CREATE TABLE table_name_61 (ngc_number INTEGER, object_type VARCHAR(255), right_ascension___j2000__ VARCHAR(255))
Which NGC number has an Object type of open cluster, and a Right ascension (J2000) of 06h01m06s?
    
SQL: SELECT MAX(ngc_number) FROM table_name_61 WHERE object_type = "open cluster" AND right_ascension___j2000__ = "06h01m06s"