Yep I would say a satellite, quiet a few passing over at 11pm from my location in melbourne according to heavens-above.
could be this one:
H-2A ROCKET BODY3.423:01:2510°NW
23:05:4542°NNE23:26:2610°E
or
BREEZE-M DEB (TANK)4.522:55:5510°NNW
23:05:5837°NNE23:05:5837°NNE