For two bodies, the parameter may be expressed as G(m1 + m2), or as GM when one body is much larger than the other: For several objects in the Solar System, the value of μ is known to greater accuracy than either G or M. The SI unit of the standard gravitational parameter is m 3⋅ s −2.. The standard gravitational parameter μ of a celestial body is the product of the gravitational constant G and the mass M of that body.
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