Meteor shower particles that are quickly blown away by solar radiation pressure). Recently, Peter Jenniskens has argued that most of our short-period meteor showers are not from the normal water vapor drag of active comets, but the product of infrequent disintegrations, when large chunks break off a mostly dormant comet. Examples are the Quadrantids and Geminids, which originated from a breakup of asteroid-looking objects, 2003 EH1 and 3200 Phaethon, respectively, about 500 and 1000 years ago. The fragments tend to fall apart quickly into dust, sand, and pebbles, and spread out along the orbit of the comet to form a dense meteoroid
December Hydrids (December 4–15), and the Ursids (December 17-to December 25/26, peaking around December 22). "This list does not necessarily imply either official status or general observance." Last Week of November: November 25 – December 1 First Sunday: December 2 Fourth Sunday before Christmas Day: December 2 First Monday in December and following 7 days: December 3-9 First Friday: December 7 Sunday two weeks before Christmas: December 9 Second Monday: December 10 December 15, unless the date falls on a Sunday, then December 16: December 15 Second-final Sunday before Christmas Day: December 16 Thursday before Christmas: December 20 Winter Solstice: December