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According to the WDS catalog, zeta Orionis has components Aa,Ab, B and C.
Aa and Ab (mags 2 and 4) are spectroscopic, too close for visual observation.
B is mag 3.7, separation only 2.4". As Malcolm stated, you will need at least 200x and good seeing to split it from the primary.
Component C is given as mag 9.55 almost 60" away and is not particularly bright.
If you are after a really nice multiple star in Orion check out sigma (σ) Orionis. It is just off Alnitak (ζ) in the belt of Orion. It actually consists of five stars of magnitudes 6.3, 6.6, AB, 8.8 with separations of 41”, 13” and 11” from the primary AB. They should be easily separated at a magnification of 100x or more. The primary AB of magnitudes 4 and 5.3 is too close to split, components only 0.3” apart.
Regards, Rob.
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