 It is a periodic microvariable with an amplitude of 0.0055 magnitude and a frequency of 0.36118 cycles per day.With the supply of hydrogen exhausted at its core, the star has expanded and cooled, now having 31 times the Sun's girth.It is radiating 338.5 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,420 K.

Eta Gruis has a magnitude 11.5 visual companion located at an angular separation of along a position angle of 187°, as of 2012.