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We present a new calibration of the J-band absolute magnitude of the JAGBmethod based on thermally pulsing AGB stars that are members of Milky Way openclusters, having distances and reddenings, independently compiled and publishedby Marigo et al (2022). 17 of these photometrically-selected J-Branch AGB starsgive M_J = -6.40 mag with a scatter of +/-0.40 mag, and a sigma on the mean of+/-0.10 mag. Combining the Milky Way field carbon star calibration of Lee etal. (2021) with this determination gives a weighted average of M_J(MW) = -6.19+/- 0.04 mag (error on the mean). This value is statistically indistinguishablefrom the value determined for this population of distance indicators in the LMCand SMC, giving further evidence that JAGB stars are extremely reliabledistance indicators of high luminosity and universal applicability. Combiningthe zero points for JAGB stars in these three systems, a value of M_J = -6.20+/- 0.01 (stat) +/- 0.04 (sys) mag becomes our best current estimate of theJAGB zero point and its associated errors. Finally, we note that no evidence isfound for any statistically significant dependence of this zero point onmetallicity.

Milky Way Zero-Point Calibration of the JAGB Method: Using Thermally Pulsing AGB Stars in Galactic Open Clusters