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We report new lightcurves and phase functions for nine Jupiter-family comets(JFCs). They were observed in the period 2004-2015 with various groundtelescopes as part of the Survey of Ensemble Physical Properties of CometaryNuclei (SEPPCoN) as well as during devoted observing campaigns. We add to thisa review of the properties of 35 JFCs with previously published rotationproperties.  The photometric time-series were obtained in Bessel R, Harris R and SDSS r'filters and were absolutely calibrated using stars from the Pan-STARRS survey.This specially-developed method allowed us to combine data sets taken atdifferent epochs and instruments with absolute-calibration uncertainty down to0.02 mag. We used the resulting time series to improve the rotation periods forcomets 14P/Wolf, 47P/Ashbrook-Jackson, 94P/Russell, and 110P/Hartley 3 and todetermine the rotation rates of comets 93P/Lovas and 162P/Siding-Spring for thefirst time. In addition to this, we determined the phase functions for seven ofthe examined comets and derived geometric albedos for eight of them.  We confirm the known cut-off in bulk densities at $\sim$0.6 g$\mathrm{cm^{-3}}$ if JFCs are strengthless. Using the model of Davidsson(2001) for prolate ellipsoids with typical density and elongations, we concludethat none of the known JFCs require tensile strength larger than 10-25 Pa toremain stable against rotational instabilities. We find evidence for anincreasing linear phase function coefficient with increasing geometric albedo.The median linear phase function coefficient for JFCs is 0.046 mag/deg and themedian geometric albedo is 4.2 per cent.

Rotation of Cometary Nuclei: New Lightcurves and an Update of the Ensemble Properties of Jupiter-Family Comets