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STEREO-A Ephemeris in the HCI Coordinate System

Published by AttitudeOrbit | National Aeronautics and Space Administration | Catalog Last Checked: August 18, 2026 at 11:59 PM | Dataset Last Updated: August 18, 2026
STEREO atttitude and orbit data are distributed as SPICE kernels. Since most SEP investigators would rather not deal with SPICE kernels, Caltech provides text files containing position data for the two STEREO spacecraft, in the following coordinate systems: GEI, GSE, GSM, HCI, HEE, HEEQ.

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