There was something very similar about a year ago around northern Victoria. Quite a few of us Airline crew had reported it to Melbourne centre during the afternoon. If we were at FL400, the abnormally large white 'light' had to be at least four times higher. ATC were suggesting it was a NASA research balloon! It was too large to be a star, too bright to define and appeared stationary at a very high altitude.
Just saying
Last edited by hoss; 7th Jun 2016 at 13:27.