He said he had been hosting a public outreach project at the observatory when the meteor appeared.
Mr Duggan said: "It was like a big flame coming down, very wide."
Train driver Andy Rosser also saw the light in the sky as he pulled in to Solihull station.
"I caught a glimpse of a very fast moving, very bright light with maybe a little green look to it and I thought: 'What the hell was that?'," he said.
Mr Fildes said the colour of the fireball meteor suggested it was probably made of iron, and was about the size of a human fist.
There were reports on Twitter of the fast-moving green/white object being seen from East Anglia to Scotland.