: Astronomía: radial velocity

physical parameter > velocity > radial velocity

astronomical technique > astrometry > radial velocity

radial velocity

The radial velocity or line-of-sight velocity, also known as radial speed or range rate, of a target with respect to an observer is the rate of change of the distance or range between the two points. It is equivalent to the vector projection of the target-observer relative velocity onto the relative direction connecting the two points. In astronomy, the point is usually taken to be the observer on Earth, so the radial velocity then denotes the speed with which the object moves away from the Earth (or approaches it, for a negative radial velocity). (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Radial_velocity)

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