CREATE TABLE table_72806 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " TEXT, "Year named" FLOAT, "Name origin" TEXT)

What was the diameter of the feature found in 1997?
SELECT "Diameter (km)" FROM table_72806 WHERE "Year named" = '1997'
SELECT "Diameter (km)" FROM "table_72806" WHERE "Year named" = '1997'