photometric calibration

Photometric calibration is the process of adjusting and standardizing the measurements of light collected by a telescope or camera so that they accurately reflect the true brightness of celestial objects. Because instruments and observing conditions vary, calibration ensures that the measured light levels are consistent and comparable across different observations. This involves comparing the instrument's readings with known reference sources (standard stars) and applying corrections. The result is reliable data that accurately represents the actual brightness and color of stars, galaxies, and other objects, enabling astronomers to analyze and compare observations effectively.