ODM2 Units Type Controlled Vocabulary ODM2 Working Group A vocabulary for describing the type of the Unit or the more general quantity that the Unit represents. Standard gravitational parameter In celestial mechanics, the standard gravitational parameter ? of a celestial body is the product of the gravitational constant G and the mass M of the body. [Wikipedia: https://en.wikipedia.org/wiki/Standard_gravitational_parameter] Mechanics QUDT http://qudt.org/vocab/quantity#StandardGravitationalParameter <http://dbpedia.org/resource/Standard_gravitational_parameter>