Table: alpan_fluctus_2
Columns: name
latitude
longitude
diameter_km
year_named

Question: What's the longitude named zipaltonal fluctus in 1997 with a diameter smaller than 490?
SQL: SELECT "longitude" FROM alpan_fluctus_2 WHERE "year_named" = 1997 AND "diameter_km" < 490 AND "name" = 'zipaltonal fluctus'

Question: What's the diameter of kaiwan fluctus?
SQL: SELECT "diameter_km" FROM alpan_fluctus_2 WHERE "name" = 'kaiwan fluctus'