To determine the orbital period of a visual binary, we must measure

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To determine the orbital period of a visual binary, we must measure the positions of the two stars over time and plot their relative motion on the sky. By observing the stars repeatedly over a long enough period, we can determine the time it takes for them to complete one orbit around their common center of mass. Measuring brightness, wavelengths, luminosity, and temperature may provide additional information about the stars, but they are not directly relevant to determining their orbital period in a visual binary system.

To Determine the Orbital Period of a Visual Binary, We