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_75 (eccentricity VARCHAR, semimajor_axis___au__ VARCHAR)
### Question:
What is the eccentricity when the semimajor axis is 20 au?
### Answer:
SELECT eccentricity FROM table_name_75 WHERE semimajor_axis___au__ = "20 au"