• Data Set Overview
• =================

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 COordinates 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° as of January 1, 1900 at 1200 UT. This Longitude increases by 1.4° per Century.

• Data Formats
• ============

Field Description

1. Date YYYY DDD.DD where YY=Year and DDD.DD=Decimal Day
2. Range Heliocentric Range in AU
3. SE_Lat Solar Ecliptic Latitude in Degrees
4. SE_Lon Solar Ecliptic Longitude in Degrees
5. HG_Lat Heliographic Latitude in Degrees
6. HG_Lon Heliographic Longitude in Degrees
7. IHG_Lon Inertial Heliographic Longitude in Degrees with respect to the Ascending Node of the Solar Equator in the Ecliptic.

• Contact Information
• ===================

• R. P. (Sardi) Parthasarathy
• Hughes STX Corporation / Space Physics Data Facility
• NASA Goddard Space Flight Center
• Greenbelt, Maryland
• sardi@nssdca.gsfc.nasa.gov
• Phone: (301) 286-8105

• Acknowledgement
• ===============

Use of these Data in Publications should be accompanied at minimum by Acknowledgements of the National Space Science Data Center and the responsible Principal Investigator defined in the Experiment Documentation provided here.