In orbital planning, which parameter primarily defines the orientation of the orbital plane, affecting ground track geometry?

In orbital planning, which parameter primarily defines the orientation of the orbital plane, affecting ground track geometry?

• A. RAAN
• B. Orbital speed
• C. Inclination
• D. Eccentricity

Answer: (A)

The orientation of the orbital plane in space is defined by the line where the orbit crosses Earth’s equatorial plane, described by the right ascension of the ascending node. This angle fixes where that crossing line points in inertial space, which sets how the orbital plane is positioned relative to the Earth and stars. Because the ground track is the projection of that plane onto the rotating Earth, the RAAN directly shapes the longitudes at which the satellite crosses the equator and, therefore, the overall ground track geometry. The tilt of the plane, given by the inclination, determines how far north or south the track goes, influencing the latitudinal extent but not the plane’s orientation around the globe. Eccentricity and orbital speed affect the shape and timing of the path, not the plane’s orientation.