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We report the discovery of PSR~J2251$-$3711, a radio pulsar with a spinperiod of 12.1 seconds, the second longest currently known. Its timingparameters imply a characteristic age of 15 Myr, a surface magnetic field of$1.3 \times 10^{13}$~G and a spin-down luminosity of $2.9 \times10^{29}~\mathrm{erg~s}^{-1}$. Its dispersion measure of12.12(1)~$\mathrm{pc}~\mathrm{cm}^{-3}$ leads to distance estimates of 0.5 and1.3 kpc according to the NE2001 and YMW16 Galactic free electron densitymodels, respectively. Some of its single pulses show an uninterrupted 180degree sweep of the phase-resolved polarization position angle, with an S-shapereminiscent of the rotating vector model prediction. However, the fact thatthis sweep occurs at different phases from one pulse to another is remarkableand without straightforward explanation. Although PSR~J2251$-$3711 lies in theregion of the $P-\dot{P}$ parameter space occupied by the X-ray IsolatedNeutron Stars (XINS), there is no evidence for an X-ray counterpart in ourSwift XRT observation; this places a 99\%-confidence upper bound on itsunabsorbed bolometric thermal luminosity of $1.1 \times 10^{31}~(d /1~\mathrm{kpc})^2~\mathrm{erg/s}$ for an assumed temperature of 85 eV, where$d$ is the distance to the pulsar. Further observations are needed to determinewhether it is a rotation-powered pulsar with a true age of at least severalMyr, or a much younger object such as an XINS or a recently cooled magnetar.Extreme specimens like PSR J2251$-$3711 help bridge populations in theso-called neutron star zoo in an attempt to understand their origins andevolution.

The SUrvey for Pulsars and Extragalactic Radio Bursts IV: Discovery and polarimetry of a 12.1-second radio pulsar