Recent numerical integrations, however, suggest that
stable planetary
orbits exist: within three AUs (four AUs for retrograde
orbits) of either Alpha Centauri A or B
in the plane of the binary's
orbit; only as far as 0.23 AU for 90 - degree inclined
orbits; and
beyond 70 AUs for planets circling both stars (Weigert and Holman, 1997).