Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_59 (year_named VARCHAR, diameter__km_ VARCHAR)
### Question:
What was the year when the diameter was 729 km?
### Answer:
SELECT year_named FROM table_name_59 WHERE diameter__km_ = 729