Combining the measurements of direction and elevation and the entrance angle should yield the trajectory of the fireball in the earth atmosphere. We now may conclude the fireball appeared about 100 to 150 kilometres west of Egmond aan zee. This little town at the Dutch coast is located about 40 kilometres south of Den Helder. Many colours have been reported. But also green and blue is reported.
Some observers report a dust-trail.
As the meteor appeared in daylight hours this is hard to tell. Most Dutch observers do NOT report any fragmentation. But an UA aircraft crew reports a rain of flashes. Also from BBC-text one may deduce observers have seen fragmentation. This should be clarified.