Photometry is the scientific measurement and study of light, particularly the visible light that we can see. It involves analyzing and quantifying the intensity, brightness, and color of light emitted or reflected by objects. Full definition
With high precision photometry of transiting planets and high precision Gaia parallaxes, the parallactic mass and radius uncertainties of stars become 1 % and 3 %, respectively. (arxiv.org)
The U.S. National Aeronautics and Space Administration's Kepler mission, launched on March 6, 2009, uses transit photometry from space to achieve unprecedented sensitivity for small planets with orbital periods of up to two years and should discover whether planets analogous to Earth are common or rare. (britannica.com)
The Kepler photometry of the three stars with S index below 0.13 (KIC 2850378, KIC 11197517 and KIC 11241343) could be contaminated by background stars. (nature.com)