Strange Light Effect over HK

[lepremier]

Anyone notice a strange light effect in the sky over Hong Kong/S. China last night? On the way up to Beijing and just passing over Hong Kong when we noticed quite a bright diffused sort of white light appear, a bit like the moon coming out from behind the clouds, except no moon and no high clouds. It got brighter before changing into a misty sort of trail behind a white point of light. The trail also reminded me a bit of a shock wave behind a high speed object. I would say very high altitude traveling from west to east at 1215 utc ( 2000 HK time). I don’t think it was re-entry debris as there was no burn up and it seemed to be at a constant, very high level. Maybe a comet but the very sharp point of white light at the front seemed to rule that out.
Any ideas guys….?