It is approximately 158 light years from Earth[1] and is a member of the Beta Pictoris Moving Group of stars that share a common motion through space.
[10] It forms a wide binary system with the star HD 181327[17] and has a substellar companion orbiting around it, named Eta Telescopii B.
[7] Observations with the MIRI spectometer aboard the James Webb Space Telescope show that the disk is axisymmetrical and possibly misaligned with the companion Eta Telescopii B.
[7] Eta Telescopii is in fact a triple star system; further away, separated by 7',[17] is the common proper motion companion HD 181327, a yellow-white main sequence star of spectral type F6V and apparent magnitude 7.0,[18] which is separated from Eta Telescopii from 7' in the sky and has its own debris disk.
[19][20] In 1998, imaging with the Hubble Space Telescope revealed a 12th magnitude object around 4" distant from Eta Telescopii, and calculated to be a brown dwarf of spectral type M7V or M8V with a surface temperature of around 2600 K.[4] This companion, named Eta Telescopii B, takes 1,100 years to complete an orbit and has an orbital distance that varies from 71 AU in the periapsis, to 213 AU in the apoapsis.