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We report the detection of high frequency variability in the black hole X-raytransient XTE J1650-500. A quasi-periodic oscillation (QPO) was found at 250 Hzduring a transition from the hard to the soft state. We also detected lesscoherent variability around 50 Hz, that disappeared when the 250 Hz QPO showedup. There are indications that when the energy spectrum hardened the QPOfrequency increased from ~110 Hz to ~270 Hz, although the observed frequenciesare also consistent with being 1:2:3 harmonics of each other. Interpreting the250 Hz as the orbital frequency at the innermost stable orbit around aSchwarzschild black hole leads to a mass estimate of 8.2 Msun. The spectralresults by Miller et al.(2002, ApJ, 570, L69), which suggest considerable blackhole spin, would imply a higher mass.Comment: Submitted to ApJ, 12 pages including 2 figure

High‐Frequency Quasi‐periodic Oscillations in the Black Hole X‐Ray Transient XTE J1650−500