CREATE TABLE table_21084 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " TEXT, "Year named" FLOAT, "Name origin" TEXT)

What is the diameter of the feature with longitude 8.0e?
SELECT "Diameter (km)" FROM table_21084 WHERE "Longitude" = '8.0E'
SELECT "Diameter (km)" FROM "table_21084" WHERE "Longitude" = '8.0E'