Specific angular momentum is a physical quantity that represents the angular momentum of an object per unit mass. It is commonly denoted by the symbol \( h \) or \( \mathbf{l} \), depending on the context. Specific angular momentum is useful in orbital mechanics and dynamics to analyze the motion of bodies in gravitational fields, such as planets, satellites, and spacecraft.
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The specific angular momentum is angular momentum per unit mass, . For a planar Kepler orbit its magnitude is .