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Deep imaging was performed with the Subaru Telescope on Mauna Kea centered on the position of the KBO (24952) 1997 QJ4 on 2 half-nights during October 2002. A deep search for evidence of a dust coma was conducted which could be indicative of cometary activity down to a limit of mV = 31 mag arcsec−2. No coma was detected, and from this sensitive upper limits on dust production can be set at Q < 0.01 kg s−1. Brightness variations consistent with rotational modulation were seen, implying a period of rotation longer than 4 hrs, with a range > 0.3 mag corresponding to a minimum projected axis ratio of 1:1.3.