Noted on Radar an unidentified flying object inbound towards the East coast of Australia, currently radar paints show a long basically rectangular object, maintaining a constant heading at approx 100 knots ground speed, heading 270 mag towards Port Macquarie. At present heading and ground speed object is expected to cross the coast at 1400 UTC, pilots are asked to keep a lookout for this object and report to Sydney Approach if sighted with a description, heading and est speed