Radial Velocity precision Calculator

Input the values of your object in interest and check for the optimum wavelength for which to measure Radial Velocities RV.
Description of the values given by hovering with the mouse over each value. Scroll to the bottom to see how the page reacts
to your input.

Firstly, select which type of query you want. If not 'Set Manually', querying simbad!

Query selection

Set Manually
Identifier
Coordinates
From file

Teff = K
=
ϕ = m
SNR =
R =
τobs = min
Optional: Set wavelength range
λmin =
λmax =

λmin
[nm]		 λmax
[nm]		 RV precision
[m/s]

Changing Teff or R will lead to (re-)plotting, while changing Vmag, ϕ, SNR will modify τobs. Finally, changing τobs will recalculate SNR. If you wish to get a radial velocity precision for a certain wavelength range, please set it using λmin and λmax. It is possible to switch between J- and V-magnitude and doing so will refresh the SNR using the given J- resp. V-magnitude. Changes to single parameters may be applied by pressing <Enter>. For now, please only change one parameter at a time before (re-)plotting.