CREATE TABLE table_55300 ("NGC number" FLOAT, "Object type" TEXT, "Constellation" TEXT, "Right ascension  (  J2000  ) " TEXT, "Declination  (  J2000  ) " TEXT, "Apparent magnitude" FLOAT)

Tell me the right ascension for open cluster and NGC number more than 2547
SELECT "Right ascension ( J2000 )" FROM table_55300 WHERE "Object type" = 'open cluster' AND "NGC number" > '2547'
SELECT "Right ascension ( J2000 )" FROM "table_55300" WHERE "NGC number" > '2547' AND "Object type" = 'open cluster'