The object has 3 parts: a central core, a small halo and then a larger halo that measures about 1.5 degrees - 3 moon diameters.
I think it may be a venting rocket or similar. It "turns" as it crosses the sky in a way similar to watching the ISS as it approaches and recedes.
Any suggestions would be welcome.
Pic 1-5 taken at 9:15, 9:17, 9:32, 9:51 and 9:56PM AEST respectively.
The images are crops of a larger field. The bright star top right is Canopus.
First Pic; RA = 6:00, DEC = -62.5
Last Pic; RA = 7:45, DEC = -62.8
Velocity = Approx 18 Deg/Hour, bearing 100 deg E by SSE
Camera: Nikon D7000 with Nikkor 35mm F1.8. 20 Secs @ 8,000 ISO.