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We present time-resolved photometry of the optical counterpart to the blackhole candidate Swift J1753.5-0127, which has remained in the low/hard X-raystate and bright at optical/IR wavelengths since its discovery in 2005. At thetime of our observations Swift J1753.5-0127 does not show a decay trend butremains stable at R=16.45 with a night to night variability of ~0.05 mag. TheR-band light curves, taken from 2007 June 3 to August 31, are not sinusoidal,but exhibit a complex morphology with remarkable changes in shape andamplitude. The best period determination is 3.2443+-0.0010 hours. Thisphotometric period is likely a superhump period, slightly larger than theorbital period. Therefore, Swift J1753.5-0127 is the black hole candidate withthe shortest orbital period observed to date. Our estimation of the distance iscomparable to values previously published and likely places Swift J1753.5-0127in the Galactic halo.

Swift J1753.5-0127: The Black Hole Candidate with the shortest orbital period