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This paper reports on the validation and mass measurement of K2-263b, asub-Neptune orbiting a quiet G9V star. Using K2 data from campaigns C5 and C16,we find this planet to have a period of $50.818947\pm 0.000094$ days and aradius of $2.41\pm0.12$ R$_{\oplus}$. We followed this system with HARPS-N toobtain 67 precise radial velocities. A combined fit of the transit and radialvelocity data reveals that K2-263b has a mass of $14.8\pm3.1$ M$_{\oplus}$. Itsbulk density ($5.7_{-1.4}^{+1.6}$ g cm$^{-3}$) implies that this planet has asignificant envelope of water or other volatiles around a rocky core.EPIC211682544b likely formed in a similar way as the cores of the four giantplanets in our own Solar System, but for some reason, did not accrete much gas.The planetary mass was confirmed by an independent Gaussian process-based fitto both the radial velocities and the spectroscopic activity indicators.K2-263b belongs to only a handful of confirmed K2 exoplanets with periodslonger than 40 days. It is among the longest periods for a small planet with aprecisely determined mass using radial velocities.

K2-263b: A 50-day period sub-Neptune with a mass measurement using HARPS-N