Observations with the infrared ORGANIZATION@1 show a diameter of NUMBER@1 to be NUMBER@2 km -LRB- NUMBER@3 miles -RRB- plus or minus NUMBER@4 km -LRB- NUMBER@5 to NUMBER@6 km in diameter -RRB- , or a NUMBER@7 km radius .

Sightings with the ORGANIZATION@1 show that it 's diameter is about NUMBER@2 km -LRB- NUMBER@3 miles -RRB- plus or minus NUMBER@4 km -LRB- NUMBER@5 to NUMBER@6 km in diameter -RRB- , or a NUMBER@7 km radius .
