Description: 测光（光度测量）一词源于希腊语 phōs，意为光，metro 意为测量。虽然测光的类型有很多种，但基本方法是测量各种天体辐射的光强度（光子）。天体发出的光会通过专门的滤光片（称为通带），然后被数码设备（如照相机 CCD）捕获。不同的通带覆盖不同的波长范围，可能包括红外线、可见光和紫外线。天文望远镜通常有滤光片组，称为测光系统。一些常见的系统包括 UBVRI、JHK 和 ugriz。通过测光可以测量天体的不同物理特性，例如温度、颜色和亮度变化。

Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher
The translation of 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".