Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_41 (longitude VARCHAR, name VARCHAR, year_named VARCHAR, diameter__km_ VARCHAR)

### Question ###
What's the longitude named zipaltonal fluctus in 1997 with a diameter smaller than 490?

### Accurate SQL ###

SELECT longitude FROM table_name_41 WHERE year_named = 1997 AND diameter__km_ < 490 AND name = "zipaltonal fluctus"