Stu
Give this a try.
Mt Stromlo Exploratory
Cotter Road
Mt Stromlo
Canberra
Australian Capital Territory 2611
Ph: (02) 6249 0232
Also, try googling "Canberra Astronomical Society".
Look for the name John Howard. Yes, that's right... J Howard. - the astronomer, not the little bloke with the bushy eyebrows!