user: Question: What was the diameter of the feature found in 1997?
Columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named', 'Name origin']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Fornax Rupes', '30.3N', '201.1E', '729.0', 1985.0, 'Roman goddess of hearth and baking of bread.']
SQL:

assistant: SELECT "Diameter (km)" FROM "Table" WHERE "Year named" = 1997.0;