08-25T23:06:52.817 -0.000 0.000 0.000 51909 2013-08-27T04:44:52.817 0.000 -0.000 -0.000 51924 2013-08-28T11:46:52.817 -0.002 -0.000 -0.000 51942 2013-08-29T21:52:52.817 0.002 0.000 -0.002 51959 2013-08-31T07:26:52.817 -0.002 -0.000 0.003 51975 2013-09-01T15:01:52.817 0.003 -0.000 -0.004 51990 2013-09-02T20:39:52.817 0.005 0.000 -0.005 52001 2013-09-03T19:14:52.817 -0.002 0.000 -0.002 52020 2013-09-05T07:55:52.817 0.005 0.000 -0.006 52037 2013-09-06T18:35:52.817 0.006 0.000 0.006 52056 2013-09-08T07:00:52.817 -0.005 -0.000 0.006 52075 2013-09-09T21:44:52.817 -0.006 0.000 -0.006 52095 2013-09-11T13:29:52.817 -0.000 0.000 -0.000 52108 2013-09-12T14:40:52.817 -0.001 0.000 -0.001 52122 2013-09-13T17:17:52.817 0.005 0.000 -0.006 52134 2013-09-14T17:02:52.817 0.003 0.000 -0.004 52147 2013-09-15T18:35:52.817 -0.007 -0.000 0.007 52161 2013-09-16T22:20:52.817 -0.001 0.000 0.001 52179 2013-09-18T11:29:52.817 0.006 0.000 -0.002 52197 2013-09-19T21:25:52.817 0.002 -0.000 -0.002 52214 2013-09-21T06:59:52.817 0.000 0.000 -0.001 52233 2013-09-22T20:30:52.817 -0.000 0.000 0.000 52249 2013-09-24T05:26:52.817 -0.003 0.000 -0.002 52265 2013-09-25T11:25:52.817 -0.001 -0.000 0.001 52279 2013-09-26T15:21:52.817 -0.002 -0.000 0.003 52299 2013-09-28T06:51:52.817 0.005 0.000 -0.007 52316 2013-09-29T16:13:52.817 -0.005 -0.000 0.005 52327 2013-09-30T14:09:52.817 0.003 -0.000 -0.004