CREATE TABLE table_name_16 (year_named INT, name VARCHAR, diameter__km_ VARCHAR)

What's the average year for the name aida-wedo dorsa with a diameter less than 450?
SELECT AVG(year_named) FROM table_name_16 WHERE name = "aida-wedo dorsa" AND diameter__km_ < 450
SELECT AVG("year_named") FROM "table_name_16" WHERE "aida-wedo dorsa" = "name" AND "diameter__km_" < 450