Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_55300 ( "NGC number" real, "Object type" text, "Constellation" text, "Right ascension ( J2000 )" text, "Declination ( J2000 )" text, "Apparent magnitude" real )

### Question ###
Tell me the right ascension for open cluster and NGC number more than 2547

### Accurate SQL ###

SELECT "Right ascension ( J2000 )" FROM table_55300 WHERE "Object type" = 'open cluster' AND "NGC number" > '2547'