2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Feb 2 13:51:14 PST 2023 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 92249 through 93365): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2022 OCT 01 00:01:09.182 2023 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_od92224-92312_rec_v1.bsp spk_m_od92310-92390_rec_v1.bsp spk_m_od92389-92483_rec_v1.bsp spk_m_od92481-92568_rec_v1.bsp spk_m_od92566-92652_rec_v1.bsp spk_m_od92650-92736_rec_v1.bsp spk_m_od92734-92819_rec_v1.bsp spk_m_od92817-92896_rec_v1.bsp spk_m_od92894-92995_rec_v1.bsp spk_m_od92993-93083_rec_v1.bsp spk_m_od93081-93162_rec_v1.bsp spk_m_od93159-93238_rec_v1.bsp spk_m_od93237-93335_rec_v1.bsp spk_m_od93331-93417_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_ext73.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 92253 2022-10-01T10:42:50.817 0.000 0.000 0.000 92268 2022-10-02T15:16:50.817 0.001 0.000 -0.001 92285 2022-10-04T00:50:50.817 0.001 0.000 -0.001 92302 2022-10-05T10:27:50.817 -0.007 0.000 0.006 92310 2022-10-06T03:01:50.817 0.009 0.000 0.007 92326 2022-10-07T09:53:50.817 0.002 -0.000 -0.002 92337 2022-10-08T08:41:50.817 -0.000 -0.000 -0.000 92350 2022-10-09T10:36:50.817 -0.001 -0.000 -0.000 92362 2022-10-10T08:55:50.817 0.001 -0.000 -0.000 92375 2022-10-11T10:33:50.817 -0.004 0.000 0.003 92389 2022-10-12T15:07:50.817 -0.004 -0.000 -0.003 92410 2022-10-14T07:54:50.817 0.003 -0.000 -0.002 92423 2022-10-15T09:36:50.817 0.003 -0.000 -0.002 92437 2022-10-16T14:38:50.817 -0.005 -0.000 -0.000 92448 2022-10-17T12:16:50.817 0.001 0.000 0.000 92470 2022-10-19T06:29:50.817 0.001 -0.000 -0.001 92481 2022-10-20T05:32:50.817 -0.006 -0.000 -0.001 92496 2022-10-21T09:29:50.817 -0.007 -0.000 0.003 92509 2022-10-22T11:24:50.817 0.001 0.000 -0.000 92520 2022-10-23T09:20:50.817 -0.003 -0.000 0.002 92535 2022-10-24T14:38:50.817 -0.006 0.000 0.004 92556 2022-10-26T08:27:50.817 0.017 -0.000 -0.011 92566 2022-10-27T05:17:50.817 0.009 0.000 0.005 92580 2022-10-28T07:54:50.817 -0.002 -0.000 0.001 92601 2022-10-30T01:26:50.817 -0.017 0.000 0.010 92614 2022-10-31T03:07:50.817 0.010 -0.000 -0.006 92627 2022-11-01T04:42:50.817 -0.006 -0.000 0.004 92642 2022-11-02T11:39:50.817 -0.001 -0.000 -0.000 92650 2022-11-03T02:49:50.817 0.016 -0.000 0.007 92662 2022-11-04T01:49:50.817 0.014 0.000 -0.009 92677 2022-11-05T07:40:50.817 -0.010 0.001 0.004 92687 2022-11-06T02:57:50.817 0.018 0.000 -0.007 92705 2022-11-07T15:02:50.817 -0.013 0.000 0.005 92717 2022-11-08T14:49:50.817 0.002 -0.000 -0.001 92734 2022-11-10T01:16:50.817 -0.002 0.000 -0.001 92750 2022-11-11T08:43:50.817 0.017 0.001 0.009 92762 2022-11-12T08:38:50.817 0.014 0.001 0.006 92782 2022-11-13T22:38:50.817 -0.002 -0.000 0.000 92808 2022-11-16T02:38:50.817 -0.002 -0.000 0.001 92817 2022-11-16T19:46:50.817 -0.008 -0.001 0.001 92833 2022-11-18T04:02:50.817 0.001 0.000 -0.001 92846 2022-11-19T05:18:50.817 -0.036 0.000 0.012 92861 2022-11-20T11:38:50.817 -0.017 0.000 -0.000 92870 2022-11-21T05:24:50.817 0.009 -0.001 -0.000 92886 2022-11-22T13:38:50.817 0.015 0.001 0.005 92894 2022-11-23T04:26:50.817 -0.032 -0.001 0.010 92906 2022-11-24T04:53:50.817 -0.048 -0.000 -0.012 92920 2022-11-25T07:43:50.817 -0.005 -0.000 0.001 92932 2022-11-26T07:08:50.817 -0.052 -0.001 0.007 92941 2022-11-27T00:53:50.817 0.040 -0.001 -0.003 92958 2022-11-28T12:02:50.816 0.061 -0.000 0.013 92973 2022-11-29T17:38:50.816 -0.036 -0.001 -0.008 92983 2022-11-30T12:23:50.816 -0.082 0.001 0.019 92993 2022-12-01T07:36:50.816 0.053 0.000 -0.000 93008 2022-12-02T14:17:50.816 -0.063 -0.000 -0.003 93028 2022-12-04T05:10:50.816 -0.055 0.001 0.010 93040 2022-12-05T06:08:50.816 -0.138 0.001 -0.024 93053 2022-12-06T06:02:50.816 0.172 0.001 0.020 93061 2022-12-06T22:33:50.816 -0.037 -0.002 0.006 93081 2022-12-08T15:01:50.816 0.043 -0.000 0.007 93094 2022-12-09T16:08:50.816 -0.075 0.000 0.008 93125 2022-12-12T04:18:50.816 -0.069 -0.001 -0.011 93138 2022-12-13T06:13:50.816 0.188 0.002 0.020 93151 2022-12-14T08:23:50.816 -0.122 0.002 0.014 93159 2022-12-15T01:11:50.816 -0.001 -0.000 -0.000 93177 2022-12-16T11:43:50.816 0.199 -0.001 -0.016 93191 2022-12-17T16:32:50.816 -0.346 -0.004 -0.048 93214 2022-12-19T12:29:50.816 0.077 0.001 0.012 93222 2022-12-20T04:39:50.816 -0.043 0.000 0.002 93237 2022-12-21T09:36:50.816 -0.066 -0.002 -0.012 93259 2022-12-23T06:37:50.816 -0.085 -0.001 0.007 93271 2022-12-24T05:02:50.816 0.004 -0.000 0.001 93288 2022-12-25T15:50:50.816 -0.039 0.000 0.007 93298 2022-12-26T11:59:50.816 0.057 0.000 0.006 93308 2022-12-27T07:18:50.816 -0.040 0.000 0.009 93321 2022-12-28T08:52:50.816 0.089 -0.000 -0.025 93331 2022-12-29T04:17:50.816 -0.008 -0.000 0.001 93347 2022-12-30T11:39:50.816 0.022 -0.000 0.002 93359 2022-12-31T10:52:50.816 0.003 0.000 0.001