Thanks to the high time resolution of ULTRACAM and the large aperture of the William Herschel Telescope, astronomers recorded the most accurate chord ever obtained for an occultation by a Trans-Neptunian Object (TNO), with a length of 415 ± 1 km. This is a lower limit to the size of (119951) 2002 KX14 assuming it has a spherical shape. [ Video on Vimeo A stellar eclipse by 2002KX14 from Lightcurve Films ].

More information:

"One of Most Accurate Measurements of the Size of a Trans-Neptunian Object from a Stellar Occultation", ING web news release.