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In a search of the unidentified Fermi gamma-ray source 3FGL J1417.5-4402 withthe Parkes radio telescope, we discovered PSR J1417-4402, a 2.66 ms pulsarhaving the same 5.4 day orbital period as the optical and X-ray binaryidentified by Strader et al. The existence of radio pulsations implies that theneutron star is currently not accreting. Substantial outflows from thecompanion render the radio pulsar undetectable for more than half of the orbit,and may contribute to the observed Halpha emission. Our initial pulsarobservations, together with the optically inferred orbit and inclination, implya mass ratio of 0.171+/-0.002, a companion mass of M_2=0.33+/-0.03 Msun, and aneutron star mass in the range 1.77<M_1<2.13 Msun. However, there remains adiscrepancy between the distance of 4.4 kpc inferred from the opticalproperties of the companion and the smaller radio dispersion measure distanceof 1.6 kpc. The smaller distance would reduce the inferred Roche-lobe fillingfactor, increase the inferred inclination angle, and decrease the masses. As awide binary, PSR J1417-4402 differs from the radio-eclipsing black widow andredback pulsars being discovered in large numbers by Fermi. It is probably asystem that began mass transfer onto the neutron star after the companion starleft the main sequence. The companion should end its evolution as a He whitedwarf in a 6-20 day orbit, i.e., as a typical binary millisecond pulsarcompanion.

Discovery of a millisecond pulsar in the 5.4 day binary 3FGL J1417.5-4402: observing the late phase of pulsar recycling