Infrared CMD for the stars selected as astrometric members of UBC 103. Blue circles are the 2MASS counterparts of objects that fall in the cluster sequence and the two objects that we interpret as cluster supergiants. The orange circles are the counterparts to the objects that present redder colours in the Gaia CMD. They are also clearly displaced to redder colours, as well as to brighter magnitudes, in this plot, indicating a separate population.