Back Bahnelement ALS عناصر مدارية Arabic Elementos orbitales AST Элементы арбіты Byelorussian কক্ষপথের রাশি Bengali/Bangla Elements orbitals Catalan Elementy dráhy Czech Baneparameter Danish Bahnelement German Τροχιακά στοιχεία Greek
Orbital elements are the parameters required to uniquely identify a specific orbit. In celestial mechanics these elements are considered in two-body systems using a Kepler orbit. There are many different ways to mathematically describe the same orbit, but certain schemes, each consisting of a set of six parameters, are commonly used in astronomy and orbital mechanics.
A real orbit and its elements change over time due to gravitational perturbations by other objects and the effects of general relativity. A Kepler orbit is an idealized, mathematical approximation of the orbit at a particular time.