1999ApJ...517L..97V

The small Antlia-Sextans clustering of galaxies is located at a distance of only 1.36 Mpc from the Sun and 1.72 Mpc from the adopted barycenter of the Local Group. The latter value is significantly greater than the radius of the zero-velocity surface of the Local Group that, for an assumed age of 14 Gyr, has R₀=1.18±0.15 Mpc. This, together with the observation that the members of the Ant-Sex group have a mean redshift of 114±12 km.s^–1 relative to the centroid of the Local Group, suggests that the Antlia-Sextans group is not bound to our Local Group and that it is expanding with the Hubble flow. If this conclusion is correct, then Antlia-Sextans may be the nearest external clustering of galaxies. The total galactic population of the Ant-Sex group is ~(1)/(5) that of the Local Group. However, the integrated luminosity of Ant-Sex is 2 orders of magnitude lower than that of the Local Group.