The Galaxy Recession Velocity calculator computes the velocity of a galaxy away from Earth based on the redshift and the speed of light.
INSTRUCTIONS: Enter the following:
Recession Velocity (V): The calculator returns the velocity in kilometers per second. However, this can be automatically converted to compatible units via the pull-down menu.
Red Shift is used to compute the recession velocity of a galaxy. The formula for the recession velocity of a galaxy is:
`V = z*C`
A source of light moving toward or away from an observer will have it's spectrum shifted toward the blue (moving toward) or to the red (moving away). This formula gives the magnitude of the wavelength shift given the speed of the source relative to the observer (for speeds well below the speed of light only!).
The formula for Redshift is:
z = (λv - λ0) / λ0
The Astronomy Calculator Suite includes functions that are useful for studying astronomy and include the following:
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