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Another definition from wikipedia (Astrometry)

Tuesday 4 March 2008 by flo
is the branch of astronomy that relates to precise measurements and explanations of the positions and movements of stars and other celestial bodies. Although once thought of as an esoteric field with little useful application for the future, the information obtained by astrometric measurements (...)

Introduction, general background (Microlensing)

Tuesday 4 March 2008 by flo
The discovery of extrasolar planets is arguably the most exciting development in astrophysics during the past decade, rivaled only by the discovery of the cosmic acceleration. The unexpected variety of giant exo-planets, some very close to their stars, many with high orbital eccentricity, has (...)

Definition from wikipedia (Radial Velocities)

Tuesday 4 March 2008 by flo
Radial velocity is the velocity of an object in the direction of the line of sight (i.e. its speed straight towards you, or away from you). The light of an object with a substantial radial velocity will be subject to Doppler effect, so the frequency of the light decreases for receding objects (...)

Microlensing today (Microlensing)

Tuesday 4 March 2008 by flo
Already with ground-based observations, the microlensing technique is sensitive to cool planets with masses down to that of the Earth orbiting 0.1-1 Mo stars, the most common stars of our Galaxy, in orbits of 1-10 AU. Currently, over 700 microlensing events towards the Galactic Bulge are (...)

New article (Transits)

Tuesday 4 March 2008 by flo
The word "transit" refers to cases where the nearer object appears considerably smaller in apparent size than the more distant object. Cases where the nearer object appears larger and completely hides the more distant object are known as occultations. Cases where one object moves into the (...)