From Jeff Poplin – NASA revises (upward) preliminary estimates: http://www.nasa.gov/mission_pages/asteroids/news/asteroid20130215.html UMSF forum pages about the event: http://www.unmannedspaceflight.com/index.php?showtopic=5524&st=285 Lots of good comments from knowledgeable folks… Interesting link used by one poster to estimate impact effects: http://impact.ese.ic.ac.uk/ImpactEffects/ Phil Plait’s update: http://www.slate.com/blogs/bad_astronomy/2013/02/15/russian_meteorite_fragment_may_have_fallen_in_frozen_lake.html Meteosat-9 images showing contrail shadow on ground! First pics I’ve seen of possible fragments. http://74.mvd.ru/news/item/845855/ (need…