CREATE TABLE table_21077 ("Name" TEXT, "Latitude" TEXT, "Longitude" TEXT, "Diameter  ( km ) " TEXT, "Year named" FLOAT, "Name origin" TEXT)

How many numbers are listed under diameter with a lattitude of 5.0n?
SELECT COUNT("Diameter (km)") FROM table_21077 WHERE "Latitude" = '5.0N'
SELECT COUNT("Diameter (km)") FROM "table_21077" WHERE "Latitude" = '5.0N'