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We present the discovery of a binary millisecond pulsar (MSP), PSRJ2322$-$2650, found in the Southern section of the High Time ResolutionUniverse survey. This system contains a 3.5-ms pulsar with a $\sim10^{-3}$M$_{\odot}$ companion in a 7.75-hour circular orbit. Follow-up observations atthe Parkes and Lovell telescopes have led to precise measurements of theastrometric and spin parameters, including the period derivative, timingparallax, and proper motion. PSR J2322$-$2650 has a parallax of $4.4\pm1.2$mas, and is thus at an inferred distance of $230^{+90}_{-50}$ pc, making thissystem a candidate for optical studies. We have detected a source of$R\approx26.4$ mag at the radio position in a single $R$-band observation withthe Keck Telescope, and this is consistent with the blackbody temperature wewould expect from the companion if it fills its Roche lobe. The intrinsicperiod derivative of PSR J2322$-$2650 is among the lowest known,$4.4(4)\times10^{-22}$ s s$^{-1}$, implying a low surface magnetic fieldstrength, $4.0(4)\times10^7$ G. Its mean radio flux density of 160 $\mu$Jycombined with the distance implies that its radio luminosity is the lowest evermeasured, $0.008(5)$ mJy kpc$^2$. The inferred population of these systems inthe Galaxy may be very significant, suggesting that this is a common MSPevolutionary path.

PSR J2322$-$2650 -- A low-luminosity millisecond pulsar with a planetary-mass companion