Word of the Week: Phase Angle
A measurement (from 0 to 180 degrees) of the angle between an observer (such as a spacecraft), the object being observed (such as a planet or asteroid), and a light source (such as the Sun).
OSIRIS-REx will observe asteroid Bennu from low and high phase angles in order to better understand how the asteroid’s surface reflects light.
Credit: University of Arizona
full (1887x1275) | thumbnail (150x150) | medium (300x203) | medium_large (640x433) | large (640x433) | banner-xm (427x240) | banner-sm (640x360) | banner-med (854x480) | banner-large (1024x576) | banner-full (1280x720)