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We present the fundamental parameters of HR 2582, a high-mass red giant starwhose evolutionary state is a mystery. We used the CHARA Array interferometerto directly measure the star's limb-darkened angular diameter (1.006+/-0.020mas) and combined our measurement with parallax and photometry from theliterature to calculate its physical radius (35.76+/-5.31 R_Sun), luminosity(517.8+/-17.5 L_Sun), bolometric flux (14.8+/-0.5 e-8 erg s-1 cm-2) andeffective temperature (4577+/-60 K). We then determined the star's mass(5.6+/-1.7 M_Sun) using our new values with stellar oscillation results fromBaudin et al. Finally, using the Yonsei-Yale evolutionary models, we estimatedHR 2582's age to be 165 +20/-15 Myr. While our measurements do not provide theprecision required to definitively state where the star is in its evolution, itremains an excellent test case for evaluating stellar interior models.

Characterization of the Red Giant HR 2582 Using the CHARA Array