2001 Mars Odyssey Extended Phase SPK, M01 NAV Solution =========================================================================== Created by Boris Semenov, NAIF/JPL, Thu Jan 28 08:12:33 PST 2021 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 83383 through 84499): Start of Interval (ET) End of Interval (ET) -------------------------------- -------------------------------- 2020 OCT 01 00:01:09.182 2021 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_od83287-83389_rec_v1.bsp spk_m_od83387-83477_rec_v1.bsp spk_m_od83473-83551_rec_v1.bsp spk_m_od83548-83643_rec_v1.bsp spk_m_od83641-83711_rec_v1.bsp spk_m_od83709-83808_rec_v1.bsp spk_m_od83806-83894_rec_v1.bsp spk_m_od83892-83966_rec_v1.bsp spk_m_od83965-84057_rec_v1.bsp spk_m_od84057-84151_rec_v1.bsp spk_m_od84151-84237_rec_v1.bsp spk_m_od84236-84321_rec_v1.bsp spk_m_od84316-84391_rec_v1.bsp spk_m_od84390-84479_rec_v1.bsp spk_m_od84478-84579_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_ext65.bsp, km: # #ORBNUM BOUNDARY TIME (UTC) DOWNTRK INPLANE NORMAL #------- ----------------------- ------- ------- ------- 83387 2020-10-01T10:26:50.817 -0.014 -0.000 -0.006 83400 2020-10-02T10:51:50.817 -0.031 0.000 0.006 83410 2020-10-03T06:21:50.817 0.029 -0.000 0.005 83425 2020-10-04T13:41:50.817 -0.014 0.000 -0.006 83438 2020-10-05T13:37:50.817 0.017 -0.000 0.004 83450 2020-10-06T13:32:50.817 -0.001 0.001 0.002 83462 2020-10-07T13:27:50.817 -0.025 0.002 0.006 83473 2020-10-08T12:30:50.817 0.011 -0.000 0.005 83486 2020-10-09T13:17:50.817 -0.064 0.001 0.026 83506 2020-10-11T05:36:50.817 0.021 -0.000 0.008 83522 2020-10-12T13:00:50.817 -0.034 -0.000 -0.005 83534 2020-10-13T12:51:50.817 -0.001 -0.001 -0.000 83542 2020-10-14T04:19:50.817 0.003 0.000 -0.000 83548 2020-10-14T16:29:50.817 -0.036 -0.000 -0.008 83586 2020-10-17T18:14:50.817 -0.011 -0.000 -0.004 83595 2020-10-18T13:32:50.817 0.005 -0.000 0.002 83606 2020-10-19T09:50:50.817 0.022 0.001 0.005 83621 2020-10-20T16:14:50.817 0.026 -0.000 -0.011 83641 2020-10-22T06:45:50.817 -0.068 -0.000 -0.032 83655 2020-10-23T12:01:50.817 0.012 -0.000 0.004 83665 2020-10-24T06:18:50.817 -0.032 -0.000 -0.013 83676 2020-10-25T03:56:50.817 -0.018 -0.000 -0.009 83687 2020-10-26T02:39:50.817 -0.081 0.001 0.040 83709 2020-10-27T22:45:50.817 -0.004 0.001 -0.001 83739 2020-10-30T08:55:50.817 0.035 0.000 -0.003 83755 2020-10-31T16:59:50.817 -0.017 0.000 0.010 83767 2020-11-01T16:57:50.817 -0.013 0.000 0.005 83779 2020-11-02T16:35:50.817 0.059 -0.000 -0.030 83791 2020-11-03T16:13:50.817 -0.036 0.000 0.021 83806 2020-11-04T22:31:50.817 -0.005 -0.000 -0.002 83822 2020-11-06T05:36:50.817 -0.052 0.000 0.027 83837 2020-11-07T10:43:50.817 0.037 -0.000 -0.011 83864 2020-11-09T15:38:50.817 0.009 -0.000 0.005 83869 2020-11-10T02:18:50.817 -0.017 0.000 0.011 83883 2020-11-11T06:08:50.817 0.021 -0.000 -0.012 83892 2020-11-12T00:32:50.817 -0.002 0.000 -0.001 83908 2020-11-13T07:32:50.817 -0.015 0.000 0.009 83924 2020-11-14T14:43:50.817 0.013 -0.000 -0.005 83949 2020-11-16T15:57:50.817 -0.010 0.000 0.001 83965 2020-11-17T23:46:50.817 0.022 0.000 -0.011 83982 2020-11-19T09:23:50.817 0.013 -0.000 -0.007 83994 2020-11-20T09:27:50.817 0.009 0.000 -0.007 84006 2020-11-21T08:59:50.817 -0.012 0.000 0.009 84021 2020-11-22T14:47:50.817 -0.007 0.000 0.005 84043 2020-11-24T09:49:50.817 0.026 -0.000 -0.008 84057 2020-11-25T12:40:50.817 -0.016 -0.000 -0.010 84079 2020-11-27T09:23:50.816 -0.010 0.000 0.008 84094 2020-11-28T15:01:50.816 0.018 -0.000 -0.014 84106 2020-11-29T14:39:50.816 -0.011 0.000 0.009 84130 2020-12-01T14:09:50.816 0.012 -0.000 -0.010 84151 2020-12-03T06:27:50.816 -0.000 0.000 -0.000 84166 2020-12-04T13:18:50.816 0.002 -0.000 -0.002 84191 2020-12-06T14:41:50.816 -0.004 -0.000 0.004 84212 2020-12-08T08:09:50.816 -0.004 0.000 0.004 84223 2020-12-09T05:54:50.816 0.005 -0.000 -0.004 84236 2020-12-10T06:26:50.816 -0.001 -0.000 -0.001 84257 2020-12-12T01:08:50.816 -0.008 -0.000 0.007 84269 2020-12-13T00:50:50.816 0.001 0.000 -0.001 84282 2020-12-14T02:32:50.816 0.006 0.000 -0.005 84297 2020-12-15T08:09:50.816 0.002 -0.000 -0.001 84316 2020-12-16T21:08:50.816 -0.000 0.000 0.000 84334 2020-12-18T08:41:50.816 -0.007 0.000 -0.001 84354 2020-12-20T00:48:50.816 0.009 -0.000 -0.008 84370 2020-12-21T08:23:50.816 -0.011 0.000 0.010 84390 2020-12-22T23:28:50.816 0.012 -0.000 -0.002 84403 2020-12-24T01:01:50.816 -0.001 0.000 -0.000 84417 2020-12-25T05:19:50.816 0.004 -0.000 -0.004 84433 2020-12-26T12:12:50.816 -0.008 0.000 -0.004 84443 2020-12-27T08:20:50.816 -0.013 0.000 0.007 84451 2020-12-28T00:25:50.816 0.015 -0.000 -0.014 84478 2020-12-30T04:59:50.816 -0.004 -0.000 -0.003 84494 2020-12-31T13:15:50.816 -0.010 0.000 0.008