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The recently discovered dwarf galaxy Perseus I appears to be associated withthe dominant plane of non-satellite galaxies in the Local Group (LG). Wepredict its velocity dispersion and those of the other isolated dSphs Cetus andTucana to be 6.5, 8.2, and 5.5 km/s, respectively. The NGC 3109 association,including the recently discovered dwarf galaxy Leo P, aligns with the dwarfgalaxy structures in the LG such that all known nearby non-satellite galaxiesin the northern Galactic hemisphere lie in a common thin plane (rms height 53kpc; diameter 1.2 Mpc). This plane has an orientation similar to the preferredorbital plane of the Milky Way (MW) satellites in the vast polar structure.Five of seven of these northern galaxies were identified as possible backsplashobjects, even though only about one is expected from cosmological simulations.This may pose a problem, or instead the search for local backsplash galaxiesmight be identifying ancient tidal dwarf galaxies expelled in a past majorgalaxy encounter. The NGC 3109 association supports the notion that materialpreferentially falls towards the MW from the Galactic south and recedes towardsthe north, as if the MW were moving through a stream of dwarf galaxies.

Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures