 "Burnham's Celestial Handbook" lists the entire nebula as 2174/2175 and does not mention the star cluster.The NGC Project (working from the original descriptive notes) assigns NGC 2174 to the prominent knot at J2000 , and NGC 2175 to the entire nebula, and by extension to the star cluster.Simbad uses NGC 2174 for the nebula and NGC 2175 for the star cluster.