I did try another example, and had much better results:
Using this lightcurve i estimated the exoplanet radius in the usual way:
The result I obtained was
Not too bad since the accepted value is 1.079 ± 0.033. The difference could be just trying to estimate D from the laptop screen.
I’ve been checking coordinates using SIMBAD.
Whether this is because the data is better or because I’m getting better at using HOPS I’m not sure.