MOA-2010-BLG-477L is a K-type star with about 0.67 times the mass of the Sun, in the main-sequence phase of its stellar evolution. Overall, very little is known about this star, with very poor constrains on its projected characteristics due to One extrasolar planet, with a mass greater than that of Jupiter, has been discovered orbiting the star at a distance of roughly 2 AU. The planet was detected by means of microlensing, where gravitational lensing as the planet and its host star pass in front of a background star causes a temporary flare in the amount of light observed, allowing the planet's existence to be known.
Planetary system
The history of the detection of the planet, MOA-2010-BLG-477 L b, dates back to the year 2010. In that year, a microlensing alert event occurred, before the planet was confirmed conclusively, and was detected independently by the MOA and OGLE collaborations. Following the original microlensing event, astronomers predicted another microlensing peak, which was observed by numerous groups using a wide array of telescopes. One of these telescopes was located in Antarctica, and made the first microlensing detections from that continent; however, the data collected there were too crude to be included in the analysis which eventually confirmed the planet.
MOA-2010-BLG-477 L b is the only planet which has been detected orbiting MOA-2010-BLG-477 L. Little is known about this planet, with the only characteristics known about this system are the mass of the planet and its projected separation from its host star.