 
 
2001 Mars Odyssey Mapping SPK file, M01 NAV Solution
===========================================================================
 
     Created by Boris Semenov, NAIF/JPL, September 19, 2002
 
 
Objects in the Ephemeris
--------------------------------------------------------
 
     This file contains ephemeris data for 2001 Mars Odyssey (M01)
     spacecraft. NAIF ID code for M01 is -53.
 
 
Approximate Time Coverage
--------------------------------------------------------
 
     This file covers the following part of the Mapping phase of the M01
     mission:
 
        COVERAGE BEGIN TIME (TDB):   2002 APR 01 00:00:00.000
        COVERAGE END TIME (TDB):     2002 JUL 01 01:00:00.000
 
 
Status
--------------------------------------------------------
 
     This file was created by merging regular reconstructed OD solution SPK
     files produced by M01 NAV during Mapping phase of the mission. The
     file was created by NAIF for archiving with 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 (FIS/DOM) by M01 NAV. The list of the original files
     data from which has been merged into this file is provided in the
     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 coverage immediately precede and follow
     it. The times and magnitudes of these discontinuities are provided in
     the Appendix 2 of these comments.
 
 
Usage
--------------------------------------------------------
 
     This file should be used together with DE405 planetary 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,
        bsemenov@spice.jpl.nasa.gov
 
     or M01 NAV Team Lead:
 
        Robert A. Mase
        (818)-354-8990
        Robert.A.Mase@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_od01267-01360_rec_v1.bsp
        spk_m_od01360-01446_rec_v1.bsp
        spk_m_od01446-01525_rec_v1.bsp
        spk_m_od01525-01616_rec_v1.bsp
        spk_m_od01616-01686_rec_v1.bsp
        spk_m_od01686-01776_rec_v1.bsp
        spk_m_od01777-01870_rec_v1.bsp
        spk_m_od01871-01959_rec_v1.bsp
        spk_m_od01959-02040_rec_v1.bsp
        spk_m_od02041-02121_rec_v1.bsp
        spk_m_od02120-02196_rec_v1.bsp
        spk_m_od02196-02286_rec_v1.bsp
        spk_m_od02287-02381_rec_v1.bsp
        spk_m_od02381-02445_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_map2.bsp:
        #
        #ORBNUM    BOUNDARY TIME (UTC)   DOWNTRK INPLANE  NORMAL
        #------- ----------------------- ------- ------- -------
        1314     2002-04-01T17:18:55.814   0.010  -0.000   0.001
        1338     2002-04-03T17:48:55.814  -0.015   0.000  -0.001
        1359     2002-04-05T11:58:55.814   0.009  -0.000   0.003
        1378     2002-04-06T23:58:55.814   0.012   0.000  -0.003
        1403     2002-04-09T01:58:55.814   0.005  -0.000  -0.001
        1425     2002-04-10T21:28:55.814  -0.009   0.000   0.002
        1446     2002-04-12T13:58:55.814   0.006   0.000   0.001
        1466     2002-04-14T05:28:55.814  -0.001  -0.000  -0.000
        1490     2002-04-16T05:28:55.814   0.003  -0.000  -0.001
        1508     2002-04-17T17:58:55.814   0.001   0.000   0.000
        1524     2002-04-19T01:28:55.814  -0.005   0.000  -0.001
        1537     2002-04-20T03:28:55.814  -0.004   0.000  -0.002
        1553     2002-04-21T10:58:55.814   0.008  -0.000   0.004
        1556     2002-04-21T16:58:55.814  -0.005  -0.000  -0.003
        1576     2002-04-23T07:18:55.814   0.001  -0.000  -0.001
        1594     2002-04-24T19:58:55.814  -0.012  -0.000  -0.005
        1615     2002-04-26T12:38:55.814   0.014  -0.000  -0.005
        1638     2002-04-28T09:28:55.814   0.001   0.000  -0.000
        1662     2002-04-30T08:48:55.814   0.006   0.000   0.000
        1685     2002-05-02T07:58:55.814  -0.004   0.000  -0.001
        1706     2002-05-04T01:28:55.814  -0.001   0.000  -0.000
        1728     2002-05-05T20:18:55.814   0.001  -0.000   0.000
        1753     2002-05-07T22:18:55.814   0.003  -0.000   0.001
        1776     2002-05-09T18:43:55.814   0.001  -0.000  -0.001
        1799     2002-05-11T16:53:55.814  -0.002   0.000  -0.001
        1822     2002-05-13T14:43:55.814   0.003   0.000   0.001
        1846     2002-05-15T13:58:55.814   0.004  -0.000   0.001
        1870     2002-05-17T11:58:55.814  -0.003  -0.000   0.001
        1893     2002-05-19T09:58:55.814   0.005  -0.000  -0.001
        1919     2002-05-21T13:43:55.814   0.004  -0.000   0.001
        1939     2002-05-23T05:43:55.814  -0.001   0.000  -0.000
        1958     2002-05-24T18:43:55.814  -0.004   0.000  -0.001
        1979     2002-05-26T11:43:55.814   0.006  -0.000  -0.002
        2003     2002-05-28T11:43:55.815  -0.009   0.000  -0.003
        2024     2002-05-30T05:43:55.815  -0.000   0.000  -0.000
        2040     2002-05-31T12:43:55.815   0.003   0.000   0.001
        2046     2002-05-31T23:58:55.815   0.000   0.000   0.000
        2063     2002-06-02T10:43:55.815  -0.000   0.000  -0.000
        2083     2002-06-04T01:18:55.815   0.009   0.000  -0.001
        2097     2002-06-05T04:18:55.815  -0.001   0.001   0.000
        2119     2002-06-07T01:28:55.815  -0.013   0.000  -0.001
        2138     2002-06-08T14:58:55.815  -0.012  -0.000  -0.001
        2155     2002-06-10T00:38:55.815  -0.003  -0.000  -0.000
        2175     2002-06-11T16:08:55.815  -0.006  -0.000  -0.000
        2195     2002-06-13T07:28:55.815   0.008  -0.000   0.002
        2217     2002-06-15T01:28:55.815  -0.002  -0.000   0.001
        2240     2002-06-16T23:28:55.815   0.002  -0.000  -0.000
        2261     2002-06-18T17:28:55.815   0.003   0.000   0.001
        2286     2002-06-20T17:33:55.815  -0.006  -0.000   0.001
        2309     2002-06-22T15:28:55.815  -0.016   0.000   0.006
        2333     2002-06-24T14:28:55.815   0.026  -0.000  -0.004
        2357     2002-06-26T14:38:55.815   0.006  -0.000   0.000
        2380     2002-06-28T12:58:55.815   0.002   0.000   0.000
 
 
