Tell me the right ascension for open cluster and NGC number more than 2547
CREATE TABLE "2501_2600" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text,
  "apparent_magnitude" real
);
SELECT "right_ascension_j2000" FROM "2501_2600" WHERE "object_type"='open cluster' AND "ngc_number">2547;