Glossary term: Photometry

Description: The term photometry is derived from the Greek phōs meaning light, and metro meaning to measure. Although there are various types of photometry, the basic method involves measuring the intensity of the light (photons) radiated by various astronomical objects. The light from objects passes through specialized filters (known as passbands), and that light is captured on a digital device such as a camera CCD. The passbands cover a range of wavelengths, including infrared, visible and ultraviolet. Astronomical telescopes often have filter groups, which are called photometric systems. Some common systems include UBVRI, JHK, ugriz. Photometry allows different physical characteristics of astronomical objects to be measured, for example, temperature, color, and change in brightness.

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Term and definition status: This term and its definition is still awaiting approval

The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".