File: ICETRJDY_FMT.txt                            Version: NSSDC 12/22/98 JFC
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ICE (old ISEE-3) Predicted Heliocentric Coordinates: Daily Values for 
1984 - 1997

Data File: ICETRJA.asc

Data Parameters:

 YY DDD  RAD.AU  SECLAT  SECLON  HELLAT  HELLON  HILLON

Parameter Description:

YY = YEAR
DDD= INTEGER DAY OF YEAR (1= JAN. 1)
RAD.AU= HELIOSPHERIC RADIAL DISTANCE IN AU
SECLAT= SOLAR ECLIPTIC LATITUDE IN DEGREES
SECLON= SOLAR ECLIPTIC LONGITUDE IN DEGREES
HELLAT= SOLAR HELIOGRAPHIC LATITUDE IN DEGREES
HELLON= SOLAR HELIOGRAPHIC LONGITUDE IN DEGREES
HILLON= SOLAR HELIOGRAPHIC INERTIAL LONGITUDE IN DEGREES WITH RESPECT TO
        ASCENDING NODE OF SOLAR EQUATOR ON THE ECLIPTIC

Data Source:

These data were obtained from running the program HELICOOR in the public
directory NSSDCA::ANON_DIR:[ACTIVE.HELIO]. These data are based on
predicted trajectories calculated with the GTDS code by the NSSDC Satellite
Situation Center and converted to solar ecliptic and heliographic coordinates
by the HELIOCOOR program. The HELICOOR code was written by R. Parthasarathy.
The program GENTRJCON added the HILLON longitude.

Note that the solar ecliptic coordinates are given with respect to true
equinox and ecliptic of date. The solar ascending node was located at
ecliptic longitude +74.367 degrees as of 1 Jan. 1900 at 1200 UT; this
longitude increases by 1.4 degrees/century.