Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Name', 'Latitude', 'Longitude', 'Diameter (km)', 'Year named']

### Response:
SELECT Longitude FROM table WHERE Year named = 1997 AND Diameter (km) < 490 AND Name = zipaltonal fluctus