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The energetic, eclipsing millisecond pulsar J1816+4510 was recentlydiscovered in a low-frequency radio survey with the Green Bank Telescope. Withan orbital period of 8.7 hr and minimum companion mass of 0.16 Msun it appearsto belong to an increasingly important class of pulsars that are ablating theirlow-mass companions. We report the discovery of the gamma-ray counterpart tothis pulsar, and present a likely optical/ultraviolet counterpart as well.Using the radio ephemeris we detect pulsations in the unclassified gamma-raysource 2FGL J1816.5+4511, implying an efficiency of ~25% in converting thepulsar's spin-down luminosity into gamma-rays and adding PSR J1816+4510 to thelarge number of millisecond pulsars detected by Fermi. The likely optical/UVcounterpart was identified through position coincidence (<0.1") and unusualcolors. Assuming that it is the companion, with R=18.27+/-0.03 mag andeffective temperature >15,000 K it would be among the brightest and hottest oflow-mass pulsar companions, and appears qualitatively different from othereclipsing pulsar systems. In particular, current data suggest that it is afactor of two larger than most white dwarfs of its mass, but a factor of foursmaller than its Roche lobe. We discuss possible reasons for its hightemperature and odd size, and suggest that it recently underwent a violentepisode of mass loss. Regardless of origin, its brightness and the relativeunimportance of irradiation make it an ideal target for a mass, and hence aneutron star mass, determination.

Discovery of the Optical/Ultraviolet/Gamma-ray Counterpart to the Eclipsing Millisecond Pulsar J1816+4510