The CMD submitted in the previous fortnight shows members of NGC 4755 – an open cluster in Crux. The stars were selected in the SIMBAD database as they all belong to the cluster – all at more or less the same distance, and this simplifies working with apparent mag- nitudes that are available in the database.

Note: NGC 4755: Color-Magnitude Diagrams (CMDs) and Zero-Age Main Sequence Luminosities