Cynthia Vaskis

SLM521 Spring 2004

Dropin #3 Assignment

4/6/04

File: dp3stvcn.htm

The Space Object’s State Vector’s definition in ECI coordinates can be calculated from the Euler orbital parameters. The State Vector STATE(x,y,z) which points to the Space Object’s coordinate system origin can be added to the Star Tracker’s Translation Vector to get a new Earth to Tracker E2T vector from the ECI origin of the Earth directly to the Star Tracker’s origin.

A new Earth to Tracker vector E2T(x,y,z) in ECI coordinates

Star Tracker’s Translation Vector from Space Object’s origin to Star Tracker’s origin

STATE Vector from center of Earth to Space Object’s origin of its Cartesian coordinate system

Space Object (blown up to show its Cartesian coordinate system origin)

Earth with ECI Cartesian coordinate system

Star 2