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Was it a point source that you were observing red/green? If so it was likely Canopus as it was at approx. 141 deg. Az. and 17 deg. Alt. at 22:30 Perth time. (Not sure if my Stellarium app compensated for DST). In any case at some point in the evening Canopus approx. matched your coordinates of 135 deg. Az. and 15 Alt.
The red/green was likely the refraction of different wavelengths of the light from Canopus in the lower part of our atmosphere.
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