On November 6, 2010, three teams of astronomers using three different telescopes tracking the occultation of a 17th - magnitude star in the north - central part of Constellation Cetus by Eris revealed preliminary results indicating that the dwarf planet may be smaller in diameter than Pluto after all, based on the unexpectedly short times of
occultation reported.
From studying the way the starlight dimmed, Marc Buie of Lowell Observatory in Flagstaff, Arizona, and James Elliot of the Massachusetts Institute of Technology in Cambridge,
reported 14 August that Pluto's atmospheric temperature has dropped some 20 kelvin since the last
occultation in 1988.