Path: SC/Ephem
% Interpolate a planet's state for a given Julian Date.
Uses the JPL ephemeris files. The returned state is measured from the solar
system barycenter and in the Earth equatorial frame. Can be initialized with
the binary file name by passing empty for the other inputs, then future calls
may omit the file name. The initialization status can be checked with a single
empty input.
A binary file can be generated from a text file (ex. ascp2000.405)
using the tool EphemUtil, available via ftp:
ftp://ssd.jpl.nasa.gov//pub/eph/export/
in the folder C-versions/hoffman. You must compile the tool for your
system.
Visit http://ssd.jpl.nasa.gov/?planet_eph_export for more information
about these ephemerides.
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Form:
[X, GM] = InterpolateState( target, time, fileName )
status = InterpolateState( [], [], fileName )
status = InterpolateState( [] )
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1. Mercury
2. Venus
3. Earth-Moon Barycenter
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune
9. Pluto
10. Geocentric Moon
11. Sun
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Inputs
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Target (1,1) Planet ID
Time (1,1) Julian date (days)
fileName (:) Binary file name if not initialized
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Outputs
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X (6,1) Planetary state vector, Earth mean equatorial frame
GM (1,1) Corresponding gravitational parameter (km3/s2)
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SC: SCData/bin2000 Common: Time/DTSToDTA Common: Time/Date2JD Common: Time/JD2000
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