Assertion: asteroid's discoverer | /r/CapableOf | place upper limit of 1,800 km
Facets:
value: on its diameter
type: LOCATION
value: in 2004
type: TEMPORAL
Source sentences:
text: In 2004, the discoverers placed an upper limit of 1,800 km on its diameter, but by 2007 this was revised downward to less than 1,600 km after observation by the Spitzer Space Telescope.