Examples
Examples
Try the starting example
- Observed wavelength (nm)
- 660
- Rest wavelength (nm)
- 656.28
- Redshift z
- 0.005668
- Observed/rest wavelength ratio
- 1.005668
- Special-relativistic radial Doppler equivalent (km/s)
- 1,694.501225
Try another scenario
- Observed wavelength (nm)
- 726.0000000000001
- Rest wavelength (nm)
- 656.28
- Redshift z
- 0.106235
- Observed/rest wavelength ratio
- 1.106235
- Special-relativistic radial Doppler equivalent (km/s)
- 30,165.365811
Calculation method
Calculation method
Redshift z
z=lambdaObs/lambdaRest-1; beta=((1+z)²-1)/((1+z)²+1).
Observed/rest wavelength ratio
z=lambdaObs/lambdaRest-1; beta=((1+z)²-1)/((1+z)²+1).
Special-relativistic radial Doppler equivalent (km/s)
z=lambdaObs/lambdaRest-1; beta=((1+z)²-1)/((1+z)²+1).
Symbols and units
- a
- Observed wavelength (nm)
- b
- Rest wavelength (nm)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Radial Doppler equivalent in vacuum; not a cosmological recession-distance estimate. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Radial Doppler equivalent in vacuum; not a cosmological recession-distance estimate.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.