Correction to your translation
<Un bolide de quelques dizaines de mètres de diamètre est passé à 120 000 kilomètres de nous le 14 juin.
A bolide several tens of kilometers in diameter passed 120,000 km ffrom us on the 14th of June.
Actually, the diameter was tens of meters, not tens of kilometers. If the sucker had been tens of kilometers and came that close, it would've been easier to detect and would've raised a lot more attention. After all, the "dino killer" asteroid was only believed to be about 10 kilometers in diameter.