What is the diameter in km of the feature named Colette Patera? 
CREATE TABLE table_16799784_8 (diameter__km_ VARCHAR, name VARCHAR)
SELECT diameter__km_ FROM table_16799784_8 WHERE name = "Colette Patera"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_16799784_8 (diameter__km_ VARCHAR, name VARCHAR) Question: What is the diameter in km of the feature named Colette Patera?  [/INST] SELECT diameter__km_ FROM table_16799784_8 WHERE name = "Colette Patera" </s>