Which NGC number has an Object type of open cluster, and a Right ascension (J2000) of 06h01m06s?
CREATE TABLE "2101_2200" (
  "ngc_number" real,
  "object_type" text,
  "constellation" text,
  "right_ascension_j2000" text,
  "declination_j2000" text
);
SELECT MAX("ngc_number") FROM "2101_2200" WHERE "object_type"='open cluster' AND "right_ascension_j2000"='06h01m06s';