Question: What is the diameter of the feature with longitude 8.0E?
SQL: SELECT "Diameter (km)" FROM "1-16799784-13" WHERE "Longitude" = '8.0E';

Question: What feature is at latitude 23.9S?
SQL: SELECT "Name" FROM "1-16799784-13" WHERE "Latitude" = '23.9S';

Question: When was  the most recently named feature named?
SQL: SELECT MAX("Year named") FROM "1-16799784-13";