Good to see the Dragon X safely docked on the International Space Station. A first for private business.
You may recall the first Dragon-X test flight a few years ago, which resulted in some "UFO" reports over Australia due to the unusual spiral effect of the final stage degassing.
http://www.space.com/15885-spacex-dragon-capsule-station-astronauts.htmlThere is quite a bright pass for the ISS on Thursday May 31. It should be as bright as Venus. If you're in Sydney, start looking at 6:30pm in the South South West. If you can see any stars, you won't miss it. In Melbourne, it will be closer to the South and will be even Brighter (mag -3.2).
For Brisbane, that pass is too low on the horizon. Try the 2nd June at 6:20-6:23pm. That's almost overhead, stating in the SW and finishing to the East.
For Adelaide, try the 1st June at 5:46pm until 5:49pm, about 30 minutes after sunset. That's a great overhead pass.
For Perth, try the 1st June at 6:43-6:49pm. Look SW to SE.
You can track the ISS or any other visible satellites yourself. Just Google Online satellite tracking. Heavens Above is a good site (free registration)