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We present high speed optical photometric observations made using the NTT andULTRACAM of the optical counterpart of 3XMMJ051034.6--670353, which wasrecently identified as an X-ray source showing a modulation on a period of 23.6min. Although the optical counterpart is faint (g=21.4), we find that theu'g'r' light curves show a periodic modulation on a period which is consistentwith the X-ray period. We also obtained three low resolution spectra of3XMMJ051034.6--670353 using the Gemini South Telescope and GMOS. There is noevidence for strong emission lines in the optical spectrum of3XMMJ051034.6--670353. We compare and contrast the optical and X-rayobservations of 3XMMJ051034.6--670353 with the ultra compact binaries HM Cncand V407 Vul. We find we can identify a distribution of binary masses in whichstable direct impact accretion can occur.

Detection of a 23.6 min periodic modulation in the optical counterpart of 3XMMJ051034.6--670353