and Coordinate Systems - NASA
•A reference frame’s center must be a SPICE ephemeris object whose location is coincident with the origin (0, 0, 0) of the frame. –The center of any inertial frame is ALWAYS the solar system barycenter.* –The center of a body-fixed frame is the center of the body. »“Body” means a natural body: sun, planet, satellite, comet, asteroid.
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