“Oort’s constants”的概念、定义、翻译、参考文献-科学参考

Oort’s constants

Astronomy

Two parameters defined by J. H. Oort to describe the major features of our Galaxy’s differential rotation in the Sun’s neighbourhood. They are usually expressed in units of kilometres per second per kiloparsec. The two parameters are given the symbols A and B. Values derived from Hipparcos proper motions are A = 14.82 km/s/kpc and B = −12.37 km/s/kpc. Subtracting B from A gives the angular velocity of the local standard of rest around the centre of the Galaxy, which corresponds to a period of about 200 million years.

单词	Oort’s constants
释义	Oort’s constants Astronomy Two parameters defined by J. H. Oort to describe the major features of our Galaxy’s differential rotation in the Sun’s neighbourhood. They are usually expressed in units of kilometres per second per kiloparsec. The two parameters are given the symbols A and B. Values derived from Hipparcos proper motions are A = 14.82 km/s/kpc and B = −12.37 km/s/kpc. Subtracting B from A gives the angular velocity of the local standard of rest around the centre of the Galaxy, which corresponds to a period of about 200 million years.
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