The word "occultation" refers to the phenomenon when one celestial object such as a star or planet appears to be hidden or obscured by another object, usually when they pass in front of each other from our perspective on Earth. Full definition
Continued observations of stellar occultations of Pluto will show us whether its atmosphere freezes out. (space.com)
Elliot crater recognises James Elliot (1943 - 2011), an MIT researcher who pioneered the use of stellar occultations to study the Solar System — leading to discoveries such as the rings of Uranus and the first detection of Pluto's thin atmosphere. (sciencedaily.com)
[7] The rings of Uranus, and the ring arcs around Neptune, were found in a similar way during occultations in 1977 and 1984, respectively. (sciencedaily.com)