Photometric standards

Photometric standards are precisely measured reference objects or sources used by astronomers to calibrate their observations of stars, planets, and other celestial bodies. By observing these standards under consistent conditions, astronomers can accurately determine the brightness and color of other objects in the sky. This process ensures that measurements from different telescopes and times are comparable, enabling reliable scientific analysis. In essence, photometric standards serve as a universal "yardstick" for measuring the light emitted or reflected by celestial objects, facilitating consistency and accuracy in astronomical research.