What's the longitude for philae sulcus in 1997 with a diameter less than 1,575.0?
CREATE TABLE "sulci" (
  "name" text,
  "latitude" text,
  "longitude" text,
  "diameter" real,
  "year_named" real
);
SELECT "longitude" FROM "sulci" WHERE "diameter"<'1,575.0' AND "year_named"=1997 AND "name"='philae sulcus';