CREATE TABLE table_58344 ("NGC number" FLOAT, "Object type" TEXT, "Constellation" TEXT, "Right ascension  (  J2000  ) " TEXT, "Declination  (  J2000  ) " TEXT)

Which NGC number has an Object type of open cluster, and a Right ascension (J2000) of 06h01m06s?
SELECT MAX("NGC number") FROM table_58344 WHERE "Object type" = 'open cluster' AND "Right ascension ( J2000 )" = '06h01m06s'
SELECT MAX("NGC number") FROM "table_58344" WHERE "Object type" = 'open cluster' AND "Right ascension ( J2000 )" = '06h01m06s'