The
Probing Lensing Anomalies NETwork (
PLANET) collaboration coordinates a network of
telescopes to rapidly sample
photometric measurements of the magnification of stars in the
galactic bulge undergoing
gravitational microlensing by intervening foreground
stars (or other compact massive objects). This network consists of five 1m-class
optical telescopes distributed in
longitude around the
southern hemisphere in order to perform quasi-continuous round-the-clock precision monitoring. On a target-of-opportunity basis, less frequent
spectroscopic measurements complement the rapid photometry for selected prime targets. Since 2005, PLANET performs a common microlensing campaign with
RoboNet-1.0, a network of UK-operated 2.0m robotic telescopes.