semi-major axis
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semi-major axis
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Half the longest distance (major axis) across an ellipse. The semi-major axis is one of the orbital elements – a standard parameter used to describe an elliptical orbit. The semimajor axis is also the average distance of an orbiting object from its primary. The periapsis and apoapsis distances, rp and ra, can be calculated from the semimajor axis, a, and the eccentricity, e, by the formula
rp = a(1 - e) and ra = a(1 + e)
Related category
• CELESTIAL MECHANICS
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