  Open clusters are ideal targets for searching for transiting Hot Jupiters.
They provide a relatively large concentration of stars on the sky and cluster
members have similar metallicities, ages and distances. Fainter cluster members
are likely to show deeper transit signatures, helping to offset sky noise
contributions. A survey of open clusters will then help to characterise the Hot
Jupiter fraction of main sequence stars, and how this may depend on primordial
metallicity and stellar age. We present results from 11 nights of observations
of the open cluster NGC 7789 with the WFC camera on the INT telescope in La
Palma. From 684 epochs, we obtained lightcurves and B-V colours for ~25600
stars, with ~2400 stars with better than 1% precision. We expect to detect ~1
transiting Hot Jupiter in our sample assuming that 1% of stars host a Hot
Jupiter companion.
