  "MagAO" is the adaptive optics instrument at the Magellan Clay telescope at
Las Campanas Observatory, Chile. MagAO has a 585-actuator adaptive secondary
mirror and 1000-Hz pyramid wavefront sensor, operating on natural guide stars
from $R$-magnitudes of -1 to 15. MagAO has been in on-sky operation for 166
nights since installation in 2012. MagAO's unique capabilities are simultaneous
imaging in the visible and infrared with VisAO and Clio, excellent performance
at an excellent site, and a lean operations model. Science results from MagAO
include the first ground-based CCD image of an exoplanet, demonstration of the
first accreting protoplanets, discovery of a new wide-orbit exoplanet, and the
first empirical bolometric luminosity of an exoplanet. We describe the status,
report the AO performance, and summarize the science results. New developments
reported here include color corrections on red guide stars for the wavefront
sensor, a new field stop stage to facilitate VisAO imaging of extended sources;
and eyepiece observing at the visible-light diffraction limit of a 6.5-m
telescope. We also discuss a recent hose failure that led to a glycol coolant
leak, and the recovery of the adaptive secondary mirror (ASM) after this recent
(Feb.\ 2016) incident.
