[5] Its brightness varies from magnitude 5.89 to 7.07, making it occasionally bright enough to be faintly visible to the naked eye under very good observing conditions.

With a spectral classification M5IIIa, Tau4 Serpentis is a cool red giant star.

[11] Sometime between the years 1868 and 1877, John Ellard Gore discovered that the star's brightness varies.

[12] It is classified as a semiregular late-type variable, and its magnitude varies between +5.89 and +7.07 with a period of approximately 100 days.

[3] τ4 is unique among the stars with the Bayer designation τ Serpentis as being the only one with no HR catalog number.