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Studies of star formation rely heavily on observations in the near-infrared,but they typically need information from other wavelengths for interpretation.We show that we can infer distances and estimate the membership of youngstellar objects for young clusters independently using (ground-based)near-infrared, $J$, $H,$ and $K_S$ broadband data alone. We also show that wecan estimate a lower limit for the fraction of sources with $2.2~\mu$m excessemission with a sensitivity comparable to that of mid-infrared space data, butwith better resolution and fewer biases. Finally, we show that the typicalmethods for inferring masses from these data may produce substantiallyunreliable results. This method is applied to the young, massive cluster RCW38, for which we estimate a distance of 1.5 kpc and a $K_S$-band excessfraction larger than 60\%.

Hidden power of near-infrared data for the study of young clusters: Illustrative case of RCW 38