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We report optical observations of the millisecond pulsar binary system PSRJ1622-0315 with the Lulin 1m telescope in Taiwan and the Lijiang 2.4m telescopein China between 2019 and 2021. The companion of the pulsar, which is of V~19mag, showed ellipsoidal-distorted orbital variations in its light curves. Thebest-fit model to the light curves, with the binary code PHOEBE, gives acompanion mass of 0.122+/-0.006 M_sun. This places PSR J1622-0315 in thespider-system subclass. We compared the properties of PSR J1622-0315 with otherspider pulsar binaries for the scalings between the spin-down luminosityderived for the pulsar, irradiation luminosity of the companion, and X-rayluminosity of the binary. We find that pulsar irradiation in PSR J1622-0315 isinsignificant and the irradiation luminosity of the transitional millisecondpulsars PSR J1023+0038 and PSR J1227-4853 are the highest among the redbacksystems.

A light redback companion of PSR J1622-0315 and irradiation power in spider systems