Who are the scientist name who discovered the magnitude of the stars?

The magnitude scale for stars, which measures their brightness, was developed by the ancient Greek astronomer Hipparchus in the 2nd century BCE. Later, the modern system of stellar magnitude was refined by astronomers such as Norman Pogson in the 19th century, who established a more precise logarithmic scale. Additionally, the work of astronomers like Johann Heinrich von Mädler and others contributed to the understanding of stellar brightness and its measurement.