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We use two 4.5micron Spitzer (IRAC) maps of the NGC 1333 region taken overapprox. 7 yr interval to determine proper motions of its associated outflows.This is a first, successful attempt at obtaining proper motions of stellarsoutflow from Spitzer observations. For the outflow formed by the Herbig-Haroobjects HH7, 8 and 10, we find proper motions of approx. 9-13 km/s, which areconsistent with previously determined optical proper motions of these objects.We determine proper motions for a total of 8 outflows, ranging from approx. 10to 100 km/s. The derived proper motions show that out of these 8 outflows, 3have tangential velocities less or equal to 20 km/s. This result shows that alarge fraction of the observed outflows have low intrinsic velocities, and thatthe low proper motions are not merely a projection effect.

Proper Motions of Young Stellar Outflows in the Mid-Infrared with Spitzer (IRAC). I. The NGC 1333 region