radial velocity

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radial velocity

radial velocity in astronomy, the speed with which a star moves toward or away from the sun. It is determined from the red or blue shift in the star's spectrum .

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radial velocity

A Dictionary of Astronomy | 1997 | Â© A Dictionary of Astronomy 1997, originally published by Oxford University Press 1997. (Hide copyright information) Copyright

radial velocity A measure of the velocity of an astronomical object along the observer's line of sight. The radial velocity is determined by comparing the wavelengths of lines in the object's spectrum with their laboratory values, the differences being due to the Doppler shift. Corrections are usually applied for the Earth's rotation on its axis and its orbital motion around the Sun. By convention, velocities away from us (redshifts) are positive; those towards us (blueshifts), negative. See also redshift.

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