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The new 8.4m LBT adaptive secondary AO system, with its novel pyramidwavefront sensor, was used to produce very high Strehl (75% at 2.16 microns)near infrared narrowband (Br gamma: 2.16 microns and [FeII]: 1.64 microns)images of 47 young (~1 Myr) Orion Trapezium theta1 Ori cluster members. Theinner ~41x53" of the cluster was imaged at spatial resolutions of ~0.050" (at1.64 microns). A combination of high spatial resolution and high S/N yieldedrelative binary positions to ~0.5 mas accuracies. Including previous speckledata, we analyse a 15 year baseline of high-resolution observations of thiscluster. We are now sensitive to relative proper motions of just ~0.3 mas/yr(0.6 km/s at 450 pc) this is a ~7x improvement in orbital velocity accuracycompared to previous efforts. We now detect clear orbital motions in the theta1Ori B2/B3 system of 4.9+/-0.3 km/s and 7.2+/-0.8 km/s in the theta1 Ori A1/A2system (with correlations of PA vs. time at >99% confidence). All five membersof the theta1 Ori B system appear likely as a gravitationally bound"mini-cluster". The very lowest mass member of the theta1 Ori B system (B4;mass ~0.2 Msun) has, for the first time, a clearly detected motion (at4.3+/-2.0 km/s; correlation=99.7%) w.r.t B1. However, B4 is most likely in anlong-term unstable (non-hierarchical) orbit and may "soon" be ejected from this"mini-cluster". This "ejection" process could play a major role in theformation of low mass stars and brown dwarfs.

High Resolution Images of Orbital Motion in the Orion Trapezium Cluster with the LBT Adaptive Optics System