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The calcium monohydroxide radical (CaOH) is an important astrophysicalmolecule relevant to cool stars and rocky exoplanets, amongst otherastronomical environments. Here, we present a consistent set of highly accuraterovibronic (rotation-vibration-electronic) energy levels for the five lowestelectronic states ($\tilde{X}\,^2\Sigma^+$, $\tilde{A}\,^2\Pi$,$\tilde{B}\,^2\Sigma^+$, $\tilde{C}\,^2\Delta$, $\tilde{D}\,^2\Sigma^+$) ofCaOH. A comprehensive analysis of the published spectroscopic literature onthis system has allowed 1955 energy levels to be determined from 3204rovibronic experimental transitions, all with unique quantum number labellingand measurement uncertainties. The dataset covers rotational excitation up to$J=62.5$ for molecular states below 29\,000~cm$^{-1}$. The analysis wasperformed using the MARVEL algorithm, which is a robust procedure based on thetheory of spectroscopic networks. The dataset provided will significantly aidfuture interstellar, circumstellar and atmospheric detections of CaOH, as wellas assisting in the design of efficient laser cooling schemes in ultracoldmolecule research and precision tests of fundamental physics.

MARVEL analysis of the measured high-resolution rovibronic spectra of the calcium monohydroxide radical (CaOH)