Green Fireballs???

[Ninurta]

...On topic, the radiant given in the link is for midnight, GMT. Because of the rotation of the Earth,
the radiant would be significantly farther east at 17:45 to 17:55 GMT, meaning that if the object
came from "up" instead of "left", it was not likely a Quadrantid...

Would you say -in your opinion, that it was something illuminated due to entering the atmosphere?

Well, it could have been incandescent from friction heat due to falling through the atmosphere, or it may possibly have been lit by the rays of the setting sun. Depending on how high up it was in the atmo, combined with how far below the horizon the sun was, sunshine could have still been hitting it. I've see airplanes at 30,000 feet or so lit up like christmas trees by a sun I could no longer see as it had sunk below the horizon from my earth-bound vantage point. If you light a ball with a flash light, you can see that there are areas on it's surface that are still in shadow while something an inch or two above the surface at the same point will still be illuminated by the torch's light.

So it could have been extraterrestrial and being lit by friction, or it could have been terrestrial but high enough to still be lit by the sun. I've also seen the International Space Station (280 miles or so up) in bright sunshine as it cruised across the sky while below I was in blackest night.

Another possibility is that your object was self-luminous...