Question: Name the object type with an NGC number more than 6638 and right ascensions being 18h25m37.8s
SQL: SELECT "Object type" FROM "2-11051842-7" WHERE "NGC number" > 6638.0 AND "Right ascension ( J2000 )" = '18h25m37.8s';

Question: Tell me the constellation which has a right ascension of 18h17m41.1s
SQL: SELECT "Constellation" FROM "2-11051842-7" WHERE "Right ascension ( J2000 )" = '18h17m41.1s';