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Comparison with the mass of ⁹Li leads to an estimated mass excess of 32.3 ± 2 MeV (1955AJ61). Analysis of a single star attributed to β-decay of ⁹C and subsequent breakup into p + 2α yields Q > 15.4 MeV, mass excess > 30.2 MeV (1956SW77). Stability against ⁸B + p requires a mass excess < 32.9 MeV. Two reactions leading to ⁹C which have not been reported are ⁷Be(³He, n)⁹C (Q_m = -7) and ¹²C(γ, 3n)⁹C (Q_m = -54).