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CONTEXT. 2MASS is the reference survey in the NIR part of the spectrum givenits whole-sky coverage, large dynamic range, and proven calibration uniformity.However, previous studies disagree in the value of the zero points (ZPs) forits three bands JHK at the hundredth of a magnitude level. The disagreementshould become more noticeable now that Gaia provides whole-sky opticalphotometry calibrated below that level. AIMS. We want to establish the value ofthe 2MASS ZPs based on NICMOS/HST spectrophotometry of the CALSPEC standardstars and test it with the help of Gaia DR2 parallaxes. METHODS. We havecomputed the synthetic JHK photometry for a sample of stars using the HSTCALSPEC spectroscopic standards and compared it with their 2MASS magnitudes toevaluate the ZPs. We have tested our results by analysing a sample of FGKdwarfs with excellent 2MASS photometry and accurate Gaia DR2 parallaxes.}RESULTS. The Vega ZPs for 2MASS J, H, and K are found to be -0.025$\pm$0.005mag, 0.004$\pm$0.005 mag, and -0.015$\pm$0.005 mag, respectively. The analysisof the FGK sample indicates that the new ZPs are more accurate than previousones.

A reevaluation of the 2MASS zero points using CALSPEC spectrophotometry complemented with Gaia Data Release 2 parallaxes