![]() ![]() ![]() One of the main challenge is that the planet's pull on the star (astrometric signal) is very small and the position of the star on the sky therefore needs to be measured to very high precision. This webpage describes how both techniques could be realized on a a single space telescope. Most coronagraphs are intended to view the corona of the Sun, but a new class of conceptually similar instruments (called stellar coronagraphs to distinguish them from solar coronagraphs) are being used to find extrasolar planets around nearby stars." (Source: Wikipedia)īoth techniques are very useful to astronomy to identify and study exoplanets (planets around other stars): with a coronagraph, we can directly image planets and study them through spectroscopy (color information) with astrometry, we can measure the planet's gravitational pull on the star and therefore measure the planet's mass. "A coronagraph is a telescopic attachment designed to block out the direct light from a star so that nearby objects - which otherwise would be hidden in the star's bright glare - can be resolved. The information obtained by astrometric measurements provides information on the kinematics and physical origin of our Solar System and our Galaxy, the Milky Way." (Source: Wikipedia) " Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies. A Concept for high precision Astrometry with a Space Coronagraph What is this about ? ![]()
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