CREATE TABLE table_11365 ("NGC number" FLOAT, "Object type" TEXT, "Constellation" TEXT, "Right ascension  (  J2000  ) " TEXT, "Declination  (  J2000  ) " TEXT)

Name the object type with an NGC number more than 6638 and right ascensions being 18h25m37.8s
SELECT "Object type" FROM table_11365 WHERE "NGC number" > '6638' AND "Right ascension ( J2000 )" = '18h25m37.8s'
SELECT "Object type" FROM "table_11365" WHERE "NGC number" > '6638' AND "Right ascension ( J2000 )" = '18h25m37.8s'