CREATE TABLE table_46705 ("Name" CLOB, "Latitude" CLOB, "Longitude" CLOB, "Diameter  ( km ) " FLOAT, "Year named" FLOAT, "Name origin" CLOB)

What was the year when the diameter was 729 km?
SELECT "Year named" FROM table_46705 WHERE "Diameter (km)" = '729'
SELECT "Year named" FROM "table_46705" WHERE "Diameter (km)" = '729'