Radial Velocity
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radial velocity is the velocity of an object in the direction of the line of sight (i.e. its speed straight towards or away from an observer). The light of an object with a substantial radial velocity will be subject to Doppler effect, so the frequency of the light decreases for receding objects (redshift) and increases for approaching objects (blueshift). The radial velocity of a star or other luminous but distant objects can be measured accurately by taking a high-r...
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Radial velocity is the velocity of an object in the direction of the line of sight (i.e. its speed straight towards or away from an observer). The light of an object with a substantial radial velocity will be subject to Doppler effect, so the frequency of the light decreases for receding objects (redshift) and increases for approaching objects (blueshift). The radial velocity of a star or other luminous but distant objects can be measured accurately by taking a high-resolution spectrum and comparing the measured wavelengths of known spectral lines to wavelengths from laboratory measurements. By convention, a positive radial velocity indicates the object is receding; if the sign is negative, then the object is approaching.
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