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We present the first optical photometry of the counterpart to the candidateintermediate polar RX J0153.3+7446. This reveals an optical pulse period of2333s +/- 5s. Reanalysis of the previously published ROSAT X-ray data revealsthat the true X-ray pulse period is probably 1974s +/- 30s, rather than the1414 s previously reported. Given that the previously noted orbital period ofthe system is 3.94 h, we are able to identify the X-ray pulse period with thewhite dwarf spin period and the optical pulse period with the rotation periodof the white dwarf in the binary reference frame, as commonly seen in otherintermediate polars. We thus confirm that RX J0153.3+7446 is indeed a typicalintermediate polar.Comment: 4 pages, submitted to A&A Letter

The periods of the intermediate polar RX J0153.3+7446